From e356e9e1b783c0e991114f024eff165d01f8c8e6 Mon Sep 17 00:00:00 2001
From: Jim McDonald <Jim@mcdee.net>
Date: Tue, 31 Oct 2023 13:17:44 +0000
Subject: [PATCH] Update dependencies.

---
 CHANGELOG.md                                  |   3 +
 beacon/chaininfo.go                           |  27 ++--
 cmd/account/derive/output.go                  |   3 +-
 cmd/attester/duties/process.go                |  11 +-
 cmd/attester/inclusion/output.go              |   3 +-
 cmd/attester/inclusion/process.go             |  42 +++--
 cmd/block/analyze/output.go                   |  15 +-
 cmd/block/analyze/process.go                  |  94 ++++++++---
 cmd/block/info/output.go                      |  39 +++--
 cmd/block/info/process.go                     |  78 +++++----
 cmd/chain/eth1votes/process.go                |  12 +-
 cmd/chain/queues/process.go                   |   7 +-
 cmd/chain/time/output.go                      |  15 +-
 .../signedcontributionandproof/process.go     |  31 ++--
 cmd/chaininfo.go                              |  27 ++--
 cmd/chainspec.go                              |  25 +--
 cmd/chainstatus.go                            |  13 +-
 cmd/epoch/summary/process.go                  |  33 ++--
 cmd/exitverify.go                             |  10 +-
 cmd/nodeinfo.go                               |   8 +-
 cmd/proposer/duties/process.go                |  12 +-
 cmd/slot/time/process.go                      |   7 +-
 cmd/synccommittee/inclusion/output.go         |   9 +-
 cmd/synccommittee/inclusion/process.go        |  12 +-
 cmd/synccommittee/members/process.go          |   7 +-
 cmd/validator/credentials/get/output.go       |   3 +-
 cmd/validator/credentials/set/process.go      |   2 +-
 cmd/validator/depositdata/process.go          |   2 +-
 cmd/validator/duties/process.go               |  44 ++---
 cmd/validator/expectation/command.go          |   8 +-
 cmd/validator/expectation/process.go          |  21 +--
 cmd/validator/summary/process.go              |  30 ++--
 cmd/validator/withdrawal/process.go           |  20 ++-
 cmd/validator/yield/process.go                |  11 +-
 cmd/version.go                                |   2 +-
 cmd/wallet/sharedexport/output.go             |   4 +-
 go.mod                                        |  69 ++++----
 go.sum                                        | 151 ++++++++++--------
 services/chaintime/standard/parameters.go     |   2 +-
 services/chaintime/standard/service.go        |  24 +--
 testing/mock/eth2client.go                    |  23 ++-
 util/beaconheadercache.go                     |   7 +-
 util/networks.go                              |  11 +-
 util/networks_test.go                         |  10 +-
 util/validator.go                             |   8 +-
 util/validators.go                            |  20 ++-
 46 files changed, 614 insertions(+), 401 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index b538aa6..ae9b02e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+1.34.0:
+  - update dependencies
+
 1.33.2:
   - fix windows build
 
diff --git a/beacon/chaininfo.go b/beacon/chaininfo.go
index 7f96179..af544f4 100644
--- a/beacon/chaininfo.go
+++ b/beacon/chaininfo.go
@@ -22,6 +22,7 @@ import (
 	"strings"
 
 	consensusclient "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	"github.com/attestantio/go-eth2-client/spec/phase0"
 	"github.com/pkg/errors"
 	"github.com/wealdtech/ethdo/services/chaintime"
@@ -57,7 +58,7 @@ type chainInfoVersionJSON struct {
 // MarshalJSON implements json.Marshaler.
 func (c *ChainInfo) MarshalJSON() ([]byte, error) {
 	return json.Marshal(&chainInfoJSON{
-		Version:                        fmt.Sprintf("%d", c.Version),
+		Version:                        strconv.FormatUint(c.Version, 10),
 		Validators:                     c.Validators,
 		GenesisValidatorsRoot:          fmt.Sprintf("%#x", c.GenesisValidatorsRoot),
 		Epoch:                          fmt.Sprintf("%d", c.Epoch),
@@ -241,12 +242,12 @@ func ObtainChainInfoFromNode(ctx context.Context,
 	}
 
 	// Obtain validators.
-	validators, err := consensusClient.(consensusclient.ValidatorsProvider).Validators(ctx, "head", nil)
+	validatorsResponse, err := consensusClient.(consensusclient.ValidatorsProvider).Validators(ctx, &api.ValidatorsOpts{State: "head"})
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to obtain validators")
 	}
 
-	for _, validator := range validators {
+	for _, validator := range validatorsResponse.Data {
 		res.Validators = append(res.Validators, &ValidatorInfo{
 			Index:                 validator.Index,
 			Pubkey:                validator.Validator.PublicKey,
@@ -256,18 +257,18 @@ func ObtainChainInfoFromNode(ctx context.Context,
 	}
 
 	// Genesis validators root obtained from beacon node.
-	genesis, err := consensusClient.(consensusclient.GenesisProvider).Genesis(ctx)
+	genesisResponse, err := consensusClient.(consensusclient.GenesisProvider).Genesis(ctx)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to obtain genesis information")
 	}
-	res.GenesisValidatorsRoot = genesis.GenesisValidatorsRoot
+	res.GenesisValidatorsRoot = genesisResponse.Data.GenesisValidatorsRoot
 
 	// Fetch the genesis fork version from the specification.
-	spec, err := consensusClient.(consensusclient.SpecProvider).Spec(ctx)
+	specResponse, err := consensusClient.(consensusclient.SpecProvider).Spec(ctx)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to obtain spec")
 	}
-	tmp, exists := spec["GENESIS_FORK_VERSION"]
+	tmp, exists := specResponse.Data["GENESIS_FORK_VERSION"]
 	if !exists {
 		return nil, errors.New("genesis fork version not known by chain")
 	}
@@ -278,23 +279,23 @@ func ObtainChainInfoFromNode(ctx context.Context,
 	}
 
 	// Fetch the current fork version from the fork schedule.
-	forkSchedule, err := consensusClient.(consensusclient.ForkScheduleProvider).ForkSchedule(ctx)
+	forkScheduleResponse, err := consensusClient.(consensusclient.ForkScheduleProvider).ForkSchedule(ctx)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to obtain fork schedule")
 	}
-	for i := range forkSchedule {
-		if forkSchedule[i].Epoch <= res.Epoch {
-			res.CurrentForkVersion = forkSchedule[i].CurrentVersion
+	for i := range forkScheduleResponse.Data {
+		if forkScheduleResponse.Data[i].Epoch <= res.Epoch {
+			res.CurrentForkVersion = forkScheduleResponse.Data[i].CurrentVersion
 		}
 	}
 
-	blsToExecutionChangeDomainType, exists := spec["DOMAIN_BLS_TO_EXECUTION_CHANGE"].(phase0.DomainType)
+	blsToExecutionChangeDomainType, exists := specResponse.Data["DOMAIN_BLS_TO_EXECUTION_CHANGE"].(phase0.DomainType)
 	if !exists {
 		return nil, errors.New("failed to obtain DOMAIN_BLS_TO_EXECUTION_CHANGE")
 	}
 	copy(res.BLSToExecutionChangeDomainType[:], blsToExecutionChangeDomainType[:])
 
-	voluntaryExitDomainType, exists := spec["DOMAIN_VOLUNTARY_EXIT"].(phase0.DomainType)
+	voluntaryExitDomainType, exists := specResponse.Data["DOMAIN_VOLUNTARY_EXIT"].(phase0.DomainType)
 	if !exists {
 		return nil, errors.New("failed to obtain DOMAIN_VOLUNTARY_EXIT")
 	}
diff --git a/cmd/account/derive/output.go b/cmd/account/derive/output.go
index b6ecf84..3a835d8 100644
--- a/cmd/account/derive/output.go
+++ b/cmd/account/derive/output.go
@@ -15,6 +15,7 @@ package accountderive
 
 import (
 	"context"
+	"encoding/hex"
 	"encoding/json"
 	"fmt"
 	"os"
@@ -84,7 +85,7 @@ func outputKeystore(_ context.Context, data *dataOut) (string, error) {
 	}
 	ks := make(map[string]interface{})
 	ks["uuid"] = uuid.String()
-	ks["pubkey"] = fmt.Sprintf("%x", data.key.PublicKey().Marshal())
+	ks["pubkey"] = hex.EncodeToString(data.key.PublicKey().Marshal())
 	ks["version"] = 4
 	ks["path"] = data.path
 	ks["crypto"] = crypto
diff --git a/cmd/attester/duties/process.go b/cmd/attester/duties/process.go
index 1549cf0..6919e45 100644
--- a/cmd/attester/duties/process.go
+++ b/cmd/attester/duties/process.go
@@ -17,7 +17,8 @@ import (
 	"context"
 
 	eth2client "github.com/attestantio/go-eth2-client"
-	api "github.com/attestantio/go-eth2-client/api/v1"
+	"github.com/attestantio/go-eth2-client/api"
+	apiv1 "github.com/attestantio/go-eth2-client/api/v1"
 	spec "github.com/attestantio/go-eth2-client/spec/phase0"
 	"github.com/pkg/errors"
 	"github.com/wealdtech/ethdo/util"
@@ -49,12 +50,16 @@ func process(ctx context.Context, data *dataIn) (*dataOut, error) {
 	return results, nil
 }
 
-func duty(ctx context.Context, eth2Client eth2client.Service, validator *api.Validator, epoch spec.Epoch) (*api.AttesterDuty, error) {
+func duty(ctx context.Context, eth2Client eth2client.Service, validator *apiv1.Validator, epoch spec.Epoch) (*apiv1.AttesterDuty, error) {
 	// Find the attesting slot for the given epoch.
-	duties, err := eth2Client.(eth2client.AttesterDutiesProvider).AttesterDuties(ctx, epoch, []spec.ValidatorIndex{validator.Index})
+	dutiesResponse, err := eth2Client.(eth2client.AttesterDutiesProvider).AttesterDuties(ctx, &api.AttesterDutiesOpts{
+		Epoch:   epoch,
+		Indices: []spec.ValidatorIndex{validator.Index},
+	})
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to obtain attester duties")
 	}
+	duties := dutiesResponse.Data
 
 	if len(duties) == 0 {
 		return nil, errors.New("validator does not have duty for that epoch")
diff --git a/cmd/attester/inclusion/output.go b/cmd/attester/inclusion/output.go
index 64c7380..c81aa76 100644
--- a/cmd/attester/inclusion/output.go
+++ b/cmd/attester/inclusion/output.go
@@ -16,6 +16,7 @@ package attesterinclusion
 import (
 	"context"
 	"fmt"
+	"strconv"
 	"strings"
 
 	"github.com/attestantio/go-eth2-client/spec/phase0"
@@ -49,7 +50,7 @@ func output(_ context.Context, data *dataOut) (string, error) {
 			buf.WriteString("Attestation included in block ")
 			buf.WriteString(fmt.Sprintf("%d", data.slot))
 			buf.WriteString(", index ")
-			buf.WriteString(fmt.Sprintf("%d", data.attestationIndex))
+			buf.WriteString(strconv.FormatUint(data.attestationIndex, 10))
 			if data.verbose {
 				buf.WriteString("\nInclusion delay: ")
 				buf.WriteString(fmt.Sprintf("%d", data.inclusionDelay))
diff --git a/cmd/attester/inclusion/process.go b/cmd/attester/inclusion/process.go
index 3ddc0de..308fcfa 100644
--- a/cmd/attester/inclusion/process.go
+++ b/cmd/attester/inclusion/process.go
@@ -19,7 +19,8 @@ import (
 	"fmt"
 
 	eth2client "github.com/attestantio/go-eth2-client"
-	api "github.com/attestantio/go-eth2-client/api/v1"
+	"github.com/attestantio/go-eth2-client/api"
+	apiv1 "github.com/attestantio/go-eth2-client/api/v1"
 	"github.com/attestantio/go-eth2-client/spec/phase0"
 	"github.com/pkg/errors"
 	standardchaintime "github.com/wealdtech/ethdo/services/chaintime/standard"
@@ -61,14 +62,17 @@ func process(ctx context.Context, data *dataIn) (*dataOut, error) {
 	startSlot := duty.Slot + 1
 	endSlot := startSlot + 32
 	for slot := startSlot; slot < endSlot; slot++ {
-		signedBlock, err := data.eth2Client.(eth2client.SignedBeaconBlockProvider).SignedBeaconBlock(ctx, fmt.Sprintf("%d", slot))
+		blockResponse, err := data.eth2Client.(eth2client.SignedBeaconBlockProvider).SignedBeaconBlock(ctx, &api.SignedBeaconBlockOpts{
+			Block: fmt.Sprintf("%d", slot),
+		})
 		if err != nil {
 			return nil, errors.Wrap(err, "failed to obtain block")
 		}
-		if signedBlock == nil {
+		block := blockResponse.Data
+		if block == nil {
 			continue
 		}
-		blockSlot, err := signedBlock.Slot()
+		blockSlot, err := block.Slot()
 		if err != nil {
 			return nil, errors.Wrap(err, "failed to obtain block slot")
 		}
@@ -78,7 +82,7 @@ func process(ctx context.Context, data *dataIn) (*dataOut, error) {
 		if data.debug {
 			fmt.Printf("Fetched block for slot %d\n", slot)
 		}
-		attestations, err := signedBlock.Attestations()
+		attestations, err := block.Attestations()
 		if err != nil {
 			return nil, errors.Wrap(err, "failed to obtain block attestations")
 		}
@@ -121,21 +125,23 @@ func process(ctx context.Context, data *dataIn) (*dataOut, error) {
 func calcHeadCorrect(ctx context.Context, data *dataIn, attestation *phase0.Attestation) (bool, error) {
 	slot := attestation.Data.Slot
 	for {
-		header, err := data.eth2Client.(eth2client.BeaconBlockHeadersProvider).BeaconBlockHeader(ctx, fmt.Sprintf("%d", slot))
+		response, err := data.eth2Client.(eth2client.BeaconBlockHeadersProvider).BeaconBlockHeader(ctx, &api.BeaconBlockHeaderOpts{
+			Block: fmt.Sprintf("%d", slot),
+		})
 		if err != nil {
 			return false, err
 		}
-		if header == nil {
+		if response.Data == nil {
 			// No block.
 			slot--
 			continue
 		}
-		if !header.Canonical {
+		if !response.Data.Canonical {
 			// Not canonical.
 			slot--
 			continue
 		}
-		return bytes.Equal(header.Root[:], attestation.Data.BeaconBlockRoot[:]), nil
+		return bytes.Equal(response.Data.Root[:], attestation.Data.BeaconBlockRoot[:]), nil
 	}
 }
 
@@ -143,30 +149,36 @@ func calcTargetCorrect(ctx context.Context, data *dataIn, attestation *phase0.At
 	// Start with first slot of the target epoch.
 	slot := data.chainTime.FirstSlotOfEpoch(attestation.Data.Target.Epoch)
 	for {
-		header, err := data.eth2Client.(eth2client.BeaconBlockHeadersProvider).BeaconBlockHeader(ctx, fmt.Sprintf("%d", slot))
+		response, err := data.eth2Client.(eth2client.BeaconBlockHeadersProvider).BeaconBlockHeader(ctx, &api.BeaconBlockHeaderOpts{
+			Block: fmt.Sprintf("%d", slot),
+		})
 		if err != nil {
 			return false, err
 		}
-		if header == nil {
+		if response.Data == nil {
 			// No block.
 			slot--
 			continue
 		}
-		if !header.Canonical {
+		if !response.Data.Canonical {
 			// Not canonical.
 			slot--
 			continue
 		}
-		return bytes.Equal(header.Root[:], attestation.Data.Target.Root[:]), nil
+		return bytes.Equal(response.Data.Root[:], attestation.Data.Target.Root[:]), nil
 	}
 }
 
-func duty(ctx context.Context, eth2Client eth2client.Service, validator *api.Validator, epoch phase0.Epoch) (*api.AttesterDuty, error) {
+func duty(ctx context.Context, eth2Client eth2client.Service, validator *apiv1.Validator, epoch phase0.Epoch) (*apiv1.AttesterDuty, error) {
 	// Find the attesting slot for the given epoch.
-	duties, err := eth2Client.(eth2client.AttesterDutiesProvider).AttesterDuties(ctx, epoch, []phase0.ValidatorIndex{validator.Index})
+	dutiesResponse, err := eth2Client.(eth2client.AttesterDutiesProvider).AttesterDuties(ctx, &api.AttesterDutiesOpts{
+		Epoch:   epoch,
+		Indices: []phase0.ValidatorIndex{validator.Index},
+	})
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to obtain attester duties")
 	}
+	duties := dutiesResponse.Data
 
 	if len(duties) == 0 {
 		return nil, errors.New("validator does not have duty for that epoch")
diff --git a/cmd/block/analyze/output.go b/cmd/block/analyze/output.go
index 048016c..96e06c2 100644
--- a/cmd/block/analyze/output.go
+++ b/cmd/block/analyze/output.go
@@ -17,6 +17,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"strconv"
 	"strings"
 )
 
@@ -82,26 +83,26 @@ func (c *command) outputTxt(_ context.Context) (string, error) {
 	for i, attestation := range c.analysis.Attestations {
 		if c.verbose {
 			builder.WriteString("Attestation ")
-			builder.WriteString(fmt.Sprintf("%d", i))
+			builder.WriteString(strconv.Itoa(i))
 			builder.WriteString(": ")
 			builder.WriteString("distance ")
-			builder.WriteString(fmt.Sprintf("%d", attestation.Distance))
+			builder.WriteString(strconv.Itoa(attestation.Distance))
 			builder.WriteString(", ")
 
 			if attestation.Duplicate != nil {
 				builder.WriteString("duplicate of attestation ")
-				builder.WriteString(fmt.Sprintf("%d", attestation.Duplicate.Index))
+				builder.WriteString(strconv.Itoa(attestation.Duplicate.Index))
 				builder.WriteString(" in block ")
 				builder.WriteString(fmt.Sprintf("%d", attestation.Duplicate.Block))
 				builder.WriteString("\n")
 				continue
 			}
 
-			builder.WriteString(fmt.Sprintf("%d", attestation.NewVotes))
+			builder.WriteString(strconv.Itoa(attestation.NewVotes))
 			builder.WriteString("/")
-			builder.WriteString(fmt.Sprintf("%d", attestation.Votes))
+			builder.WriteString(strconv.Itoa(attestation.Votes))
 			builder.WriteString("/")
-			builder.WriteString(fmt.Sprintf("%d", attestation.PossibleVotes))
+			builder.WriteString(strconv.Itoa(attestation.PossibleVotes))
 			builder.WriteString(" new/total/possible votes")
 			if attestation.NewVotes == 0 {
 				builder.WriteString("\n")
@@ -137,7 +138,7 @@ func (c *command) outputTxt(_ context.Context) (string, error) {
 	if c.analysis.SyncCommitee.Contributions > 0 {
 		if c.verbose {
 			builder.WriteString("Sync committee contributions: ")
-			builder.WriteString(fmt.Sprintf("%d", c.analysis.SyncCommitee.Contributions))
+			builder.WriteString(strconv.Itoa(c.analysis.SyncCommitee.Contributions))
 			builder.WriteString(" contributions, score ")
 			builder.WriteString(fmt.Sprintf("%0.3f", c.analysis.SyncCommitee.Score))
 			builder.WriteString(", value ")
diff --git a/cmd/block/analyze/process.go b/cmd/block/analyze/process.go
index 00af8a0..41a4d21 100644
--- a/cmd/block/analyze/process.go
+++ b/cmd/block/analyze/process.go
@@ -19,6 +19,7 @@ import (
 	"fmt"
 
 	eth2client "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	"github.com/attestantio/go-eth2-client/spec"
 	"github.com/attestantio/go-eth2-client/spec/phase0"
 	"github.com/pkg/errors"
@@ -33,13 +34,17 @@ func (c *command) process(ctx context.Context) error {
 		return err
 	}
 
-	block, err := c.blocksProvider.SignedBeaconBlock(ctx, c.blockID)
+	blockResponse, err := c.blocksProvider.SignedBeaconBlock(ctx, &api.SignedBeaconBlockOpts{
+		Block: c.blockID,
+	})
 	if err != nil {
+		var apiError *api.Error
+		if errors.As(err, &apiError) && apiError.StatusCode == 404 {
+			return errors.New("empty beacon block")
+		}
 		return errors.Wrap(err, "failed to obtain beacon block")
 	}
-	if block == nil {
-		return errors.New("empty beacon block")
-	}
+	block := blockResponse.Data
 
 	slot, err := block.Slot()
 	if err != nil {
@@ -145,7 +150,7 @@ func (c *command) analyzeAttestations(ctx context.Context, block *spec.Versioned
 			}
 
 			// Calculate head timely.
-			analysis.HeadTimely = attestation.Data.Slot == slot-1
+			analysis.HeadTimely = analysis.HeadCorrect && attestation.Data.Slot == slot-1
 
 			// Calculate source timely.
 			analysis.SourceTimely = attestation.Data.Slot >= slot-5
@@ -157,7 +162,11 @@ func (c *command) analyzeAttestations(ctx context.Context, block *spec.Versioned
 			}
 
 			// Calculate target timely.
-			analysis.TargetTimely = attestation.Data.Slot >= slot-32
+			if block.Version < spec.DataVersionDeneb {
+				analysis.TargetTimely = attestation.Data.Slot >= slot-32
+			} else {
+				analysis.TargetTimely = true
+			}
 		}
 
 		// Calculate score and value.
@@ -184,12 +193,30 @@ func (c *command) fetchParents(ctx context.Context, block *spec.VersionedSignedB
 	if err != nil {
 		return err
 	}
+	root, err := block.Deneb.HashTreeRoot()
+	if err != nil {
+		panic(err)
+	}
+	slot, err := block.Slot()
+	if err != nil {
+		panic(err)
+	}
+	if c.debug {
+		fmt.Printf("Parent root of %#x@%d is %#x\n", root, slot, parentRoot)
+	}
 
 	// Obtain the parent block.
-	parentBlock, err := c.blocksProvider.SignedBeaconBlock(ctx, fmt.Sprintf("%#x", parentRoot))
+	parentBlockResponse, err := c.blocksProvider.SignedBeaconBlock(ctx, &api.SignedBeaconBlockOpts{
+		Block: fmt.Sprintf("%#x", parentRoot),
+	})
 	if err != nil {
+		var apiError *api.Error
+		if errors.As(err, &apiError) && apiError.StatusCode == 404 {
+			return errors.New("empty beacon block")
+		}
 		return err
 	}
+	parentBlock := parentBlockResponse.Data
 	if parentBlock == nil {
 		return fmt.Errorf("unable to obtain parent block %s", parentBlock)
 	}
@@ -289,12 +316,12 @@ func (c *command) setup(ctx context.Context) error {
 		return errors.New("connection does not provide spec information")
 	}
 
-	spec, err := specProvider.Spec(ctx)
+	specResponse, err := specProvider.Spec(ctx)
 	if err != nil {
 		return errors.Wrap(err, "failed to obtain spec")
 	}
 
-	tmp, exists := spec["TIMELY_SOURCE_WEIGHT"]
+	tmp, exists := specResponse.Data["TIMELY_SOURCE_WEIGHT"]
 	if !exists {
 		// Set a default value based on the Altair spec.
 		tmp = uint64(14)
@@ -305,7 +332,7 @@ func (c *command) setup(ctx context.Context) error {
 		return errors.New("TIMELY_SOURCE_WEIGHT of unexpected type")
 	}
 
-	tmp, exists = spec["TIMELY_TARGET_WEIGHT"]
+	tmp, exists = specResponse.Data["TIMELY_TARGET_WEIGHT"]
 	if !exists {
 		// Set a default value based on the Altair spec.
 		tmp = uint64(26)
@@ -315,7 +342,7 @@ func (c *command) setup(ctx context.Context) error {
 		return errors.New("TIMELY_TARGET_WEIGHT of unexpected type")
 	}
 
-	tmp, exists = spec["TIMELY_HEAD_WEIGHT"]
+	tmp, exists = specResponse.Data["TIMELY_HEAD_WEIGHT"]
 	if !exists {
 		// Set a default value based on the Altair spec.
 		tmp = uint64(14)
@@ -325,7 +352,7 @@ func (c *command) setup(ctx context.Context) error {
 		return errors.New("TIMELY_HEAD_WEIGHT of unexpected type")
 	}
 
-	tmp, exists = spec["SYNC_REWARD_WEIGHT"]
+	tmp, exists = specResponse.Data["SYNC_REWARD_WEIGHT"]
 	if !exists {
 		// Set a default value based on the Altair spec.
 		tmp = uint64(2)
@@ -335,7 +362,7 @@ func (c *command) setup(ctx context.Context) error {
 		return errors.New("SYNC_REWARD_WEIGHT of unexpected type")
 	}
 
-	tmp, exists = spec["PROPOSER_WEIGHT"]
+	tmp, exists = specResponse.Data["PROPOSER_WEIGHT"]
 	if !exists {
 		// Set a default value based on the Altair spec.
 		tmp = uint64(8)
@@ -345,7 +372,7 @@ func (c *command) setup(ctx context.Context) error {
 		return errors.New("PROPOSER_WEIGHT of unexpected type")
 	}
 
-	tmp, exists = spec["WEIGHT_DENOMINATOR"]
+	tmp, exists = specResponse.Data["WEIGHT_DENOMINATOR"]
 	if !exists {
 		// Set a default value based on the Altair spec.
 		tmp = uint64(64)
@@ -362,22 +389,31 @@ func (c *command) calcHeadCorrect(ctx context.Context, attestation *phase0.Attes
 	root, exists := c.headRoots[slot]
 	if !exists {
 		for {
-			header, err := c.blockHeadersProvider.BeaconBlockHeader(ctx, fmt.Sprintf("%d", slot))
+			response, err := c.blockHeadersProvider.BeaconBlockHeader(ctx, &api.BeaconBlockHeaderOpts{
+				Block: fmt.Sprintf("%d", slot),
+			})
 			if err != nil {
+				var apiError *api.Error
+				if errors.As(err, &apiError) && apiError.StatusCode == 404 {
+					if c.debug {
+						fmt.Printf("No block available for slot %d, assuming not in canonical chain", slot)
+					}
+					return false, nil
+				}
 				return false, err
 			}
-			if header == nil {
+			if response.Data == nil {
 				// No block.
 				slot--
 				continue
 			}
-			if !header.Canonical {
+			if !response.Data.Canonical {
 				// Not canonical.
 				slot--
 				continue
 			}
-			c.headRoots[attestation.Data.Slot] = header.Root
-			root = header.Root
+			c.headRoots[attestation.Data.Slot] = response.Data.Root
+			root = response.Data.Root
 			break
 		}
 	}
@@ -391,22 +427,30 @@ func (c *command) calcTargetCorrect(ctx context.Context, attestation *phase0.Att
 		// Start with first slot of the target epoch.
 		slot := c.chainTime.FirstSlotOfEpoch(attestation.Data.Target.Epoch)
 		for {
-			header, err := c.blockHeadersProvider.BeaconBlockHeader(ctx, fmt.Sprintf("%d", slot))
+			response, err := c.blockHeadersProvider.BeaconBlockHeader(ctx, &api.BeaconBlockHeaderOpts{
+				Block: fmt.Sprintf("%d", slot),
+			})
 			if err != nil {
-				return false, err
+				var apiError *api.Error
+				if errors.As(err, &apiError) && apiError.StatusCode == 404 {
+					if c.debug {
+						fmt.Printf("No block available for slot %d, assuming not in canonical chain", slot)
+					}
+					return false, nil
+				}
 			}
-			if header == nil {
+			if response.Data == nil {
 				// No block.
 				slot--
 				continue
 			}
-			if !header.Canonical {
+			if !response.Data.Canonical {
 				// Not canonical.
 				slot--
 				continue
 			}
-			c.targetRoots[attestation.Data.Slot] = header.Root
-			root = header.Root
+			c.targetRoots[attestation.Data.Slot] = response.Data.Root
+			root = response.Data.Root
 			break
 		}
 	}
diff --git a/cmd/block/info/output.go b/cmd/block/info/output.go
index 3592b9e..3f95be9 100644
--- a/cmd/block/info/output.go
+++ b/cmd/block/info/output.go
@@ -20,11 +20,13 @@ import (
 	"fmt"
 	"math/big"
 	"sort"
+	"strconv"
 	"strings"
 	"time"
 	"unicode/utf8"
 
 	eth2client "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	"github.com/attestantio/go-eth2-client/spec/altair"
 	"github.com/attestantio/go-eth2-client/spec/bellatrix"
 	"github.com/attestantio/go-eth2-client/spec/capella"
@@ -116,12 +118,14 @@ func outputBlockAttestations(ctx context.Context, eth2Client eth2client.Service,
 				// Fetch committees for this epoch if not already obtained.
 				committees, exists := validatorCommittees[att.Data.Slot]
 				if !exists {
-					beaconCommittees, err := beaconCommitteesProvider.BeaconCommittees(ctx, fmt.Sprintf("%d", att.Data.Slot))
+					response, err := beaconCommitteesProvider.BeaconCommittees(ctx, &api.BeaconCommitteesOpts{
+						State: fmt.Sprintf("%d", att.Data.Slot),
+					})
 					if err != nil {
 						// Failed to get it; create an empty committee to stop us continually attempting to re-fetch.
 						validatorCommittees[att.Data.Slot] = make(map[phase0.CommitteeIndex][]phase0.ValidatorIndex)
 					} else {
-						for _, beaconCommittee := range beaconCommittees {
+						for _, beaconCommittee := range response.Data {
 							if _, exists := validatorCommittees[beaconCommittee.Slot]; !exists {
 								validatorCommittees[beaconCommittee.Slot] = make(map[phase0.CommitteeIndex][]phase0.ValidatorIndex)
 							}
@@ -166,11 +170,14 @@ func outputBlockAttesterSlashings(ctx context.Context, eth2Client eth2client.Ser
 
 			res.WriteString(fmt.Sprintf("  %d:\n", i))
 			res.WriteString(fmt.Sprintln("    Slashed validators:"))
-			validators, err := eth2Client.(eth2client.ValidatorsProvider).Validators(ctx, "head", slashedIndices)
+			response, err := eth2Client.(eth2client.ValidatorsProvider).Validators(ctx, &api.ValidatorsOpts{
+				State:   "head",
+				Indices: slashedIndices,
+			})
 			if err != nil {
 				return "", errors.Wrap(err, "failed to obtain beacon committees")
 			}
-			for k, v := range validators {
+			for k, v := range response.Data {
 				res.WriteString(fmt.Sprintf("      %#x (%d)\n", v.Validator.PublicKey[:], k))
 			}
 
@@ -223,11 +230,14 @@ func outputBlockVoluntaryExits(ctx context.Context, eth2Client eth2client.Servic
 	if verbose {
 		for i, voluntaryExit := range voluntaryExits {
 			res.WriteString(fmt.Sprintf("  %d:\n", i))
-			validators, err := eth2Client.(eth2client.ValidatorsProvider).Validators(ctx, "head", []phase0.ValidatorIndex{voluntaryExit.Message.ValidatorIndex})
+			response, err := eth2Client.(eth2client.ValidatorsProvider).Validators(ctx, &api.ValidatorsOpts{
+				State:   "head",
+				Indices: []phase0.ValidatorIndex{voluntaryExit.Message.ValidatorIndex},
+			})
 			if err != nil {
 				res.WriteString(fmt.Sprintf("  Error: failed to obtain validators: %v\n", err))
 			} else {
-				res.WriteString(fmt.Sprintf("    Validator: %#x (%d)\n", validators[voluntaryExit.Message.ValidatorIndex].Validator.PublicKey, voluntaryExit.Message.ValidatorIndex))
+				res.WriteString(fmt.Sprintf("    Validator: %#x (%d)\n", response.Data[voluntaryExit.Message.ValidatorIndex].Validator.PublicKey, voluntaryExit.Message.ValidatorIndex))
 				res.WriteString(fmt.Sprintf("    Epoch: %d\n", voluntaryExit.Message.Epoch))
 			}
 		}
@@ -243,11 +253,14 @@ func outputBlockBLSToExecutionChanges(ctx context.Context, eth2Client eth2client
 	if verbose {
 		for i, op := range ops {
 			res.WriteString(fmt.Sprintf("  %d:\n", i))
-			validators, err := eth2Client.(eth2client.ValidatorsProvider).Validators(ctx, "head", []phase0.ValidatorIndex{op.Message.ValidatorIndex})
+			response, err := eth2Client.(eth2client.ValidatorsProvider).Validators(ctx, &api.ValidatorsOpts{
+				State:   "head",
+				Indices: []phase0.ValidatorIndex{op.Message.ValidatorIndex},
+			})
 			if err != nil {
 				res.WriteString(fmt.Sprintf("  Error: failed to obtain validators: %v\n", err))
 			} else {
-				res.WriteString(fmt.Sprintf("    Validator: %#x (%d)\n", validators[op.Message.ValidatorIndex].Validator.PublicKey, op.Message.ValidatorIndex))
+				res.WriteString(fmt.Sprintf("    Validator: %#x (%d)\n", response.Data[op.Message.ValidatorIndex].Validator.PublicKey, op.Message.ValidatorIndex))
 				res.WriteString(fmt.Sprintf("    BLS public key: %#x\n", op.Message.FromBLSPubkey))
 				res.WriteString(fmt.Sprintf("    Execution address: %s\n", op.Message.ToExecutionAddress.String()))
 			}
@@ -265,9 +278,9 @@ func outputBlockSyncAggregate(ctx context.Context, eth2Client eth2client.Service
 	if verbose {
 		specProvider, isProvider := eth2Client.(eth2client.SpecProvider)
 		if isProvider {
-			config, err := specProvider.Spec(ctx)
+			specResponse, err := specProvider.Spec(ctx)
 			if err == nil {
-				slotsPerEpoch := config["SLOTS_PER_EPOCH"].(uint64)
+				slotsPerEpoch := specResponse.Data["SLOTS_PER_EPOCH"].(uint64)
 
 				res.WriteString("  Contributions: ")
 				res.WriteString(bitvectorToString(syncAggregate.SyncCommitteeBits))
@@ -275,14 +288,16 @@ func outputBlockSyncAggregate(ctx context.Context, eth2Client eth2client.Service
 
 				syncCommitteesProvider, isProvider := eth2Client.(eth2client.SyncCommitteesProvider)
 				if isProvider {
-					syncCommittee, err := syncCommitteesProvider.SyncCommittee(ctx, fmt.Sprintf("%d", uint64(epoch)*slotsPerEpoch))
+					syncCommitteeResponse, err := syncCommitteesProvider.SyncCommittee(ctx, &api.SyncCommitteeOpts{
+						State: strconv.FormatUint(uint64(epoch)*slotsPerEpoch, 10),
+					})
 					if err != nil {
 						res.WriteString(fmt.Sprintf("  Error: failed to obtain sync committee: %v\n", err))
 					} else {
 						res.WriteString("  Contributing validators:")
 						for i := uint64(0); i < syncAggregate.SyncCommitteeBits.Len(); i++ {
 							if syncAggregate.SyncCommitteeBits.BitAt(i) {
-								res.WriteString(fmt.Sprintf(" %d", syncCommittee.Validators[i]))
+								res.WriteString(fmt.Sprintf(" %d", syncCommitteeResponse.Data.Validators[i]))
 							}
 						}
 						res.WriteString("\n")
diff --git a/cmd/block/info/process.go b/cmd/block/info/process.go
index 92c57e2..989ab2b 100644
--- a/cmd/block/info/process.go
+++ b/cmd/block/info/process.go
@@ -23,7 +23,8 @@ import (
 	"time"
 
 	eth2client "github.com/attestantio/go-eth2-client"
-	api "github.com/attestantio/go-eth2-client/api/v1"
+	"github.com/attestantio/go-eth2-client/api"
+	apiv1 "github.com/attestantio/go-eth2-client/api/v1"
 	"github.com/attestantio/go-eth2-client/spec"
 	"github.com/attestantio/go-eth2-client/spec/altair"
 	"github.com/attestantio/go-eth2-client/spec/bellatrix"
@@ -54,17 +55,18 @@ func process(ctx context.Context, data *dataIn) (*dataOut, error) {
 		eth2Client: data.eth2Client,
 	}
 
-	config, err := results.eth2Client.(eth2client.SpecProvider).Spec(ctx)
+	specResponse, err := results.eth2Client.(eth2client.SpecProvider).Spec(ctx)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to connect to obtain configuration information")
 	}
-	genesis, err := results.eth2Client.(eth2client.GenesisProvider).Genesis(ctx)
+	genesisResponse, err := results.eth2Client.(eth2client.GenesisProvider).Genesis(ctx)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to connect to obtain genesis information")
 	}
+	genesis := genesisResponse.Data
 	results.genesisTime = genesis.GenesisTime
-	results.slotDuration = config["SECONDS_PER_SLOT"].(time.Duration)
-	results.slotsPerEpoch = config["SLOTS_PER_EPOCH"].(uint64)
+	results.slotDuration = specResponse.Data["SECONDS_PER_SLOT"].(time.Duration)
+	results.slotsPerEpoch = specResponse.Data["SLOTS_PER_EPOCH"].(uint64)
 
 	if data.blockTime != "" {
 		data.blockID, err = timeToBlockID(ctx, data.eth2Client, data.blockTime)
@@ -73,43 +75,50 @@ func process(ctx context.Context, data *dataIn) (*dataOut, error) {
 		}
 	}
 
-	signedBlock, err := results.eth2Client.(eth2client.SignedBeaconBlockProvider).SignedBeaconBlock(ctx, data.blockID)
+	blockResponse, err := results.eth2Client.(eth2client.SignedBeaconBlockProvider).SignedBeaconBlock(ctx, &api.SignedBeaconBlockOpts{
+		Block: data.blockID,
+	})
 	if err != nil {
+		var apiErr *api.Error
+		if errors.As(err, &apiErr) && apiErr.StatusCode == 404 {
+			if data.quiet {
+				os.Exit(1)
+			}
+			return nil, errors.New("empty beacon block")
+		}
 		return nil, errors.Wrap(err, "failed to obtain beacon block")
 	}
-	if signedBlock == nil {
-		if data.quiet {
-			os.Exit(1)
-		}
-		return nil, errors.New("empty beacon block")
-	}
+	block := blockResponse.Data
 	if data.quiet {
 		os.Exit(0)
 	}
 
-	switch signedBlock.Version {
+	switch block.Version {
 	case spec.DataVersionPhase0:
-		if err := outputPhase0Block(ctx, data.jsonOutput, signedBlock.Phase0); err != nil {
+		if err := outputPhase0Block(ctx, data.jsonOutput, block.Phase0); err != nil {
 			return nil, errors.Wrap(err, "failed to output block")
 		}
 	case spec.DataVersionAltair:
-		if err := outputAltairBlock(ctx, data.jsonOutput, data.sszOutput, signedBlock.Altair); err != nil {
+		if err := outputAltairBlock(ctx, data.jsonOutput, data.sszOutput, block.Altair); err != nil {
 			return nil, errors.Wrap(err, "failed to output block")
 		}
 	case spec.DataVersionBellatrix:
-		if err := outputBellatrixBlock(ctx, data.jsonOutput, data.sszOutput, signedBlock.Bellatrix); err != nil {
+		if err := outputBellatrixBlock(ctx, data.jsonOutput, data.sszOutput, block.Bellatrix); err != nil {
 			return nil, errors.Wrap(err, "failed to output block")
 		}
 	case spec.DataVersionCapella:
-		if err := outputCapellaBlock(ctx, data.jsonOutput, data.sszOutput, signedBlock.Capella); err != nil {
+		if err := outputCapellaBlock(ctx, data.jsonOutput, data.sszOutput, block.Capella); err != nil {
 			return nil, errors.Wrap(err, "failed to output block")
 		}
 	case spec.DataVersionDeneb:
-		blobs, err := results.eth2Client.(eth2client.BeaconBlockBlobsProvider).BeaconBlockBlobs(ctx, data.blockID)
+		blobSidecarsResponse, err := results.eth2Client.(eth2client.BlobSidecarsProvider).BlobSidecars(ctx, &api.BlobSidecarsOpts{
+			Block: data.blockID,
+		})
 		if err != nil {
-			return nil, errors.Wrap(err, "failed to obtain blobs")
+			return nil, errors.Wrap(err, "failed to obtain blob sidecars")
 		}
-		if err := outputDenebBlock(ctx, data.jsonOutput, data.sszOutput, signedBlock.Deneb, blobs); err != nil {
+		blobSidecars := blobSidecarsResponse.Data
+		if err := outputDenebBlock(ctx, data.jsonOutput, data.sszOutput, block.Deneb, blobSidecars); err != nil {
 			return nil, errors.Wrap(err, "failed to output block")
 		}
 	default:
@@ -132,7 +141,7 @@ func process(ctx context.Context, data *dataIn) (*dataOut, error) {
 	return &dataOut{}, nil
 }
 
-func headEventHandler(event *api.Event) {
+func headEventHandler(event *apiv1.Event) {
 	ctx := context.Background()
 
 	// Only interested in head events.
@@ -140,35 +149,40 @@ func headEventHandler(event *api.Event) {
 		return
 	}
 
-	blockID := fmt.Sprintf("%#x", event.Data.(*api.HeadEvent).Block[:])
-	signedBlock, err := results.eth2Client.(eth2client.SignedBeaconBlockProvider).SignedBeaconBlock(ctx, blockID)
+	blockID := fmt.Sprintf("%#x", event.Data.(*apiv1.HeadEvent).Block[:])
+	blockResponse, err := results.eth2Client.(eth2client.SignedBeaconBlockProvider).SignedBeaconBlock(ctx, &api.SignedBeaconBlockOpts{
+		Block: blockID,
+	})
 	if err != nil {
 		if !jsonOutput && !sszOutput {
 			fmt.Printf("Failed to obtain block: %v\n", err)
 		}
 		return
 	}
-	if signedBlock == nil {
+	block := blockResponse.Data
+	if block == nil {
 		if !jsonOutput && !sszOutput {
 			fmt.Println("Empty beacon block")
 		}
 		return
 	}
 
-	switch signedBlock.Version {
+	switch block.Version {
 	case spec.DataVersionPhase0:
-		err = outputPhase0Block(ctx, jsonOutput, signedBlock.Phase0)
+		err = outputPhase0Block(ctx, jsonOutput, block.Phase0)
 	case spec.DataVersionAltair:
-		err = outputAltairBlock(ctx, jsonOutput, sszOutput, signedBlock.Altair)
+		err = outputAltairBlock(ctx, jsonOutput, sszOutput, block.Altair)
 	case spec.DataVersionBellatrix:
-		err = outputBellatrixBlock(ctx, jsonOutput, sszOutput, signedBlock.Bellatrix)
+		err = outputBellatrixBlock(ctx, jsonOutput, sszOutput, block.Bellatrix)
 	case spec.DataVersionCapella:
-		err = outputCapellaBlock(ctx, jsonOutput, sszOutput, signedBlock.Capella)
+		err = outputCapellaBlock(ctx, jsonOutput, sszOutput, block.Capella)
 	case spec.DataVersionDeneb:
-		var blobs []*deneb.BlobSidecar
-		blobs, err = results.eth2Client.(eth2client.BeaconBlockBlobsProvider).BeaconBlockBlobs(ctx, blockID)
+		var blobSidecarsResponse *api.Response[[]*deneb.BlobSidecar]
+		blobSidecarsResponse, err = results.eth2Client.(eth2client.BlobSidecarsProvider).BlobSidecars(ctx, &api.BlobSidecarsOpts{
+			Block: blockID,
+		})
 		if err == nil {
-			err = outputDenebBlock(context.Background(), jsonOutput, sszOutput, signedBlock.Deneb, blobs)
+			err = outputDenebBlock(context.Background(), jsonOutput, sszOutput, block.Deneb, blobSidecarsResponse.Data)
 		}
 	default:
 		err = errors.New("unknown block version")
diff --git a/cmd/chain/eth1votes/process.go b/cmd/chain/eth1votes/process.go
index 88882a4..9599931 100644
--- a/cmd/chain/eth1votes/process.go
+++ b/cmd/chain/eth1votes/process.go
@@ -20,6 +20,7 @@ import (
 	"strconv"
 
 	eth2client "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	"github.com/attestantio/go-eth2-client/spec"
 	"github.com/attestantio/go-eth2-client/spec/phase0"
 	"github.com/pkg/errors"
@@ -58,10 +59,13 @@ func (c *command) process(ctx context.Context) error {
 	if fetchSlot > c.chainTime.CurrentSlot() {
 		fetchSlot = c.chainTime.CurrentSlot()
 	}
-	state, err := c.beaconStateProvider.BeaconState(ctx, fmt.Sprintf("%d", fetchSlot))
+	stateResponse, err := c.beaconStateProvider.BeaconState(ctx, &api.BeaconStateOpts{
+		State: fmt.Sprintf("%d", fetchSlot),
+	})
 	if err != nil {
 		return errors.Wrap(err, "failed to obtain state")
 	}
+	state := stateResponse.Data
 	if state == nil {
 		return errors.New("state not returned by beacon node")
 	}
@@ -146,12 +150,12 @@ func (c *command) setup(ctx context.Context) error {
 		return errors.New("connection does not provide spec information")
 	}
 
-	spec, err := specProvider.Spec(ctx)
+	specResponse, err := specProvider.Spec(ctx)
 	if err != nil {
 		return errors.Wrap(err, "failed to obtain spec")
 	}
 
-	tmp, exists := spec["SLOTS_PER_EPOCH"]
+	tmp, exists := specResponse.Data["SLOTS_PER_EPOCH"]
 	if !exists {
 		return errors.New("spec did not contain SLOTS_PER_EPOCH")
 	}
@@ -160,7 +164,7 @@ func (c *command) setup(ctx context.Context) error {
 	if !good {
 		return errors.New("SLOTS_PER_EPOCH value invalid")
 	}
-	tmp, exists = spec["EPOCHS_PER_ETH1_VOTING_PERIOD"]
+	tmp, exists = specResponse.Data["EPOCHS_PER_ETH1_VOTING_PERIOD"]
 	if !exists {
 		return errors.New("spec did not contain EPOCHS_PER_ETH1_VOTING_PERIOD")
 	}
diff --git a/cmd/chain/queues/process.go b/cmd/chain/queues/process.go
index 30b22a3..4d2e2cd 100644
--- a/cmd/chain/queues/process.go
+++ b/cmd/chain/queues/process.go
@@ -18,6 +18,7 @@ import (
 	"fmt"
 
 	eth2client "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	"github.com/pkg/errors"
 	standardchaintime "github.com/wealdtech/ethdo/services/chaintime/standard"
 	"github.com/wealdtech/ethdo/util"
@@ -34,12 +35,14 @@ func (c *command) process(ctx context.Context) error {
 		return err
 	}
 
-	validators, err := c.validatorsProvider.Validators(ctx, fmt.Sprintf("%d", c.chainTime.FirstSlotOfEpoch(epoch)), nil)
+	response, err := c.validatorsProvider.Validators(ctx, &api.ValidatorsOpts{
+		State: fmt.Sprintf("%d", c.chainTime.FirstSlotOfEpoch(epoch)),
+	})
 	if err != nil {
 		return errors.Wrap(err, "failed to obtain validators")
 	}
 
-	for _, validator := range validators {
+	for _, validator := range response.Data {
 		if validator.Validator == nil {
 			continue
 		}
diff --git a/cmd/chain/time/output.go b/cmd/chain/time/output.go
index 2753eb0..d850a40 100644
--- a/cmd/chain/time/output.go
+++ b/cmd/chain/time/output.go
@@ -16,6 +16,7 @@ package chaintime
 import (
 	"context"
 	"fmt"
+	"strconv"
 	"strings"
 	"time"
 
@@ -59,14 +60,14 @@ func output(_ context.Context, data *dataOut) (string, error) {
 	builder.WriteString(data.epochStart.Format("2006-01-02 15:04:05"))
 	if data.verbose {
 		builder.WriteString(" (")
-		builder.WriteString(fmt.Sprintf("%d", data.epochStart.Unix()))
+		builder.WriteString(strconv.FormatInt(data.epochStart.Unix(), 10))
 		builder.WriteString(")")
 	}
 	builder.WriteString("\n  Epoch end ")
 	builder.WriteString(data.epochEnd.Format("2006-01-02 15:04:05"))
 	if data.verbose {
 		builder.WriteString(" (")
-		builder.WriteString(fmt.Sprintf("%d", data.epochEnd.Unix()))
+		builder.WriteString(strconv.FormatInt(data.epochEnd.Unix(), 10))
 		builder.WriteString(")")
 	}
 
@@ -76,27 +77,27 @@ func output(_ context.Context, data *dataOut) (string, error) {
 	builder.WriteString(data.slotStart.Format("2006-01-02 15:04:05"))
 	if data.verbose {
 		builder.WriteString(" (")
-		builder.WriteString(fmt.Sprintf("%d", data.slotStart.Unix()))
+		builder.WriteString(strconv.FormatInt(data.slotStart.Unix(), 10))
 		builder.WriteString(")")
 	}
 	builder.WriteString("\n  Slot end ")
 	builder.WriteString(data.slotEnd.Format("2006-01-02 15:04:05"))
 	if data.verbose {
 		builder.WriteString(" (")
-		builder.WriteString(fmt.Sprintf("%d", data.slotEnd.Unix()))
+		builder.WriteString(strconv.FormatInt(data.slotEnd.Unix(), 10))
 		builder.WriteString(")")
 	}
 
 	if data.hasSyncCommittees {
 		builder.WriteString("\nSync committee period ")
-		builder.WriteString(fmt.Sprintf("%d", data.syncCommitteePeriod))
+		builder.WriteString(strconv.FormatUint(data.syncCommitteePeriod, 10))
 		builder.WriteString("\n  Sync committee period start ")
 		builder.WriteString(data.syncCommitteePeriodStart.Format("2006-01-02 15:04:05"))
 		builder.WriteString(" (epoch ")
 		builder.WriteString(fmt.Sprintf("%d", data.syncCommitteePeriodEpochStart))
 		if data.verbose {
 			builder.WriteString(", ")
-			builder.WriteString(fmt.Sprintf("%d", data.syncCommitteePeriodStart.Unix()))
+			builder.WriteString(strconv.FormatInt(data.syncCommitteePeriodStart.Unix(), 10))
 		}
 		builder.WriteString(")\n  Sync committee period end ")
 		builder.WriteString(data.syncCommitteePeriodEnd.Format("2006-01-02 15:04:05"))
@@ -104,7 +105,7 @@ func output(_ context.Context, data *dataOut) (string, error) {
 		builder.WriteString(fmt.Sprintf("%d", data.syncCommitteePeriodEpochEnd))
 		if data.verbose {
 			builder.WriteString(", ")
-			builder.WriteString(fmt.Sprintf("%d", data.syncCommitteePeriodEnd.Unix()))
+			builder.WriteString(strconv.FormatInt(data.syncCommitteePeriodEnd.Unix(), 10))
 		}
 		builder.WriteString(")")
 	}
diff --git a/cmd/chain/verify/signedcontributionandproof/process.go b/cmd/chain/verify/signedcontributionandproof/process.go
index c6b9cae..e9ecd8f 100644
--- a/cmd/chain/verify/signedcontributionandproof/process.go
+++ b/cmd/chain/verify/signedcontributionandproof/process.go
@@ -22,6 +22,7 @@ import (
 	"os"
 
 	eth2client "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	"github.com/attestantio/go-eth2-client/spec/altair"
 	"github.com/attestantio/go-eth2-client/spec/phase0"
 	"github.com/pkg/errors"
@@ -103,29 +104,32 @@ func (c *command) setup(ctx context.Context) error {
 	}
 
 	stateID := fmt.Sprintf("%d", c.item.Message.Contribution.Slot)
-	validators, err := c.validatorsProvider.Validators(ctx,
-		stateID,
-		[]phase0.ValidatorIndex{c.item.Message.AggregatorIndex},
-	)
+	response, err := c.validatorsProvider.Validators(ctx, &api.ValidatorsOpts{
+		State:   stateID,
+		Indices: []phase0.ValidatorIndex{c.item.Message.AggregatorIndex},
+	})
 	if err != nil {
 		return errors.Wrap(err, "failed to obtain validator information")
 	}
 
-	if len(validators) == 0 || validators[c.item.Message.AggregatorIndex] == nil {
+	if len(response.Data) == 0 || response.Data[c.item.Message.AggregatorIndex] == nil {
 		return nil
 	}
 	c.validatorKnown = true
-	c.validator = validators[c.item.Message.AggregatorIndex]
+	c.validator = response.Data[c.item.Message.AggregatorIndex]
 
 	// Obtain the sync committee
 	syncCommitteesProvider, isProvider := c.eth2Client.(eth2client.SyncCommitteesProvider)
 	if !isProvider {
 		return errors.New("connection does not provide sync committee information")
 	}
-	c.syncCommittee, err = syncCommitteesProvider.SyncCommittee(ctx, stateID)
+	syncCommitteeResponse, err := syncCommitteesProvider.SyncCommittee(ctx, &api.SyncCommitteeOpts{
+		State: stateID,
+	})
 	if err != nil {
 		return errors.Wrap(err, "failed to obtain sync committee information")
 	}
+	c.syncCommittee = syncCommitteeResponse.Data
 
 	return nil
 }
@@ -137,11 +141,11 @@ func (c *command) isAggregator(ctx context.Context) (bool, error) {
 	if !isProvider {
 		return false, errors.New("connection does not provide spec information")
 	}
-	var err error
-	c.spec, err = specProvider.Spec(ctx)
+	specResponse, err := specProvider.Spec(ctx)
 	if err != nil {
 		return false, errors.Wrap(err, "failed to obtain spec information")
 	}
+	c.spec = specResponse.Data
 
 	tmp, exists := c.spec["SYNC_COMMITTEE_SIZE"]
 	if !exists {
@@ -226,16 +230,19 @@ func (c *command) confirmContributionSignature(ctx context.Context) error {
 		fmt.Fprintf(os.Stderr, "Contribution validator indices: %v (%d)\n", includedIndices, len(includedIndices))
 	}
 
-	includedValidators, err := c.validatorsProvider.Validators(ctx, "head", includedIndices)
+	response, err := c.validatorsProvider.Validators(ctx, &api.ValidatorsOpts{
+		State:   "head",
+		Indices: includedIndices,
+	})
 	if err != nil {
 		return errors.Wrap(err, "failed to obtain subcommittee validators")
 	}
-	if len(includedValidators) == 0 {
+	if len(response.Data) == 0 {
 		return errors.New("obtained empty subcommittee validator list")
 	}
 
 	var aggregatePubKey *e2types.BLSPublicKey
-	for _, v := range includedValidators {
+	for _, v := range response.Data {
 		pubKeyBytes := make([]byte, 48)
 		copy(pubKeyBytes, v.Validator.PublicKey[:])
 		pubKey, err := e2types.BLSPublicKeyFromBytes(pubKeyBytes)
diff --git a/cmd/chaininfo.go b/cmd/chaininfo.go
index 149b51f..2e1e177 100644
--- a/cmd/chaininfo.go
+++ b/cmd/chaininfo.go
@@ -20,6 +20,7 @@ import (
 	"time"
 
 	eth2client "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	spec "github.com/attestantio/go-eth2-client/spec/phase0"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
@@ -45,32 +46,32 @@ In quiet mode this will return 0 if the chain information can be obtained, other
 		})
 		errCheck(err, "Failed to connect to Ethereum 2 beacon node")
 
-		config, err := eth2Client.(eth2client.SpecProvider).Spec(ctx)
+		specResponse, err := eth2Client.(eth2client.SpecProvider).Spec(ctx)
 		errCheck(err, "Failed to obtain beacon chain specification")
 
-		genesis, err := eth2Client.(eth2client.GenesisProvider).Genesis(ctx)
+		genesisResponse, err := eth2Client.(eth2client.GenesisProvider).Genesis(ctx)
 		errCheck(err, "Failed to obtain beacon chain genesis")
 
-		fork, err := eth2Client.(eth2client.ForkProvider).Fork(ctx, "head")
+		forkResponse, err := eth2Client.(eth2client.ForkProvider).Fork(ctx, &api.ForkOpts{State: "head"})
 		errCheck(err, "Failed to obtain current fork")
 
 		if viper.GetBool("quiet") {
 			os.Exit(_exitSuccess)
 		}
 
-		if genesis.GenesisTime.Unix() == 0 {
+		if genesisResponse.Data.GenesisTime.Unix() == 0 {
 			fmt.Println("Genesis time: undefined")
 		} else {
-			fmt.Printf("Genesis time: %s\n", genesis.GenesisTime.Format(time.UnixDate))
-			outputIf(viper.GetBool("verbose"), fmt.Sprintf("Genesis timestamp: %v", genesis.GenesisTime.Unix()))
+			fmt.Printf("Genesis time: %s\n", genesisResponse.Data.GenesisTime.Format(time.UnixDate))
+			outputIf(viper.GetBool("verbose"), fmt.Sprintf("Genesis timestamp: %v", genesisResponse.Data.GenesisTime.Unix()))
 		}
-		fmt.Printf("Genesis validators root: %#x\n", genesis.GenesisValidatorsRoot)
-		fmt.Printf("Genesis fork version: %#x\n", config["GENESIS_FORK_VERSION"].(spec.Version))
-		fmt.Printf("Current fork version: %#x\n", fork.CurrentVersion)
+		fmt.Printf("Genesis validators root: %#x\n", genesisResponse.Data.GenesisValidatorsRoot)
+		fmt.Printf("Genesis fork version: %#x\n", specResponse.Data["GENESIS_FORK_VERSION"].(spec.Version))
+		fmt.Printf("Current fork version: %#x\n", forkResponse.Data.CurrentVersion)
 		if viper.GetBool("verbose") {
 			forkData := &spec.ForkData{
-				CurrentVersion:        fork.CurrentVersion,
-				GenesisValidatorsRoot: genesis.GenesisValidatorsRoot,
+				CurrentVersion:        forkResponse.Data.CurrentVersion,
+				GenesisValidatorsRoot: genesisResponse.Data.GenesisValidatorsRoot,
 			}
 			forkDataRoot, err := forkData.HashTreeRoot()
 			if err == nil {
@@ -79,8 +80,8 @@ In quiet mode this will return 0 if the chain information can be obtained, other
 				fmt.Printf("Fork digest: %#x\n", forkDigest)
 			}
 		}
-		fmt.Printf("Seconds per slot: %d\n", int(config["SECONDS_PER_SLOT"].(time.Duration).Seconds()))
-		fmt.Printf("Slots per epoch: %d\n", config["SLOTS_PER_EPOCH"].(uint64))
+		fmt.Printf("Seconds per slot: %d\n", int(specResponse.Data["SECONDS_PER_SLOT"].(time.Duration).Seconds()))
+		fmt.Printf("Slots per epoch: %d\n", specResponse.Data["SLOTS_PER_EPOCH"].(uint64))
 
 		os.Exit(_exitSuccess)
 	},
diff --git a/cmd/chainspec.go b/cmd/chainspec.go
index 40f85d2..b365c99 100644
--- a/cmd/chainspec.go
+++ b/cmd/chainspec.go
@@ -18,6 +18,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"sort"
+	"strconv"
 	"time"
 
 	eth2client "github.com/attestantio/go-eth2-client"
@@ -46,7 +47,7 @@ In quiet mode this will return 0 if the chain specification can be obtained, oth
 		})
 		errCheck(err, "Failed to connect to Ethereum consensus node")
 
-		spec, err := eth2Client.(eth2client.SpecProvider).Spec(ctx)
+		specResponse, err := eth2Client.(eth2client.SpecProvider).Spec(ctx)
 		errCheck(err, "Failed to obtain chain specification")
 
 		if viper.GetBool("quiet") {
@@ -54,35 +55,35 @@ In quiet mode this will return 0 if the chain specification can be obtained, oth
 		}
 
 		// Tweak the spec for output.
-		for k, v := range spec {
+		for k, v := range specResponse.Data {
 			switch t := v.(type) {
 			case phase0.Version:
-				spec[k] = fmt.Sprintf("%#x", t)
+				specResponse.Data[k] = fmt.Sprintf("%#x", t)
 			case phase0.DomainType:
-				spec[k] = fmt.Sprintf("%#x", t)
+				specResponse.Data[k] = fmt.Sprintf("%#x", t)
 			case time.Time:
-				spec[k] = fmt.Sprintf("%d", t.Unix())
+				specResponse.Data[k] = strconv.FormatInt(t.Unix(), 10)
 			case time.Duration:
-				spec[k] = fmt.Sprintf("%d", uint64(t.Seconds()))
+				specResponse.Data[k] = strconv.FormatUint(uint64(t.Seconds()), 10)
 			case []byte:
-				spec[k] = fmt.Sprintf("%#x", t)
+				specResponse.Data[k] = fmt.Sprintf("%#x", t)
 			case uint64:
-				spec[k] = fmt.Sprintf("%d", t)
+				specResponse.Data[k] = strconv.FormatUint(t, 10)
 			}
 		}
 
 		if viper.GetBool("json") {
-			data, err := json.Marshal(spec)
+			data, err := json.Marshal(specResponse.Data)
 			errCheck(err, "Failed to marshal JSON")
 			fmt.Printf("%s\n", string(data))
 		} else {
-			keys := make([]string, 0, len(spec))
-			for k := range spec {
+			keys := make([]string, 0, len(specResponse.Data))
+			for k := range specResponse.Data {
 				keys = append(keys, k)
 			}
 			sort.Strings(keys)
 			for _, key := range keys {
-				fmt.Printf("%s: %v\n", key, spec[key])
+				fmt.Printf("%s: %v\n", key, specResponse.Data[key])
 			}
 		}
 	},
diff --git a/cmd/chainstatus.go b/cmd/chainstatus.go
index 4cc1a59..eea6a3c 100644
--- a/cmd/chainstatus.go
+++ b/cmd/chainstatus.go
@@ -17,10 +17,12 @@ import (
 	"context"
 	"fmt"
 	"os"
+	"strconv"
 	"strings"
 	"time"
 
 	eth2client "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	apiv1 "github.com/attestantio/go-eth2-client/api/v1"
 	"github.com/attestantio/go-eth2-client/spec/phase0"
 	"github.com/spf13/cobra"
@@ -57,8 +59,11 @@ In quiet mode this will return 0 if the chain status can be obtained, otherwise
 
 		finalityProvider, isProvider := eth2Client.(eth2client.FinalityProvider)
 		assert(isProvider, "beacon node does not provide finality; cannot report on chain status")
-		finality, err := finalityProvider.Finality(ctx, "head")
+		finalityResponse, err := finalityProvider.Finality(ctx, &api.FinalityOpts{
+			State: "head",
+		})
 		errCheck(err, "Failed to obtain finality information")
+		finality := finalityResponse.Data
 
 		slot := chainTime.CurrentSlot()
 
@@ -126,13 +131,13 @@ In quiet mode this will return 0 if the chain status can be obtained, otherwise
 		if viper.GetBool("verbose") {
 			validatorsProvider, isProvider := eth2Client.(eth2client.ValidatorsProvider)
 			if isProvider {
-				validators, err := validatorsProvider.Validators(ctx, "head", nil)
+				validatorsResponse, err := validatorsProvider.Validators(ctx, &api.ValidatorsOpts{State: "head"})
 				errCheck(err, "Failed to obtain validators information")
 				// Stats of inteest.
 				totalBalance := phase0.Gwei(0)
 				activeEffectiveBalance := phase0.Gwei(0)
 				validatorCount := make(map[apiv1.ValidatorState]int)
-				for _, validator := range validators {
+				for _, validator := range validatorsResponse.Data {
 					validatorCount[validator.Status]++
 					totalBalance += validator.Balance
 					if validator.Status.IsActive() {
@@ -162,7 +167,7 @@ In quiet mode this will return 0 if the chain status can be obtained, otherwise
 			nextPeriodTimestamp := chainTime.StartOfEpoch(nextPeriodStartEpoch)
 
 			res.WriteString("Sync committee period: ")
-			res.WriteString(fmt.Sprintf("%d", period))
+			res.WriteString(strconv.FormatUint(period, 10))
 			res.WriteString("\n")
 
 			if viper.GetBool("verbose") {
diff --git a/cmd/epoch/summary/process.go b/cmd/epoch/summary/process.go
index 1b62080..da3376d 100644
--- a/cmd/epoch/summary/process.go
+++ b/cmd/epoch/summary/process.go
@@ -19,6 +19,7 @@ import (
 	"sort"
 
 	eth2client "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	apiv1 "github.com/attestantio/go-eth2-client/api/v1"
 	"github.com/attestantio/go-eth2-client/spec"
 	"github.com/attestantio/go-eth2-client/spec/altair"
@@ -55,14 +56,14 @@ func (c *command) process(ctx context.Context) error {
 }
 
 func (c *command) processProposerDuties(ctx context.Context) error {
-	duties, err := c.proposerDutiesProvider.ProposerDuties(ctx, c.summary.Epoch, nil)
+	response, err := c.proposerDutiesProvider.ProposerDuties(ctx, &api.ProposerDutiesOpts{
+		Epoch: c.summary.Epoch,
+	})
 	if err != nil {
 		return errors.Wrap(err, "failed to obtain proposer duties")
 	}
-	if duties == nil {
-		return errors.New("empty proposer duties")
-	}
-	for _, duty := range duties {
+
+	for _, duty := range response.Data {
 		block, err := c.fetchBlock(ctx, fmt.Sprintf("%d", duty.Slot))
 		if err != nil {
 			return errors.Wrap(err, fmt.Sprintf("failed to obtain block for slot %d", duty.Slot))
@@ -79,12 +80,14 @@ func (c *command) processProposerDuties(ctx context.Context) error {
 }
 
 func (c *command) activeValidators(ctx context.Context) (map[phase0.ValidatorIndex]*apiv1.Validator, error) {
-	validators, err := c.validatorsProvider.Validators(ctx, fmt.Sprintf("%d", c.chainTime.FirstSlotOfEpoch(c.summary.Epoch)), nil)
+	response, err := c.validatorsProvider.Validators(ctx, &api.ValidatorsOpts{
+		State: fmt.Sprintf("%d", c.chainTime.FirstSlotOfEpoch(c.summary.Epoch)),
+	})
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to obtain validators for epoch")
 	}
 	activeValidators := make(map[phase0.ValidatorIndex]*apiv1.Validator)
-	for _, validator := range validators {
+	for _, validator := range response.Data {
 		if validator.Validator.ActivationEpoch <= c.summary.Epoch && validator.Validator.ExitEpoch > c.summary.Epoch {
 			activeValidators[validator.Index] = validator
 		}
@@ -187,11 +190,13 @@ func (c *command) processSlots(ctx context.Context,
 			}
 			slotCommittees, exists := allCommittees[attestation.Data.Slot]
 			if !exists {
-				beaconCommittees, err := c.beaconCommitteesProvider.BeaconCommittees(ctx, fmt.Sprintf("%d", attestation.Data.Slot))
+				response, err := c.beaconCommitteesProvider.BeaconCommittees(ctx, &api.BeaconCommitteesOpts{
+					State: fmt.Sprintf("%d", attestation.Data.Slot),
+				})
 				if err != nil {
 					return 0, 0, 0, 0, 0, 0, nil, nil, errors.Wrap(err, fmt.Sprintf("failed to obtain committees for slot %d", attestation.Data.Slot))
 				}
-				for _, beaconCommittee := range beaconCommittees {
+				for _, beaconCommittee := range response.Data {
 					if _, exists := allCommittees[beaconCommittee.Slot]; !exists {
 						allCommittees[beaconCommittee.Slot] = make(map[phase0.CommitteeIndex][]phase0.ValidatorIndex)
 					}
@@ -257,10 +262,13 @@ func (c *command) processSyncCommitteeDuties(ctx context.Context) error {
 		return nil
 	}
 
-	committee, err := c.syncCommitteesProvider.SyncCommittee(ctx, fmt.Sprintf("%d", c.summary.FirstSlot))
+	committeeResponse, err := c.syncCommitteesProvider.SyncCommittee(ctx, &api.SyncCommitteeOpts{
+		State: fmt.Sprintf("%d", c.summary.FirstSlot),
+	})
 	if err != nil {
 		return errors.Wrap(err, "failed to obtain sync committee")
 	}
+	committee := committeeResponse.Data
 	if len(committee.Validators) == 0 {
 		return errors.Wrap(err, "empty sync committee")
 	}
@@ -407,10 +415,13 @@ func (c *command) fetchBlock(ctx context.Context,
 	block, exists := c.blocksCache[blockID]
 	if !exists {
 		var err error
-		block, err = c.blocksProvider.SignedBeaconBlock(ctx, blockID)
+		blockResponse, err := c.blocksProvider.SignedBeaconBlock(ctx, &api.SignedBeaconBlockOpts{
+			Block: blockID,
+		})
 		if err != nil {
 			return nil, errors.Wrap(err, "failed to fetch block")
 		}
+		block = blockResponse.Data
 		c.blocksCache[blockID] = block
 	}
 	return block, nil
diff --git a/cmd/exitverify.go b/cmd/exitverify.go
index 79b5787..1cedfee 100644
--- a/cmd/exitverify.go
+++ b/cmd/exitverify.go
@@ -21,6 +21,7 @@ import (
 	"strings"
 
 	consensusclient "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	v1 "github.com/attestantio/go-eth2-client/api/v1"
 	"github.com/attestantio/go-eth2-client/spec/phase0"
 	"github.com/pkg/errors"
@@ -67,10 +68,11 @@ In quiet mode this will return 0 if the exit is verified correctly, otherwise 1.
 		opRoot, err := signedOp.Message.HashTreeRoot()
 		errCheck(err, "Failed to obtain exit hash tree root")
 
-		genesis, err := eth2Client.(consensusclient.GenesisProvider).Genesis(ctx)
+		genesisResponse, err := eth2Client.(consensusclient.GenesisProvider).Genesis(ctx)
 		errCheck(err, "Failed to obtain beacon chain genesis")
+		genesis := genesisResponse.Data
 
-		fork, err := eth2Client.(consensusclient.ForkProvider).Fork(ctx, "head")
+		response, err := eth2Client.(consensusclient.ForkProvider).Fork(ctx, &api.ForkOpts{State: "head"})
 		errCheck(err, "Failed to obtain fork information")
 
 		// Check against current and prior fork versions.
@@ -83,14 +85,14 @@ In quiet mode this will return 0 if the exit is verified correctly, otherwise 1.
 
 		// Try with the current fork.
 		domain := phase0.Domain{}
-		currentExitDomain, err := e2types.ComputeDomain(e2types.DomainVoluntaryExit, fork.CurrentVersion[:], genesis.GenesisValidatorsRoot[:])
+		currentExitDomain, err := e2types.ComputeDomain(e2types.DomainVoluntaryExit, response.Data.CurrentVersion[:], genesis.GenesisValidatorsRoot[:])
 		errCheck(err, "Failed to compute domain")
 		copy(domain[:], currentExitDomain)
 		verified, err = util.VerifyRoot(account, opRoot, domain, sig)
 		errCheck(err, "Failed to verify voluntary exit")
 		if !verified {
 			// Try again with the previous fork.
-			previousExitDomain, err := e2types.ComputeDomain(e2types.DomainVoluntaryExit, fork.PreviousVersion[:], genesis.GenesisValidatorsRoot[:])
+			previousExitDomain, err := e2types.ComputeDomain(e2types.DomainVoluntaryExit, response.Data.PreviousVersion[:], genesis.GenesisValidatorsRoot[:])
 			copy(domain[:], previousExitDomain)
 			errCheck(err, "Failed to compute domain")
 			verified, err = util.VerifyRoot(account, opRoot, domain, sig)
diff --git a/cmd/nodeinfo.go b/cmd/nodeinfo.go
index 283ed4f..c545825 100644
--- a/cmd/nodeinfo.go
+++ b/cmd/nodeinfo.go
@@ -48,14 +48,14 @@ In quiet mode this will return 0 if the node information can be obtained, otherw
 		}
 
 		if viper.GetBool("verbose") {
-			version, err := eth2Client.(eth2client.NodeVersionProvider).NodeVersion(ctx)
+			versionResponse, err := eth2Client.(eth2client.NodeVersionProvider).NodeVersion(ctx)
 			errCheck(err, "Failed to obtain node version")
-			fmt.Printf("Version: %s\n", version)
+			fmt.Printf("Version: %s\n", versionResponse.Data)
 		}
 
-		syncState, err := eth2Client.(eth2client.NodeSyncingProvider).NodeSyncing(ctx)
+		syncStateResponse, err := eth2Client.(eth2client.NodeSyncingProvider).NodeSyncing(ctx)
 		errCheck(err, "failed to obtain node sync state")
-		fmt.Printf("Syncing: %t\n", syncState.SyncDistance != 0)
+		fmt.Printf("Syncing: %t\n", syncStateResponse.Data.SyncDistance != 0)
 
 		os.Exit(_exitSuccess)
 	},
diff --git a/cmd/proposer/duties/process.go b/cmd/proposer/duties/process.go
index fba523d..ab8f925 100644
--- a/cmd/proposer/duties/process.go
+++ b/cmd/proposer/duties/process.go
@@ -17,6 +17,7 @@ import (
 	"context"
 
 	eth2client "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	apiv1 "github.com/attestantio/go-eth2-client/api/v1"
 	"github.com/pkg/errors"
 	standardchaintime "github.com/wealdtech/ethdo/services/chaintime/standard"
@@ -45,14 +46,16 @@ func (c *command) processSlot(ctx context.Context) error {
 
 	c.results.Epoch = c.chainTime.SlotToEpoch(slot)
 
-	duties, err := c.proposerDutiesProvider.ProposerDuties(ctx, c.results.Epoch, nil)
+	response, err := c.proposerDutiesProvider.ProposerDuties(ctx, &api.ProposerDutiesOpts{
+		Epoch: c.results.Epoch,
+	})
 	if err != nil {
 		return errors.Wrap(err, "failed to obtain proposer duties")
 	}
 
 	c.results.Duties = make([]*apiv1.ProposerDuty, 0, 1)
 
-	for _, duty := range duties {
+	for _, duty := range response.Data {
 		if duty.Slot == slot {
 			c.results.Duties = append(c.results.Duties, duty)
 			break
@@ -69,10 +72,13 @@ func (c *command) processEpoch(ctx context.Context) error {
 		return errors.Wrap(err, "failed to parse epoch")
 	}
 
-	c.results.Duties, err = c.proposerDutiesProvider.ProposerDuties(ctx, c.results.Epoch, nil)
+	dutiesResponse, err := c.proposerDutiesProvider.ProposerDuties(ctx, &api.ProposerDutiesOpts{
+		Epoch: c.results.Epoch,
+	})
 	if err != nil {
 		return errors.Wrap(err, "failed to obtain proposer duties")
 	}
+	c.results.Duties = dutiesResponse.Data
 
 	return nil
 }
diff --git a/cmd/slot/time/process.go b/cmd/slot/time/process.go
index c3c20b0..ee5e9bc 100644
--- a/cmd/slot/time/process.go
+++ b/cmd/slot/time/process.go
@@ -41,17 +41,18 @@ func process(ctx context.Context, data *dataIn) (*dataOut, error) {
 		return nil, errors.New("slot must be a positive integer")
 	}
 
-	genesis, err := data.eth2Client.(eth2client.GenesisProvider).Genesis(ctx)
+	genesisResponse, err := data.eth2Client.(eth2client.GenesisProvider).Genesis(ctx)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to obtain genesis information")
 	}
+	genesis := genesisResponse.Data
 
-	config, err := data.eth2Client.(eth2client.SpecProvider).Spec(ctx)
+	specResponse, err := data.eth2Client.(eth2client.SpecProvider).Spec(ctx)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to obtain chain specifications")
 	}
 
-	slotDuration := config["SECONDS_PER_SLOT"].(time.Duration)
+	slotDuration := specResponse.Data["SECONDS_PER_SLOT"].(time.Duration)
 
 	results.startTime = genesis.GenesisTime.Add((time.Duration(slot*int64(slotDuration.Seconds())) * time.Second))
 	results.endTime = results.startTime.Add(slotDuration)
diff --git a/cmd/synccommittee/inclusion/output.go b/cmd/synccommittee/inclusion/output.go
index 26bf111..3732643 100644
--- a/cmd/synccommittee/inclusion/output.go
+++ b/cmd/synccommittee/inclusion/output.go
@@ -16,6 +16,7 @@ package inclusion
 import (
 	"context"
 	"fmt"
+	"strconv"
 	"strings"
 )
 
@@ -53,13 +54,13 @@ func (c *command) output(_ context.Context) (string, error) {
 			}
 		}
 		builder.WriteString("Expected: ")
-		builder.WriteString(fmt.Sprintf("%d", len(c.inclusions)))
+		builder.WriteString(strconv.Itoa(len(c.inclusions)))
 		builder.WriteString("\nIncluded: ")
-		builder.WriteString(fmt.Sprintf("%d", included))
+		builder.WriteString(strconv.Itoa(included))
 		builder.WriteString("\nMissed: ")
-		builder.WriteString(fmt.Sprintf("%d", missed))
+		builder.WriteString(strconv.Itoa(missed))
 		builder.WriteString("\nNo block: ")
-		builder.WriteString(fmt.Sprintf("%d", noBlock))
+		builder.WriteString(strconv.Itoa(noBlock))
 
 		builder.WriteString("\nPer-slot result: ")
 		for i, inclusion := range c.inclusions {
diff --git a/cmd/synccommittee/inclusion/process.go b/cmd/synccommittee/inclusion/process.go
index 6b01511..f9b5440 100644
--- a/cmd/synccommittee/inclusion/process.go
+++ b/cmd/synccommittee/inclusion/process.go
@@ -18,6 +18,7 @@ import (
 	"fmt"
 
 	eth2client "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	"github.com/attestantio/go-eth2-client/spec"
 	"github.com/attestantio/go-eth2-client/spec/altair"
 	"github.com/pkg/errors"
@@ -41,10 +42,14 @@ func (c *command) process(ctx context.Context) error {
 		return err
 	}
 
-	syncCommittee, err := c.eth2Client.(eth2client.SyncCommitteesProvider).SyncCommitteeAtEpoch(ctx, "head", c.epoch)
+	syncCommitteeResponse, err := c.eth2Client.(eth2client.SyncCommitteesProvider).SyncCommittee(ctx, &api.SyncCommitteeOpts{
+		State: "head",
+		Epoch: &c.epoch,
+	})
 	if err != nil {
 		return errors.Wrap(err, "failed to obtain sync committee information")
 	}
+	syncCommittee := syncCommitteeResponse.Data
 
 	if syncCommittee == nil {
 		return errors.New("no sync committee returned")
@@ -67,10 +72,13 @@ func (c *command) process(ctx context.Context) error {
 			lastSlot = c.chainTime.CurrentSlot()
 		}
 		for slot := firstSlot; slot <= lastSlot; slot++ {
-			block, err := c.eth2Client.(eth2client.SignedBeaconBlockProvider).SignedBeaconBlock(ctx, fmt.Sprintf("%d", slot))
+			blockResponse, err := c.eth2Client.(eth2client.SignedBeaconBlockProvider).SignedBeaconBlock(ctx, &api.SignedBeaconBlockOpts{
+				Block: fmt.Sprintf("%d", slot),
+			})
 			if err != nil {
 				return err
 			}
+			block := blockResponse.Data
 			if block == nil {
 				c.inclusions = append(c.inclusions, 0)
 				continue
diff --git a/cmd/synccommittee/members/process.go b/cmd/synccommittee/members/process.go
index 7d942d8..06fc0bf 100644
--- a/cmd/synccommittee/members/process.go
+++ b/cmd/synccommittee/members/process.go
@@ -19,6 +19,7 @@ import (
 	"strings"
 
 	eth2client "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	"github.com/attestantio/go-eth2-client/spec/phase0"
 	"github.com/pkg/errors"
 	"github.com/wealdtech/ethdo/util"
@@ -34,10 +35,14 @@ func process(ctx context.Context, data *dataIn) (*dataOut, error) {
 		return nil, err
 	}
 
-	syncCommittee, err := data.eth2Client.(eth2client.SyncCommitteesProvider).SyncCommitteeAtEpoch(ctx, "head", epoch)
+	syncCommitteeResponse, err := data.eth2Client.(eth2client.SyncCommitteesProvider).SyncCommittee(ctx, &api.SyncCommitteeOpts{
+		State: "head",
+		Epoch: &epoch,
+	})
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to obtain sync committee information")
 	}
+	syncCommittee := syncCommitteeResponse.Data
 
 	if syncCommittee == nil {
 		return nil, errors.New("no sync committee returned")
diff --git a/cmd/validator/credentials/get/output.go b/cmd/validator/credentials/get/output.go
index 0e51707..afdc2d9 100644
--- a/cmd/validator/credentials/get/output.go
+++ b/cmd/validator/credentials/get/output.go
@@ -15,6 +15,7 @@ package validatorcredentialsget
 
 import (
 	"context"
+	"encoding/hex"
 	"fmt"
 	"strings"
 
@@ -47,7 +48,7 @@ func (c *command) output(_ context.Context) (string, error) {
 
 // addressBytesToEIP55 converts a byte array in to an EIP-55 string format.
 func addressBytesToEIP55(address []byte) string {
-	bytes := []byte(fmt.Sprintf("%x", address))
+	bytes := []byte(hex.EncodeToString(address))
 	hash := ethutil.Keccak256(bytes)
 	for i := 0; i < len(bytes); i++ {
 		hashByte := hash[i/2]
diff --git a/cmd/validator/credentials/set/process.go b/cmd/validator/credentials/set/process.go
index 42762b4..c1bf93e 100644
--- a/cmd/validator/credentials/set/process.go
+++ b/cmd/validator/credentials/set/process.go
@@ -828,7 +828,7 @@ func (c *command) obtainForkVersion(_ context.Context) (phase0.Version, error) {
 
 // addressBytesToEIP55 converts a byte array in to an EIP-55 string format.
 func addressBytesToEIP55(address []byte) string {
-	bytes := []byte(fmt.Sprintf("%x", address))
+	bytes := []byte(hex.EncodeToString(address))
 	hash := ethutil.Keccak256(bytes)
 	for i := 0; i < len(bytes); i++ {
 		hashByte := hash[i/2]
diff --git a/cmd/validator/depositdata/process.go b/cmd/validator/depositdata/process.go
index 23b6241..dd29776 100644
--- a/cmd/validator/depositdata/process.go
+++ b/cmd/validator/depositdata/process.go
@@ -155,7 +155,7 @@ func createWithdrawalCredentials(data *dataIn) ([]byte, error) {
 
 // addressBytesToEIP55 converts a byte array in to an EIP-55 string format.
 func addressBytesToEIP55(address []byte) string {
-	bytes := []byte(fmt.Sprintf("%x", address))
+	bytes := []byte(hex.EncodeToString(address))
 	hash := util.Keccak256(bytes)
 	for i := 0; i < len(bytes); i++ {
 		hashByte := hash[i/2]
diff --git a/cmd/validator/duties/process.go b/cmd/validator/duties/process.go
index ecbed80..bd2276d 100644
--- a/cmd/validator/duties/process.go
+++ b/cmd/validator/duties/process.go
@@ -18,7 +18,8 @@ import (
 	"time"
 
 	eth2client "github.com/attestantio/go-eth2-client"
-	api "github.com/attestantio/go-eth2-client/api/v1"
+	"github.com/attestantio/go-eth2-client/api"
+	apiv1 "github.com/attestantio/go-eth2-client/api/v1"
 	spec "github.com/attestantio/go-eth2-client/spec/phase0"
 	"github.com/pkg/errors"
 	"github.com/wealdtech/ethdo/util"
@@ -75,28 +76,32 @@ func process(ctx context.Context, data *dataIn) (*dataOut, error) {
 	}
 	results.nextEpochAttesterDuty = nextEpochAttesterDuty
 
-	genesis, err := eth2Client.(eth2client.GenesisProvider).Genesis(ctx)
+	genesisResponse, err := eth2Client.(eth2client.GenesisProvider).Genesis(ctx)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to obtain genesis data")
 	}
-	results.genesisTime = genesis.GenesisTime
+	results.genesisTime = genesisResponse.Data.GenesisTime
 
-	config, err := eth2Client.(eth2client.SpecProvider).Spec(ctx)
+	specResponse, err := eth2Client.(eth2client.SpecProvider).Spec(ctx)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to obtain beacon chain configuration")
 	}
-	results.slotsPerEpoch = config["SLOTS_PER_EPOCH"].(uint64)
-	results.slotDuration = config["SECONDS_PER_SLOT"].(time.Duration)
+	results.slotsPerEpoch = specResponse.Data["SLOTS_PER_EPOCH"].(uint64)
+	results.slotDuration = specResponse.Data["SECONDS_PER_SLOT"].(time.Duration)
 
 	return results, nil
 }
 
-func attesterDuty(ctx context.Context, eth2Client eth2client.Service, validatorIndex spec.ValidatorIndex, epoch spec.Epoch) (*api.AttesterDuty, error) {
+func attesterDuty(ctx context.Context, eth2Client eth2client.Service, validatorIndex spec.ValidatorIndex, epoch spec.Epoch) (*apiv1.AttesterDuty, error) {
 	// Find the attesting slot for the given epoch.
-	duties, err := eth2Client.(eth2client.AttesterDutiesProvider).AttesterDuties(ctx, epoch, []spec.ValidatorIndex{validatorIndex})
+	dutiesResponse, err := eth2Client.(eth2client.AttesterDutiesProvider).AttesterDuties(ctx, &api.AttesterDutiesOpts{
+		Epoch:   epoch,
+		Indices: []spec.ValidatorIndex{validatorIndex},
+	})
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to obtain attester duties")
 	}
+	duties := dutiesResponse.Data
 
 	if len(duties) == 0 {
 		return nil, errors.New("validator does not have duty for that epoch")
@@ -105,30 +110,33 @@ func attesterDuty(ctx context.Context, eth2Client eth2client.Service, validatorI
 	return duties[0], nil
 }
 
-func proposerDuties(ctx context.Context, eth2Client eth2client.Service, validatorIndex spec.ValidatorIndex, epoch spec.Epoch) ([]*api.ProposerDuty, error) {
+func proposerDuties(ctx context.Context, eth2Client eth2client.Service, validatorIndex spec.ValidatorIndex, epoch spec.Epoch) ([]*apiv1.ProposerDuty, error) {
 	// Fetch the proposer duties for this epoch.
-	proposerDuties, err := eth2Client.(eth2client.ProposerDutiesProvider).ProposerDuties(ctx, epoch, []spec.ValidatorIndex{validatorIndex})
+	proposerDuties, err := eth2Client.(eth2client.ProposerDutiesProvider).ProposerDuties(ctx, &api.ProposerDutiesOpts{
+		Epoch:   epoch,
+		Indices: []spec.ValidatorIndex{validatorIndex},
+	})
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to obtain proposer duties")
 	}
 
-	return proposerDuties, nil
+	return proposerDuties.Data, nil
 }
 
 func currentEpoch(ctx context.Context, eth2Client eth2client.Service) (spec.Epoch, error) {
-	config, err := eth2Client.(eth2client.SpecProvider).Spec(ctx)
+	specResponse, err := eth2Client.(eth2client.SpecProvider).Spec(ctx)
 	if err != nil {
 		return 0, errors.Wrap(err, "failed to obtain beacon chain configuration")
 	}
-	slotsPerEpoch := config["SLOTS_PER_EPOCH"].(uint64)
-	slotDuration := config["SECONDS_PER_SLOT"].(time.Duration)
-	genesis, err := eth2Client.(eth2client.GenesisProvider).Genesis(ctx)
+	slotsPerEpoch := specResponse.Data["SLOTS_PER_EPOCH"].(uint64)
+	slotDuration := specResponse.Data["SECONDS_PER_SLOT"].(time.Duration)
+
+	genesisResponse, err := eth2Client.(eth2client.GenesisProvider).Genesis(ctx)
 	if err != nil {
 		return 0, errors.Wrap(err, "failed to obtain genesis data")
 	}
-
-	if genesis.GenesisTime.After(time.Now()) {
+	if genesisResponse.Data.GenesisTime.After(time.Now()) {
 		return spec.Epoch(0), nil
 	}
-	return spec.Epoch(uint64(time.Since(genesis.GenesisTime).Seconds()) / (uint64(slotDuration.Seconds()) * slotsPerEpoch)), nil
+	return spec.Epoch(uint64(time.Since(genesisResponse.Data.GenesisTime).Seconds()) / (uint64(slotDuration.Seconds()) * slotsPerEpoch)), nil
 }
diff --git a/cmd/validator/expectation/command.go b/cmd/validator/expectation/command.go
index c8ddf67..e7e688a 100644
--- a/cmd/validator/expectation/command.go
+++ b/cmd/validator/expectation/command.go
@@ -16,7 +16,7 @@ package validatorexpectation
 import (
 	"context"
 	"encoding/json"
-	"fmt"
+	"strconv"
 	"time"
 
 	eth2client "github.com/attestantio/go-eth2-client"
@@ -63,11 +63,11 @@ type resultsJSON struct {
 
 func (r *results) MarshalJSON() ([]byte, error) {
 	data := &resultsJSON{
-		ActiveValidators:          fmt.Sprintf("%d", r.activeValidators),
+		ActiveValidators:          strconv.FormatUint(r.activeValidators, 10),
 		TimeBetweenProposals:      durafmt.Parse(r.timeBetweenProposals).LimitFirstN(2).String(),
-		SecsBetweenProposals:      fmt.Sprintf("%d", int64(r.timeBetweenProposals.Seconds())),
+		SecsBetweenProposals:      strconv.FormatInt(int64(r.timeBetweenProposals.Seconds()), 10),
 		TimeBetweenSyncCommittees: durafmt.Parse(r.timeBetweenSyncCommittees).LimitFirstN(2).String(),
-		SecsBetweenSyncCommittees: fmt.Sprintf("%d", int64(r.timeBetweenSyncCommittees.Seconds())),
+		SecsBetweenSyncCommittees: strconv.FormatInt(int64(r.timeBetweenSyncCommittees.Seconds()), 10),
 	}
 	return json.Marshal(data)
 }
diff --git a/cmd/validator/expectation/process.go b/cmd/validator/expectation/process.go
index c4df022..a24ef0b 100644
--- a/cmd/validator/expectation/process.go
+++ b/cmd/validator/expectation/process.go
@@ -19,6 +19,7 @@ import (
 	"time"
 
 	eth2client "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	"github.com/pkg/errors"
 	standardchaintime "github.com/wealdtech/ethdo/services/chaintime/standard"
 	"github.com/wealdtech/ethdo/util"
@@ -45,12 +46,12 @@ func (c *command) calculateProposalChance(ctx context.Context) error {
 	// Chance of proposing a block is 1/activeValidators.
 	// Expectation of number of slots before proposing a block is 1/p, == activeValidators slots.
 
-	spec, err := c.eth2Client.(eth2client.SpecProvider).Spec(ctx)
+	specResponse, err := c.eth2Client.(eth2client.SpecProvider).Spec(ctx)
 	if err != nil {
 		return err
 	}
 
-	tmp, exists := spec["SECONDS_PER_SLOT"]
+	tmp, exists := specResponse.Data["SECONDS_PER_SLOT"]
 	if !exists {
 		return errors.New("spec missing SECONDS_PER_SLOT")
 	}
@@ -68,12 +69,12 @@ func (c *command) calculateSyncCommitteeChance(ctx context.Context) error {
 	// Chance of being in a sync committee is SYNC_COMMITTEE_SIZE/activeValidators.
 	// Expectation of number of periods before being in a sync committee is 1/p, activeValidators/SYNC_COMMITTEE_SIZE periods.
 
-	spec, err := c.eth2Client.(eth2client.SpecProvider).Spec(ctx)
+	specResponse, err := c.eth2Client.(eth2client.SpecProvider).Spec(ctx)
 	if err != nil {
 		return err
 	}
 
-	tmp, exists := spec["SECONDS_PER_SLOT"]
+	tmp, exists := specResponse.Data["SECONDS_PER_SLOT"]
 	if !exists {
 		return errors.New("spec missing SECONDS_PER_SLOT")
 	}
@@ -82,7 +83,7 @@ func (c *command) calculateSyncCommitteeChance(ctx context.Context) error {
 		return errors.New("SECONDS_PER_SLOT of incorrect type")
 	}
 
-	tmp, exists = spec["SYNC_COMMITTEE_SIZE"]
+	tmp, exists = specResponse.Data["SYNC_COMMITTEE_SIZE"]
 	if !exists {
 		return errors.New("spec missing SYNC_COMMITTEE_SIZE")
 	}
@@ -91,7 +92,7 @@ func (c *command) calculateSyncCommitteeChance(ctx context.Context) error {
 		return errors.New("SYNC_COMMITTEE_SIZE of incorrect type")
 	}
 
-	tmp, exists = spec["SLOTS_PER_EPOCH"]
+	tmp, exists = specResponse.Data["SLOTS_PER_EPOCH"]
 	if !exists {
 		return errors.New("spec missing SLOTS_PER_EPOCH")
 	}
@@ -100,7 +101,7 @@ func (c *command) calculateSyncCommitteeChance(ctx context.Context) error {
 		return errors.New("SLOTS_PER_EPOCH of incorrect type")
 	}
 
-	tmp, exists = spec["EPOCHS_PER_SYNC_COMMITTEE_PERIOD"]
+	tmp, exists = specResponse.Data["EPOCHS_PER_SYNC_COMMITTEE_PERIOD"]
 	if !exists {
 		return errors.New("spec missing EPOCHS_PER_SYNC_COMMITTEE_PERIOD")
 	}
@@ -148,13 +149,15 @@ func (c *command) setup(ctx context.Context) error {
 		return errors.New("connection does not provide validator information")
 	}
 
-	validators, err := c.validatorsProvider.Validators(ctx, "head", nil)
+	response, err := c.validatorsProvider.Validators(ctx, &api.ValidatorsOpts{
+		State: "head",
+	})
 	if err != nil {
 		return errors.Wrap(err, "failed to obtain validators")
 	}
 
 	currentEpoch := chainTime.CurrentEpoch()
-	for _, validator := range validators {
+	for _, validator := range response.Data {
 		if validator.Validator.ActivationEpoch <= currentEpoch &&
 			validator.Validator.ExitEpoch > currentEpoch {
 			c.res.activeValidators++
diff --git a/cmd/validator/summary/process.go b/cmd/validator/summary/process.go
index aca89e8..b446f8b 100644
--- a/cmd/validator/summary/process.go
+++ b/cmd/validator/summary/process.go
@@ -19,6 +19,7 @@ import (
 	"sort"
 
 	eth2client "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	apiv1 "github.com/attestantio/go-eth2-client/api/v1"
 	"github.com/attestantio/go-eth2-client/spec/phase0"
 	"github.com/pkg/errors"
@@ -81,21 +82,23 @@ func (c *command) process(ctx context.Context) error {
 }
 
 func (c *command) processProposerDuties(ctx context.Context) error {
-	duties, err := c.proposerDutiesProvider.ProposerDuties(ctx, c.summary.Epoch, nil)
+	response, err := c.proposerDutiesProvider.ProposerDuties(ctx, &api.ProposerDutiesOpts{
+		Epoch: c.summary.Epoch,
+	})
 	if err != nil {
 		return errors.Wrap(err, "failed to obtain proposer duties")
 	}
-	if duties == nil {
-		return errors.New("empty proposer duties")
-	}
-	for _, duty := range duties {
+	for _, duty := range response.Data {
 		if _, exists := c.validatorsByIndex[duty.ValidatorIndex]; !exists {
 			continue
 		}
-		block, err := c.blocksProvider.SignedBeaconBlock(ctx, fmt.Sprintf("%d", duty.Slot))
+		blockResponse, err := c.blocksProvider.SignedBeaconBlock(ctx, &api.SignedBeaconBlockOpts{
+			Block: fmt.Sprintf("%d", duty.Slot),
+		})
 		if err != nil {
 			return errors.Wrap(err, fmt.Sprintf("failed to obtain block for slot %d", duty.Slot))
 		}
+		block := blockResponse.Data
 		present := block != nil
 		c.summary.Proposals = append(c.summary.Proposals, &epochProposal{
 			Slot:     duty.Slot,
@@ -133,10 +136,14 @@ func (c *command) processAttesterDuties(ctx context.Context) error {
 	}
 
 	// Obtain the duties for the validators to know where they should be attesting.
-	duties, err := c.attesterDutiesProvider.AttesterDuties(ctx, c.summary.Epoch, activeValidatorIndices)
+	dutiesResponse, err := c.attesterDutiesProvider.AttesterDuties(ctx, &api.AttesterDutiesOpts{
+		Epoch:   c.summary.Epoch,
+		Indices: activeValidatorIndices,
+	})
 	if err != nil {
 		return errors.Wrap(err, "failed to obtain attester duties")
 	}
+	duties := dutiesResponse.Data
 	for slot := c.chainTime.FirstSlotOfEpoch(c.summary.Epoch); slot < c.chainTime.FirstSlotOfEpoch(c.summary.Epoch+1); slot++ {
 		index := int(slot - c.chainTime.FirstSlotOfEpoch(c.summary.Epoch))
 		c.summary.Slots[index].Attestations = &slotAttestations{}
@@ -213,14 +220,13 @@ func (c *command) processAttesterDutiesSlot(ctx context.Context,
 	headersCache *util.BeaconBlockHeaderCache,
 	activeValidatorIndices []phase0.ValidatorIndex,
 ) error {
-	block, err := c.blocksProvider.SignedBeaconBlock(ctx, fmt.Sprintf("%d", slot))
+	blockResponse, err := c.blocksProvider.SignedBeaconBlock(ctx, &api.SignedBeaconBlockOpts{
+		Block: fmt.Sprintf("%d", slot),
+	})
 	if err != nil {
 		return errors.Wrap(err, fmt.Sprintf("failed to obtain block for slot %d", slot))
 	}
-	if block == nil {
-		// No block at this slot; that's fine.
-		return nil
-	}
+	block := blockResponse.Data
 	attestations, err := block.Attestations()
 	if err != nil {
 		return err
diff --git a/cmd/validator/withdrawal/process.go b/cmd/validator/withdrawal/process.go
index 6b8e3ea..fc3f3c8 100644
--- a/cmd/validator/withdrawal/process.go
+++ b/cmd/validator/withdrawal/process.go
@@ -20,6 +20,7 @@ import (
 	"time"
 
 	consensusclient "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	apiv1 "github.com/attestantio/go-eth2-client/api/v1"
 	"github.com/attestantio/go-eth2-client/spec"
 	"github.com/attestantio/go-eth2-client/spec/phase0"
@@ -49,10 +50,13 @@ func (c *command) process(ctx context.Context) error {
 		return errors.New("validator has nothing to withdraw")
 	}
 
-	block, err := c.consensusClient.(consensusclient.SignedBeaconBlockProvider).SignedBeaconBlock(ctx, "head")
+	blockResponse, err := c.consensusClient.(consensusclient.SignedBeaconBlockProvider).SignedBeaconBlock(ctx, &api.SignedBeaconBlockOpts{
+		Block: "head",
+	})
 	if err != nil {
 		return errors.Wrap(err, "failed to obtain block")
 	}
+	block := blockResponse.Data
 	slot, err := block.Slot()
 	if err != nil {
 		return errors.Wrap(err, "failed to obtain block slot")
@@ -61,12 +65,14 @@ func (c *command) process(ctx context.Context) error {
 		fmt.Fprintf(os.Stderr, "Slot is %d\n", slot)
 	}
 
-	validatorsMap, err := c.consensusClient.(consensusclient.ValidatorsProvider).Validators(ctx, fmt.Sprintf("%d", slot), nil)
+	response, err := c.consensusClient.(consensusclient.ValidatorsProvider).Validators(ctx, &api.ValidatorsOpts{
+		State: fmt.Sprintf("%d", slot),
+	})
 	if err != nil {
 		return errors.Wrap(err, "failed to obtain validators")
 	}
-	validators := make([]*apiv1.Validator, len(validatorsMap))
-	for _, validator := range validatorsMap {
+	validators := make([]*apiv1.Validator, len(response.Data))
+	for _, validator := range response.Data {
 		validators[validator.Index] = validator
 	}
 
@@ -140,18 +146,18 @@ func (c *command) setup(ctx context.Context) error {
 		return errors.Wrap(err, "failed to create chaintime service")
 	}
 
-	spec, err := c.consensusClient.(consensusclient.SpecProvider).Spec(ctx)
+	specResponse, err := c.consensusClient.(consensusclient.SpecProvider).Spec(ctx)
 	if err != nil {
 		return errors.Wrap(err, "failed to obtain spec")
 	}
 
-	if val, exists := spec["MAX_WITHDRAWALS_PER_PAYLOAD"]; !exists {
+	if val, exists := specResponse.Data["MAX_WITHDRAWALS_PER_PAYLOAD"]; !exists {
 		c.maxWithdrawalsPerPayload = 16
 	} else {
 		c.maxWithdrawalsPerPayload = val.(uint64)
 	}
 
-	if val, exists := spec["MAX_EFFECTIVE_BALANCE"]; !exists {
+	if val, exists := specResponse.Data["MAX_EFFECTIVE_BALANCE"]; !exists {
 		c.maxEffectiveBalance = 32000000000
 	} else {
 		c.maxEffectiveBalance = phase0.Gwei(val.(uint64))
diff --git a/cmd/validator/yield/process.go b/cmd/validator/yield/process.go
index c992bbe..037840e 100644
--- a/cmd/validator/yield/process.go
+++ b/cmd/validator/yield/process.go
@@ -20,6 +20,7 @@ import (
 	"strconv"
 
 	eth2client "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	"github.com/pkg/errors"
 	"github.com/shopspring/decimal"
 	standardchaintime "github.com/wealdtech/ethdo/services/chaintime/standard"
@@ -48,12 +49,12 @@ var (
 
 // calculateYield calculates yield from the number of active validators.
 func (c *command) calculateYield(ctx context.Context) error {
-	spec, err := c.eth2Client.(eth2client.SpecProvider).Spec(ctx)
+	specResponse, err := c.eth2Client.(eth2client.SpecProvider).Spec(ctx)
 	if err != nil {
 		return err
 	}
 
-	tmp, exists := spec["BASE_REWARD_FACTOR"]
+	tmp, exists := specResponse.Data["BASE_REWARD_FACTOR"]
 	if !exists {
 		return errors.New("spec missing BASE_REWARD_FACTOR")
 	}
@@ -143,14 +144,16 @@ func (c *command) setup(ctx context.Context) error {
 			return errors.Wrap(err, "failed to parse epoch")
 		}
 
-		validators, err := validatorsProvider.Validators(ctx, fmt.Sprintf("%d", chainTime.FirstSlotOfEpoch(epoch)), nil)
+		response, err := validatorsProvider.Validators(ctx, &api.ValidatorsOpts{
+			State: fmt.Sprintf("%d", chainTime.FirstSlotOfEpoch(epoch)),
+		})
 		if err != nil {
 			return err
 		}
 
 		activeValidators := decimal.Zero
 		activeValidatorBalance := decimal.Zero
-		for _, validator := range validators {
+		for _, validator := range response.Data {
 			if validator.Validator.ActivationEpoch <= epoch &&
 				validator.Validator.ExitEpoch > epoch {
 				activeValidators = activeValidators.Add(one)
diff --git a/cmd/version.go b/cmd/version.go
index 95e94ae..d52f4c5 100644
--- a/cmd/version.go
+++ b/cmd/version.go
@@ -24,7 +24,7 @@ import (
 
 // ReleaseVersion is the release version of the codebase.
 // Usually overridden by tag names when building binaries.
-var ReleaseVersion = "local build (latest release 1.33.2)"
+var ReleaseVersion = "local build (latest release 1.34.0)"
 
 // versionCmd represents the version command.
 var versionCmd = &cobra.Command{
diff --git a/cmd/wallet/sharedexport/output.go b/cmd/wallet/sharedexport/output.go
index 00658a0..57c2993 100644
--- a/cmd/wallet/sharedexport/output.go
+++ b/cmd/wallet/sharedexport/output.go
@@ -15,7 +15,7 @@ package walletsharedexport
 
 import (
 	"context"
-	"fmt"
+	"encoding/hex"
 	"strings"
 
 	"github.com/pkg/errors"
@@ -32,7 +32,7 @@ func output(_ context.Context, data *dataOut) (string, error) {
 
 	builder := strings.Builder{}
 	for i := range data.shares {
-		builder.WriteString(fmt.Sprintf("%x", data.shares[i]))
+		builder.WriteString(hex.EncodeToString(data.shares[i]))
 		if i != len(data.shares)-1 {
 			builder.WriteString("\n")
 		}
diff --git a/go.mod b/go.mod
index c99ccbe..12c7d81 100644
--- a/go.mod
+++ b/go.mod
@@ -3,10 +3,10 @@ module github.com/wealdtech/ethdo
 go 1.20
 
 require (
-	github.com/attestantio/go-eth2-client v0.18.3
+	github.com/attestantio/go-eth2-client v0.19.4
 	github.com/ferranbt/fastssz v0.1.3
 	github.com/gofrs/uuid v4.4.0+incompatible
-	github.com/google/uuid v1.3.0
+	github.com/google/uuid v1.4.0
 	github.com/hako/durafmt v0.0.0-20210608085754-5c1018a4e16b
 	github.com/herumi/bls-eth-go-binary v1.32.1
 	github.com/mitchellh/go-homedir v1.1.0
@@ -14,11 +14,11 @@ require (
 	github.com/pkg/errors v0.9.1
 	github.com/prysmaticlabs/go-bitfield v0.0.0-20210809151128-385d8c5e3fb7
 	github.com/prysmaticlabs/go-ssz v0.0.0-20210121151755-f6208871c388
-	github.com/rs/zerolog v1.30.0
+	github.com/rs/zerolog v1.31.0
 	github.com/shopspring/decimal v1.3.1
 	github.com/spf13/cobra v1.7.0
 	github.com/spf13/pflag v1.0.5
-	github.com/spf13/viper v1.16.0
+	github.com/spf13/viper v1.17.0
 	github.com/stretchr/testify v1.8.4
 	github.com/tyler-smith/go-bip39 v1.1.0
 	github.com/wealdtech/go-bytesutil v1.2.1
@@ -26,7 +26,7 @@ require (
 	github.com/wealdtech/go-eth2-types/v2 v2.8.2
 	github.com/wealdtech/go-eth2-util v1.8.2
 	github.com/wealdtech/go-eth2-wallet v1.16.0
-	github.com/wealdtech/go-eth2-wallet-dirk v1.4.4
+	github.com/wealdtech/go-eth2-wallet-dirk v1.4.5
 	github.com/wealdtech/go-eth2-wallet-distributed v1.2.1
 	github.com/wealdtech/go-eth2-wallet-encryptor-keystorev4 v1.4.1
 	github.com/wealdtech/go-eth2-wallet-hd/v2 v2.7.0
@@ -40,60 +40,65 @@ require (
 )
 
 require (
-	github.com/aws/aws-sdk-go v1.44.317 // indirect
+	github.com/aws/aws-sdk-go v1.46.7 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
-	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/dgraph-io/ristretto v0.1.1 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/fatih/color v1.15.0 // indirect
-	github.com/fsnotify/fsnotify v1.6.0 // indirect
-	github.com/go-logr/logr v1.2.4 // indirect
+	github.com/fsnotify/fsnotify v1.7.0 // indirect
+	github.com/go-logr/logr v1.3.0 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
-	github.com/goccy/go-yaml v1.11.0 // indirect
-	github.com/golang/glog v1.1.1 // indirect
+	github.com/goccy/go-yaml v1.11.2 // indirect
+	github.com/golang/glog v1.1.2 // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/holiman/uint256 v1.2.3 // indirect
+	github.com/huandu/go-clone v1.6.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/jackc/puddle v1.3.0 // indirect
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.5 // indirect
 	github.com/magiconair/properties v1.8.7 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
-	github.com/mattn/go-isatty v0.0.19 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0 // indirect
 	github.com/minio/highwayhash v1.0.2 // indirect
 	github.com/minio/sha256-simd v1.0.1 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
-	github.com/pelletier/go-toml/v2 v2.0.9 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/prometheus/client_golang v1.16.0 // indirect
-	github.com/prometheus/client_model v0.4.0 // indirect
-	github.com/prometheus/common v0.44.0 // indirect
-	github.com/prometheus/procfs v0.11.1 // indirect
+	github.com/pelletier/go-toml/v2 v2.1.0 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/prometheus/client_golang v1.17.0 // indirect
+	github.com/prometheus/client_model v0.5.0 // indirect
+	github.com/prometheus/common v0.45.0 // indirect
+	github.com/prometheus/procfs v0.12.0 // indirect
 	github.com/protolambda/zssz v0.1.5 // indirect
 	github.com/r3labs/sse/v2 v2.10.0 // indirect
+	github.com/sagikazarmark/locafero v0.3.0 // indirect
+	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
 	github.com/shibukawa/configdir v0.0.0-20170330084843-e180dbdc8da0 // indirect
-	github.com/spf13/afero v1.9.5 // indirect
+	github.com/sourcegraph/conc v0.3.0 // indirect
+	github.com/spf13/afero v1.10.0 // indirect
 	github.com/spf13/cast v1.5.1 // indirect
-	github.com/spf13/jwalterweatherman v1.1.0 // indirect
-	github.com/subosito/gotenv v1.4.2 // indirect
+	github.com/subosito/gotenv v1.6.0 // indirect
 	github.com/wealdtech/eth2-signer-api v1.7.1 // indirect
 	github.com/wealdtech/go-indexer v1.1.0 // indirect
-	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.42.0 // indirect
-	go.opentelemetry.io/otel v1.16.0 // indirect
-	go.opentelemetry.io/otel/metric v1.16.0 // indirect
-	go.opentelemetry.io/otel/trace v1.16.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.45.0 // indirect
+	go.opentelemetry.io/otel v1.19.0 // indirect
+	go.opentelemetry.io/otel/metric v1.19.0 // indirect
+	go.opentelemetry.io/otel/trace v1.19.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
 	golang.org/x/crypto v0.14.0 // indirect
+	golang.org/x/exp v0.0.0-20231006140011-7918f672742d // indirect
 	golang.org/x/net v0.17.0 // indirect
-	golang.org/x/sync v0.3.0 // indirect
+	golang.org/x/sync v0.4.0 // indirect
 	golang.org/x/sys v0.13.0 // indirect
-	golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 // indirect
-	google.golang.org/genproto v0.0.0-20230803162519-f966b187b2e5 // indirect
-	google.golang.org/genproto/googleapis/api v0.0.0-20230803162519-f966b187b2e5 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20230803162519-f966b187b2e5 // indirect
-	google.golang.org/grpc v1.57.0 // indirect
+	golang.org/x/xerrors v0.0.0-20231012003039-104605ab7028 // indirect
+	google.golang.org/genproto v0.0.0-20231030173426-d783a09b4405 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20231030173426-d783a09b4405 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20231030173426-d783a09b4405 // indirect
+	google.golang.org/grpc v1.59.0 // indirect
 	google.golang.org/protobuf v1.31.0 // indirect
 	gopkg.in/cenkalti/backoff.v1 v1.1.0 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
diff --git a/go.sum b/go.sum
index 8a57c3b..0942590 100644
--- a/go.sum
+++ b/go.sum
@@ -17,14 +17,14 @@ cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHOb
 cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKPI=
 cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmWk=
 cloud.google.com/go v0.75.0/go.mod h1:VGuuCn7PG0dwsd5XPVm2Mm3wlh3EL55/79EKB6hlPTY=
-cloud.google.com/go v0.110.6 h1:8uYAkj3YHTP/1iwReuHPxLSbdcyc+dSBbzFMrVwDR6Q=
+cloud.google.com/go v0.110.9 h1:e7ITSqGFFk4rbz/JFIqZh3G4VEHguhAL4BQcFlWtU68=
 cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
 cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
 cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
 cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg=
 cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc=
 cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
-cloud.google.com/go/compute v1.23.0 h1:tP41Zoavr8ptEqaW6j+LQOnyBBhO7OkOMAGrgLopTwY=
+cloud.google.com/go/compute v1.23.2 h1:nWEMDhgbBkBJjfpVySqU4jgWdc22PLR0o4vEexZHers=
 cloud.google.com/go/compute/metadata v0.2.3 h1:mg4jlk7mCAj6xXp9UJ4fjI9VUI5rubuGBW5aJ7UnBMY=
 cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
 cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
@@ -43,10 +43,10 @@ github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
-github.com/attestantio/go-eth2-client v0.18.3 h1:hUSYh+uMLyw4mJcXWcvrPLd8ozJl61aWMdx5Cpq9hxk=
-github.com/attestantio/go-eth2-client v0.18.3/go.mod h1:KSVlZSW1A3jUg5H8O89DLtqxgJprRfTtI7k89fLdhu0=
-github.com/aws/aws-sdk-go v1.44.317 h1:+8XWrLmGMwPPXSRSLPzhgcGnzJ2mYkgkrcB9C/GnSOU=
-github.com/aws/aws-sdk-go v1.44.317/go.mod h1:aVsgQcEevwlmQ7qHE9I3h+dtQgpqhFB+i8Phjh7fkwI=
+github.com/attestantio/go-eth2-client v0.19.4 h1:SiiqYqx1EhIgdaToer4FrUuiyG3wnTR4Xwb7/YkbGxA=
+github.com/attestantio/go-eth2-client v0.19.4/go.mod h1:mZve1kV9Ctj0I1HH9gdg+MnI8lZ+Cb2EktEtOYrBlsM=
+github.com/aws/aws-sdk-go v1.46.7 h1:IjvAWeiJZlbETOemOwvheN5L17CvKvKW0T1xOC6d3Sc=
+github.com/aws/aws-sdk-go v1.46.7/go.mod h1:aVsgQcEevwlmQ7qHE9I3h+dtQgpqhFB+i8Phjh7fkwI=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
@@ -67,8 +67,9 @@ github.com/cncf/xds/go v0.0.0-20230607035331-e9ce68804cb4 h1:/inchEIKaYC1Akx+H+g
 github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
 github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
+github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgraph-io/ristretto v0.1.1 h1:6CWw5tJNgpegArSHpNHJKldNeq03FQCwYvfMVWajOK8=
 github.com/dgraph-io/ristretto v0.1.1/go.mod h1:S1GPSBCYCIhmVNfcth17y2zZtQT6wzkzgwUve0VDWWA=
 github.com/dgryski/go-farm v0.0.0-20190423205320-6a90982ecee2 h1:tdlZCpZ/P9DhczCTSixgIKmwPv6+wP5DGjqLYw5SUiA=
@@ -84,34 +85,34 @@ github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.m
 github.com/envoyproxy/go-control-plane v0.9.9-0.20210512163311-63b5d3c536b0/go.mod h1:hliV/p42l8fGbc6Y9bQ70uLwIvmJyVE5k4iMKlh8wCQ=
 github.com/envoyproxy/go-control-plane v0.9.10-0.20210907150352-cf90f659a021/go.mod h1:AFq3mo9L8Lqqiid3OhADV3RfLJnjiw63cSpi+fDTRC0=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
-github.com/envoyproxy/protoc-gen-validate v0.10.1 h1:c0g45+xCJhdgFGw7a5QAfdS4byAbud7miNWJ1WwEVf8=
+github.com/envoyproxy/protoc-gen-validate v1.0.2 h1:QkIBuU5k+x7/QXPvPPnWXWlCdaBFApVqftFV6k087DA=
 github.com/fatih/color v1.15.0 h1:kOqh6YHBtK8aywxGerMG2Eq3H6Qgoqeo13Bk2Mv/nBs=
 github.com/fatih/color v1.15.0/go.mod h1:0h5ZqXfHYED7Bhv2ZJamyIOUej9KtShiJESRwBDUSsw=
 github.com/ferranbt/fastssz v0.1.3 h1:ZI+z3JH05h4kgmFXdHuR1aWYsgrg7o+Fw7/NCzM16Mo=
 github.com/ferranbt/fastssz v0.1.3/go.mod h1:0Y9TEd/9XuFlh7mskMPfXiI2Dkw4Ddg9EyXt1W7MRvE=
 github.com/frankban/quicktest v1.14.4 h1:g2rn0vABPOOXmZUj+vbmUp0lPoXEMuhTpIluN0XL9UY=
-github.com/fsnotify/fsnotify v1.6.0 h1:n+5WquG0fcWoWp6xPWfHdbskMCQaFnG6PfBrh1Ky4HY=
-github.com/fsnotify/fsnotify v1.6.0/go.mod h1:sl3t1tCWJFWoRz9R8WJCbQihKKwmorjAbSClcnxKAGw=
+github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nosvA=
+github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
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@@ -169,8 +170,8 @@ github.com/google/pprof v0.0.0-20201203190320-1bf35d6f28c2/go.mod h1:kpwsk12EmLe
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@@ -185,7 +186,10 @@ github.com/herumi/bls-eth-go-binary v1.32.1 h1:FbSbbNiWmuR9CWkMzFQWT5yujSn4wof48
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@@ -230,22 +233,23 @@ github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyua
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-github.com/spf13/jwalterweatherman v1.1.0/go.mod h1:aNWZUN0dPAAO/Ljvb5BEdw96iTZ0EXowPYD95IqWIGo=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
-github.com/spf13/viper v1.16.0 h1:rGGH0XDZhdUOryiDWjmIvUSWpbNqisK8Wk0Vyefw8hc=
-github.com/spf13/viper v1.16.0/go.mod h1:yg78JgCJcbrQOvV9YLXgkLaZqUidkY9K+Dd1FofRzQg=
+github.com/spf13/viper v1.17.0 h1:I5txKw7MJasPL/BrfkbA0Jyo/oELqVmux4pR/UxOMfI=
+github.com/spf13/viper v1.17.0/go.mod h1:BmMMMLQXSbcHK6KAOiFLz0l5JHrU89OdIRHvsk0+yVI=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
 github.com/stretchr/testify v1.1.4/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
-github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
@@ -291,8 +298,8 @@ github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
-github.com/subosito/gotenv v1.4.2 h1:X1TuBLAMDFbaTAChgCBLu3DU3UPyELpnF2jjJ2cz/S8=
-github.com/subosito/gotenv v1.4.2/go.mod h1:ayKnFf/c6rvx/2iiLrJUk1e6plDbT3edrFNGqEflhK0=
+github.com/subosito/gotenv v1.6.0 h1:9NlTDc1FTs4qu0DDq7AEtTPNw6SVm7uBMsUCUjABIf8=
+github.com/subosito/gotenv v1.6.0/go.mod h1:Dk4QP5c2W3ibzajGcXpNraDfq2IrhjMIvMSWPKKo0FU=
 github.com/tyler-smith/go-bip39 v1.1.0 h1:5eUemwrMargf3BSLRRCalXT93Ns6pQJIjYQN2nyfOP8=
 github.com/tyler-smith/go-bip39 v1.1.0/go.mod h1:gUYDtqQw1JS3ZJ8UWVcGTGqqr6YIN3CWg+kkNaLt55U=
 github.com/umbracle/gohashtree v0.0.2-alpha.0.20230207094856-5b775a815c10 h1:CQh33pStIp/E30b7TxDlXfM0145bn2e8boI30IxAhTg=
@@ -308,8 +315,8 @@ github.com/wealdtech/go-eth2-util v1.8.2 h1:gq+JMrnadifyKadUr75wmfP7+usiqMu9t3VV
 github.com/wealdtech/go-eth2-util v1.8.2/go.mod h1:/80GAK0K/3+PqUBZHvaOPd3b1sjHeimxQh1nrJzgaPk=
 github.com/wealdtech/go-eth2-wallet v1.16.0 h1:syD1xDYB7emk4x+6bTYm5VZp9nx5FLab5Fgm09Eq1Kg=
 github.com/wealdtech/go-eth2-wallet v1.16.0/go.mod h1:JFA2P7PpPR8quQ/T6Gsr/4VLj5sQVnyzKgfPA+eqmYE=
-github.com/wealdtech/go-eth2-wallet-dirk v1.4.4 h1:zPhDCJJvDn98/psfOwtlyDa0r+8c6u8MgXrOnMmcAtA=
-github.com/wealdtech/go-eth2-wallet-dirk v1.4.4/go.mod h1:f5CupAod/d5xa0yOQlfxonpkqsh5XJG38RTkZJBKDiA=
+github.com/wealdtech/go-eth2-wallet-dirk v1.4.5 h1:DXCgvGoA69rMLXSBsoAo4OreanQmgmEjMCf1GviuJhk=
+github.com/wealdtech/go-eth2-wallet-dirk v1.4.5/go.mod h1:z1unDfX2/P4b26WfpMB2toHZ9EyVQtVtaSEz87eFavA=
 github.com/wealdtech/go-eth2-wallet-distributed v1.2.1 h1:+pbG9i9b5TrWd7GDRX8yq4FKA+D7k7aI6uySEvAZ+Kk=
 github.com/wealdtech/go-eth2-wallet-distributed v1.2.1/go.mod h1:jYkDax2VhUNKIct6TVlgxAagvR56/eg7y7J+JFq+gDo=
 github.com/wealdtech/go-eth2-wallet-encryptor-keystorev4 v1.4.1 h1:9j7bpwjT9wmwBb54ZkBhTm1uNIlFFcCJXefd/YskZPw=
@@ -342,15 +349,17 @@ go.opencensus.io v0.22.2/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.5/go.mod h1:5pWMHQbX5EPX2/62yrJeAkowc+lfs/XD7Uxpq3pI6kk=
-go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.42.0 h1:ZOLJc06r4CB42laIXg/7udr0pbZyuAihN10A/XuiQRY=
-go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.42.0/go.mod h1:5z+/ZWJQKXa9YT34fQNx5K8Hd1EoIhvtUygUQPqEOgQ=
-go.opentelemetry.io/otel v1.16.0 h1:Z7GVAX/UkAXPKsy94IU+i6thsQS4nb7LviLpnaNeW8s=
-go.opentelemetry.io/otel v1.16.0/go.mod h1:vl0h9NUa1D5s1nv3A5vZOYWn8av4K8Ml6JDeHrT/bx4=
-go.opentelemetry.io/otel/metric v1.16.0 h1:RbrpwVG1Hfv85LgnZ7+txXioPDoh6EdbZHo26Q3hqOo=
-go.opentelemetry.io/otel/metric v1.16.0/go.mod h1:QE47cpOmkwipPiefDwo2wDzwJrlfxxNYodqc4xnGCo4=
-go.opentelemetry.io/otel/trace v1.16.0 h1:8JRpaObFoW0pxuVPapkgH8UhHQj+bJW8jJsCZEu5MQs=
-go.opentelemetry.io/otel/trace v1.16.0/go.mod h1:Yt9vYq1SdNz3xdjZZK7wcXv1qv2pwLkqr2QVwea0ef0=
+go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.45.0 h1:RsQi0qJ2imFfCvZabqzM9cNXBG8k6gXMv1A0cXRmH6A=
+go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.45.0/go.mod h1:vsh3ySueQCiKPxFLvjWC4Z135gIa34TQ/NSqkDTZYUM=
+go.opentelemetry.io/otel v1.19.0 h1:MuS/TNf4/j4IXsZuJegVzI1cwut7Qc00344rgH7p8bs=
+go.opentelemetry.io/otel v1.19.0/go.mod h1:i0QyjOq3UPoTzff0PJB2N66fb4S0+rSbSB15/oyH9fY=
+go.opentelemetry.io/otel/metric v1.19.0 h1:aTzpGtV0ar9wlV4Sna9sdJyII5jTVJEvKETPiOKwvpE=
+go.opentelemetry.io/otel/metric v1.19.0/go.mod h1:L5rUsV9kM1IxCj1MmSdS+JQAcVm319EUrDVLrt7jqt8=
+go.opentelemetry.io/otel/trace v1.19.0 h1:DFVQmlVbfVeOuBRrwdtaehRrWiL1JoVs9CPIQ1Dzxpg=
+go.opentelemetry.io/otel/trace v1.19.0/go.mod h1:mfaSyvGyEJEI0nyV2I4qhNQnbBOUUmYZpYojqMnX2vo=
 go.opentelemetry.io/proto/otlp v0.7.0/go.mod h1:PqfVotwruBrMGOCsRd/89rSnXhoiJIqeYNgFYFoEGnI=
+go.uber.org/multierr v1.11.0 h1:blXXJkSxSSfBVBlC76pxqeO+LN3aDfLQo+309xJstO0=
+go.uber.org/multierr v1.11.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
@@ -371,6 +380,8 @@ golang.org/x/exp v0.0.0-20191227195350-da58074b4299/go.mod h1:2RIsYlXP63K8oxa1u0
 golang.org/x/exp v0.0.0-20200119233911-0405dc783f0a/go.mod h1:2RIsYlXP63K8oxa1u096TMicItID8zy7Y6sNkU49FU4=
 golang.org/x/exp v0.0.0-20200207192155-f17229e696bd/go.mod h1:J/WKrq2StrnmMY6+EHIKF9dgMWnmCNThgcyBT1FY9mM=
 golang.org/x/exp v0.0.0-20200224162631-6cc2880d07d6/go.mod h1:3jZMyOhIsHpP37uCMkUooju7aAi5cS1Q23tOzKc+0MU=
+golang.org/x/exp v0.0.0-20231006140011-7918f672742d h1:jtJma62tbqLibJ5sFQz8bKtEM8rJBtfilJ2qTU199MI=
+golang.org/x/exp v0.0.0-20231006140011-7918f672742d/go.mod h1:ldy0pHrwJyGW56pPQzzkH36rKxoZW1tw7ZJpeKx+hdo=
 golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
 golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
@@ -443,7 +454,7 @@ golang.org/x/oauth2 v0.0.0-20200902213428-5d25da1a8d43/go.mod h1:KelEdhl1UZF7XfJ
 golang.org/x/oauth2 v0.0.0-20201109201403-9fd604954f58/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
 golang.org/x/oauth2 v0.0.0-20201208152858-08078c50e5b5/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
 golang.org/x/oauth2 v0.0.0-20210218202405-ba52d332ba99/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
-golang.org/x/oauth2 v0.8.0 h1:6dkIjl3j3LtZ/O3sTgZTMsLKSftL/B8Zgq4huOIIUu8=
+golang.org/x/oauth2 v0.12.0 h1:smVPGxink+n1ZI5pkQa8y6fZT0RW0MgCO5bFpepy4B4=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -455,8 +466,8 @@ golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.3.0 h1:ftCYgMx6zT/asHUrPw8BLLscYtGznsLAnjq5RH9P66E=
-golang.org/x/sync v0.3.0/go.mod h1:FU7BRWz2tNW+3quACPkgCx/L+uEAv1htQ0V83Z9Rj+Y=
+golang.org/x/sync v0.4.0 h1:zxkM55ReGkDlKSM+Fu41A+zmbZuaPVbGMzvvdUPznYQ=
+golang.org/x/sync v0.4.0/go.mod h1:FU7BRWz2tNW+3quACPkgCx/L+uEAv1htQ0V83Z9Rj+Y=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190130150945-aca44879d564/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -495,17 +506,15 @@ golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210423185535-09eb48e85fd7/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211025201205-69cdffdb9359/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220908164124-27713097b956/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20221010170243-090e33056c14/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
 golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
@@ -578,8 +587,8 @@ golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8T
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 h1:H2TDz8ibqkAF6YGhCdN3jS9O0/s90v0rJh3X/OLHEUk=
-golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2/go.mod h1:K8+ghG5WaK9qNqU5K3HdILfMLy1f3aNYFI/wnl100a8=
+golang.org/x/xerrors v0.0.0-20231012003039-104605ab7028 h1:+cNy6SZtPcJQH3LJVLOSmiC7MMxXNOb3PU/VUEz+EhU=
+golang.org/x/xerrors v0.0.0-20231012003039-104605ab7028/go.mod h1:NDW/Ps6MPRej6fsCIbMTohpP40sJ/P/vI1MoTEGwX90=
 google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
 google.golang.org/api v0.7.0/go.mod h1:WtwebWUNSVBH/HAw79HIFXZNqEvBhG+Ra+ax0hx3E3M=
 google.golang.org/api v0.8.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
@@ -645,12 +654,12 @@ google.golang.org/genproto v0.0.0-20201214200347-8c77b98c765d/go.mod h1:FWY/as6D
 google.golang.org/genproto v0.0.0-20210108203827-ffc7fda8c3d7/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20210226172003-ab064af71705/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20211027162914-98a5263abeca/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
-google.golang.org/genproto v0.0.0-20230803162519-f966b187b2e5 h1:L6iMMGrtzgHsWofoFcihmDEMYeDR9KN/ThbPWGrh++g=
-google.golang.org/genproto v0.0.0-20230803162519-f966b187b2e5/go.mod h1:oH/ZOT02u4kWEp7oYBGYFFkCdKS/uYR9Z7+0/xuuFp8=
-google.golang.org/genproto/googleapis/api v0.0.0-20230803162519-f966b187b2e5 h1:nIgk/EEq3/YlnmVVXVnm14rC2oxgs1o0ong4sD/rd44=
-google.golang.org/genproto/googleapis/api v0.0.0-20230803162519-f966b187b2e5/go.mod h1:5DZzOUPCLYL3mNkQ0ms0F3EuUNZ7py1Bqeq6sxzI7/Q=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20230803162519-f966b187b2e5 h1:eSaPbMR4T7WfH9FvABk36NBMacoTUKdWCvV0dx+KfOg=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20230803162519-f966b187b2e5/go.mod h1:zBEcrKX2ZOcEkHWxBPAIvYUWOKKMIhYcmNiUIu2ji3I=
+google.golang.org/genproto v0.0.0-20231030173426-d783a09b4405 h1:I6WNifs6pF9tNdSob2W24JtyxIYjzFB9qDlpUC76q+U=
+google.golang.org/genproto v0.0.0-20231030173426-d783a09b4405/go.mod h1:3WDQMjmJk36UQhjQ89emUzb1mdaHcPeeAh4SCBKznB4=
+google.golang.org/genproto/googleapis/api v0.0.0-20231030173426-d783a09b4405 h1:HJMDndgxest5n2y77fnErkM62iUsptE/H8p0dC2Huo4=
+google.golang.org/genproto/googleapis/api v0.0.0-20231030173426-d783a09b4405/go.mod h1:oT32Z4o8Zv2xPQTg0pbVaPr0MPOH6f14RgXt7zfIpwg=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20231030173426-d783a09b4405 h1:AB/lmRny7e2pLhFEYIbl5qkDAUt2h0ZRO4wGPhZf+ik=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20231030173426-d783a09b4405/go.mod h1:67X1fPuzjcrkymZzZV1vvkFeTn2Rvc6lYF9MYFGCcwE=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
 google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
@@ -671,8 +680,8 @@ google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAG
 google.golang.org/grpc v1.36.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
 google.golang.org/grpc v1.40.0/go.mod h1:ogyxbiOoUXAkP+4+xa6PZSE9DZgIHtSpzjDTB9KAK34=
 google.golang.org/grpc v1.41.0/go.mod h1:U3l9uK9J0sini8mHphKoXyaqDA/8VyGnDee1zzIUK6k=
-google.golang.org/grpc v1.57.0 h1:kfzNeI/klCGD2YPMUlaGNT3pxvYfga7smW3Vth8Zsiw=
-google.golang.org/grpc v1.57.0/go.mod h1:Sd+9RMTACXwmub0zcNY2c4arhtrbBYD1AUHI/dt16Mo=
+google.golang.org/grpc v1.59.0 h1:Z5Iec2pjwb+LEOqzpB2MR12/eKFhDPhuqW91O+4bwUk=
+google.golang.org/grpc v1.59.0/go.mod h1:aUPDwccQo6OTjy7Hct4AfBPD1GptF4fyUjIkQ9YtF98=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
diff --git a/services/chaintime/standard/parameters.go b/services/chaintime/standard/parameters.go
index 6118f30..cf22d84 100644
--- a/services/chaintime/standard/parameters.go
+++ b/services/chaintime/standard/parameters.go
@@ -27,7 +27,7 @@ type parameters struct {
 
 // Parameter is the interface for service parameters.
 type Parameter interface {
-	apply(*parameters)
+	apply(p *parameters)
 }
 
 type parameterFunc func(*parameters)
diff --git a/services/chaintime/standard/service.go b/services/chaintime/standard/service.go
index 8ef6dde..47da015 100644
--- a/services/chaintime/standard/service.go
+++ b/services/chaintime/standard/service.go
@@ -55,12 +55,12 @@ func New(ctx context.Context, params ...Parameter) (*Service, error) {
 	}
 	log.Trace().Time("genesis_time", genesisTime).Msg("Obtained genesis time")
 
-	spec, err := parameters.specProvider.Spec(ctx)
+	specResponse, err := parameters.specProvider.Spec(ctx)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to obtain spec")
 	}
 
-	tmp, exists := spec["SECONDS_PER_SLOT"]
+	tmp, exists := specResponse.Data["SECONDS_PER_SLOT"]
 	if !exists {
 		return nil, errors.New("SECONDS_PER_SLOT not found in spec")
 	}
@@ -69,7 +69,7 @@ func New(ctx context.Context, params ...Parameter) (*Service, error) {
 		return nil, errors.New("SECONDS_PER_SLOT of unexpected type")
 	}
 
-	tmp, exists = spec["SLOTS_PER_EPOCH"]
+	tmp, exists = specResponse.Data["SLOTS_PER_EPOCH"]
 	if !exists {
 		return nil, errors.New("SLOTS_PER_EPOCH not found in spec")
 	}
@@ -79,7 +79,7 @@ func New(ctx context.Context, params ...Parameter) (*Service, error) {
 	}
 
 	var epochsPerSyncCommitteePeriod uint64
-	if tmp, exists := spec["EPOCHS_PER_SYNC_COMMITTEE_PERIOD"]; exists {
+	if tmp, exists := specResponse.Data["EPOCHS_PER_SYNC_COMMITTEE_PERIOD"]; exists {
 		tmp2, ok := tmp.(uint64)
 		if !ok {
 			return nil, errors.New("EPOCHS_PER_SYNC_COMMITTEE_PERIOD of unexpected type")
@@ -237,11 +237,11 @@ func fetchAltairForkEpoch(ctx context.Context,
 	error,
 ) {
 	// Fetch the fork version.
-	spec, err := specProvider.Spec(ctx)
+	specResponse, err := specProvider.Spec(ctx)
 	if err != nil {
 		return 0, errors.Wrap(err, "failed to obtain spec")
 	}
-	tmp, exists := spec["ALTAIR_FORK_EPOCH"]
+	tmp, exists := specResponse.Data["ALTAIR_FORK_EPOCH"]
 	if !exists {
 		return 0, errors.New("altair fork version not known by chain")
 	}
@@ -266,11 +266,11 @@ func fetchBellatrixForkEpoch(ctx context.Context,
 	error,
 ) {
 	// Fetch the fork version.
-	spec, err := specProvider.Spec(ctx)
+	specResponse, err := specProvider.Spec(ctx)
 	if err != nil {
 		return 0, errors.Wrap(err, "failed to obtain spec")
 	}
-	tmp, exists := spec["BELLATRIX_FORK_EPOCH"]
+	tmp, exists := specResponse.Data["BELLATRIX_FORK_EPOCH"]
 	if !exists {
 		return 0, errors.New("bellatrix fork version not known by chain")
 	}
@@ -295,11 +295,11 @@ func fetchCapellaForkEpoch(ctx context.Context,
 	error,
 ) {
 	// Fetch the fork version.
-	spec, err := specProvider.Spec(ctx)
+	specResponse, err := specProvider.Spec(ctx)
 	if err != nil {
 		return 0, errors.Wrap(err, "failed to obtain spec")
 	}
-	tmp, exists := spec["CAPELLA_FORK_EPOCH"]
+	tmp, exists := specResponse.Data["CAPELLA_FORK_EPOCH"]
 	if !exists {
 		return 0, errors.New("capella fork version not known by chain")
 	}
@@ -324,11 +324,11 @@ func fetchDenebForkEpoch(ctx context.Context,
 	error,
 ) {
 	// Fetch the fork version.
-	spec, err := specProvider.Spec(ctx)
+	specResponse, err := specProvider.Spec(ctx)
 	if err != nil {
 		return 0, errors.Wrap(err, "failed to obtain spec")
 	}
-	tmp, exists := spec["DENEB_FORK_EPOCH"]
+	tmp, exists := specResponse.Data["DENEB_FORK_EPOCH"]
 	if !exists {
 		return 0, errors.New("deneb fork version not known by chain")
 	}
diff --git a/testing/mock/eth2client.go b/testing/mock/eth2client.go
index 68fa3dd..e01107e 100644
--- a/testing/mock/eth2client.go
+++ b/testing/mock/eth2client.go
@@ -18,7 +18,8 @@ import (
 	"time"
 
 	eth2client "github.com/attestantio/go-eth2-client"
-	api "github.com/attestantio/go-eth2-client/api/v1"
+	"github.com/attestantio/go-eth2-client/api"
+	apiv1 "github.com/attestantio/go-eth2-client/api/v1"
 	"github.com/attestantio/go-eth2-client/spec"
 	"github.com/attestantio/go-eth2-client/spec/phase0"
 )
@@ -42,7 +43,7 @@ func (m *GenesisTimeProvider) GenesisTime(_ context.Context) (time.Time, error)
 
 // SpecProvider is a mock for eth2client.SpecProvider.
 type SpecProvider struct {
-	spec map[string]interface{}
+	spec map[string]any
 }
 
 // NewSpecProvider returns a mock spec provider with the provided values.
@@ -51,7 +52,7 @@ func NewSpecProvider(slotDuration time.Duration,
 	epochsPerSyncCommitteePeriod uint64,
 ) eth2client.SpecProvider {
 	return &SpecProvider{
-		spec: map[string]interface{}{
+		spec: map[string]any{
 			"SECONDS_PER_SLOT":                 slotDuration,
 			"SLOTS_PER_EPOCH":                  slotsPerEpoch,
 			"EPOCHS_PER_SYNC_COMMITTEE_PERIOD": epochsPerSyncCommitteePeriod,
@@ -60,8 +61,11 @@ func NewSpecProvider(slotDuration time.Duration,
 }
 
 // Spec is a mock.
-func (m *SpecProvider) Spec(_ context.Context) (map[string]interface{}, error) {
-	return m.spec, nil
+func (m *SpecProvider) Spec(_ context.Context) (*api.Response[map[string]any], error) {
+	return &api.Response[map[string]any]{
+		Data:     m.spec,
+		Metadata: make(map[string]any),
+	}, nil
 }
 
 // ForkScheduleProvider is a mock for eth2client.ForkScheduleProvider.
@@ -77,8 +81,11 @@ func NewForkScheduleProvider(schedule []*phase0.Fork) eth2client.ForkSchedulePro
 }
 
 // ForkSchedule is a mock.
-func (m *ForkScheduleProvider) ForkSchedule(_ context.Context) ([]*phase0.Fork, error) {
-	return m.schedule, nil
+func (m *ForkScheduleProvider) ForkSchedule(_ context.Context) (*api.Response[[]*phase0.Fork], error) {
+	return &api.Response[[]*phase0.Fork]{
+		Data:     m.schedule,
+		Metadata: make(map[string]any),
+	}, nil
 }
 
 // SlotsPerEpochProvider is a mock for eth2client.SlotsPerEpochProvider.
@@ -146,6 +153,6 @@ func NewBeaconCommitteeSubscriptionsSubmitter() eth2client.BeaconCommitteeSubscr
 }
 
 // SubmitBeaconCommitteeSubscriptions is a mock.
-func (m *BeaconCommitteeSubscriptionsSubmitter) SubmitBeaconCommitteeSubscriptions(_ context.Context, _ []*api.BeaconCommitteeSubscription) error {
+func (m *BeaconCommitteeSubscriptionsSubmitter) SubmitBeaconCommitteeSubscriptions(_ context.Context, _ []*apiv1.BeaconCommitteeSubscription) error {
 	return nil
 }
diff --git a/util/beaconheadercache.go b/util/beaconheadercache.go
index e8e3793..db8f03c 100644
--- a/util/beaconheadercache.go
+++ b/util/beaconheadercache.go
@@ -18,6 +18,7 @@ import (
 	"fmt"
 
 	eth2client "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	apiv1 "github.com/attestantio/go-eth2-client/api/v1"
 	"github.com/attestantio/go-eth2-client/spec/phase0"
 )
@@ -50,18 +51,18 @@ func (b *BeaconBlockHeaderCache) Fetch(ctx context.Context,
 ) {
 	entry, exists := b.entries[slot]
 	if !exists {
-		header, err := b.beaconBlockHeadersProvider.BeaconBlockHeader(ctx, fmt.Sprintf("%d", slot))
+		response, err := b.beaconBlockHeadersProvider.BeaconBlockHeader(ctx, &api.BeaconBlockHeaderOpts{Block: fmt.Sprintf("%d", slot)})
 		if err != nil {
 			return nil, err
 		}
-		if header == nil {
+		if response.Data == nil {
 			entry = &beaconBlockHeaderEntry{
 				present: false,
 			}
 		} else {
 			entry = &beaconBlockHeaderEntry{
 				present: true,
-				value:   header,
+				value:   response.Data,
 			}
 		}
 		b.entries[slot] = entry
diff --git a/util/networks.go b/util/networks.go
index cfab4ca..145fd99 100644
--- a/util/networks.go
+++ b/util/networks.go
@@ -15,7 +15,7 @@ package util
 
 import (
 	"context"
-	"fmt"
+	"encoding/hex"
 
 	eth2client "github.com/attestantio/go-eth2-client"
 	"github.com/pkg/errors"
@@ -45,14 +45,11 @@ func Network(ctx context.Context, eth2Client eth2client.Service) (string, error)
 	if !isProvider {
 		return "", errors.New("client does not provide deposit contract address")
 	}
-	config, err := provider.Spec(ctx)
+	specResponse, err := provider.Spec(ctx)
 	if err != nil {
 		return "", errors.Wrap(err, "failed to obtain chain specification")
 	}
-	if config == nil {
-		return "", errors.New("failed to return chain specification")
-	}
-	depositContractAddress, exists := config["DEPOSIT_CONTRACT_ADDRESS"]
+	depositContractAddress, exists := specResponse.Data["DEPOSIT_CONTRACT_ADDRESS"]
 	if exists {
 		address = depositContractAddress.([]byte)
 	}
@@ -62,7 +59,7 @@ func Network(ctx context.Context, eth2Client eth2client.Service) (string, error)
 
 // network returns a network given an Ethereum 1 contract address.
 func network(address []byte) string {
-	if network, exists := networks[fmt.Sprintf("%x", address)]; exists {
+	if network, exists := networks[hex.EncodeToString(address)]; exists {
 		return network
 	}
 	return "Unknown"
diff --git a/util/networks_test.go b/util/networks_test.go
index 02eeceb..9a0c3de 100644
--- a/util/networks_test.go
+++ b/util/networks_test.go
@@ -18,6 +18,7 @@ import (
 	"testing"
 
 	eth2client "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	"github.com/stretchr/testify/require"
 	"github.com/wealdtech/ethdo/testutil"
 	"github.com/wealdtech/ethdo/util"
@@ -39,9 +40,12 @@ func (c *specETH2Client) Address() string {
 }
 
 // Spec provides the spec information of the chain.
-func (c *specETH2Client) Spec(ctx context.Context) (map[string]interface{}, error) {
-	return map[string]interface{}{
-		"DEPOSIT_CONTRACT_ADDRESS": c.address,
+func (c *specETH2Client) Spec(ctx context.Context) (*api.Response[map[string]any], error) {
+	return &api.Response[map[string]any]{
+		Data: map[string]any{
+			"DEPOSIT_CONTRACT_ADDRESS": c.address,
+		},
+		Metadata: make(map[string]any),
 	}, nil
 }
 
diff --git a/util/validator.go b/util/validator.go
index e368f71..355effa 100644
--- a/util/validator.go
+++ b/util/validator.go
@@ -22,6 +22,7 @@ import (
 	"time"
 
 	consensusclient "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	"github.com/attestantio/go-eth2-client/spec/phase0"
 	"github.com/pkg/errors"
 	e2wtypes "github.com/wealdtech/go-eth2-wallet-types/v2"
@@ -67,12 +68,15 @@ func accountToIndex(ctx context.Context, account e2wtypes.Account, client consen
 
 	pubKeys := make([]phase0.BLSPubKey, 1)
 	copy(pubKeys[0][:], pubKey.Marshal())
-	validators, err := client.(consensusclient.ValidatorsProvider).ValidatorsByPubKey(ctx, "head", pubKeys)
+	validatorsResponse, err := client.(consensusclient.ValidatorsProvider).Validators(ctx, &api.ValidatorsOpts{
+		State:   "head",
+		PubKeys: pubKeys,
+	})
 	if err != nil {
 		return 0, err
 	}
 
-	for index := range validators {
+	for index := range validatorsResponse.Data {
 		return index, nil
 	}
 	return 0, errors.New("validator not found")
diff --git a/util/validators.go b/util/validators.go
index 1f153ba..76a53a7 100644
--- a/util/validators.go
+++ b/util/validators.go
@@ -20,6 +20,7 @@ import (
 	"strings"
 
 	eth2client "github.com/attestantio/go-eth2-client"
+	"github.com/attestantio/go-eth2-client/api"
 	apiv1 "github.com/attestantio/go-eth2-client/api/v1"
 	"github.com/attestantio/go-eth2-client/spec/phase0"
 	"github.com/pkg/errors"
@@ -47,11 +48,11 @@ func ParseValidators(ctx context.Context, validatorsProvider eth2client.Validato
 			for index := low; index <= high; index++ {
 				indices = append(indices, phase0.ValidatorIndex(index))
 			}
-			rangeValidators, err := validatorsProvider.Validators(ctx, stateID, indices)
+			response, err := validatorsProvider.Validators(ctx, &api.ValidatorsOpts{State: stateID, Indices: indices})
 			if err != nil {
 				return nil, errors.Wrap(err, fmt.Sprintf("failed to obtain validators %s", validatorsStr[i]))
 			}
-			for _, validator := range rangeValidators {
+			for _, validator := range response.Data {
 				validators = append(validators, validator)
 			}
 		} else {
@@ -79,10 +80,14 @@ func ParseValidator(ctx context.Context,
 	// Could be a simple index.
 	index, err := strconv.ParseUint(validatorStr, 10, 64)
 	if err == nil {
-		validators, err = validatorsProvider.Validators(ctx, stateID, []phase0.ValidatorIndex{phase0.ValidatorIndex(index)})
+		response, err := validatorsProvider.Validators(ctx, &api.ValidatorsOpts{
+			State:   stateID,
+			Indices: []phase0.ValidatorIndex{phase0.ValidatorIndex(index)},
+		})
 		if err != nil {
 			return nil, errors.Wrap(err, "failed to obtain validator information")
 		}
+		validators = response.Data
 	} else {
 		// Some sort of specifier.
 		account, err := ParseAccount(ctx, validatorStr, nil, false)
@@ -96,13 +101,14 @@ func ParseValidator(ctx context.Context,
 		}
 		pubKey := phase0.BLSPubKey{}
 		copy(pubKey[:], accPubKey.Marshal())
-		validators, err = validatorsProvider.ValidatorsByPubKey(ctx,
-			stateID,
-			[]phase0.BLSPubKey{pubKey},
-		)
+		validatorsResponse, err := validatorsProvider.Validators(ctx, &api.ValidatorsOpts{
+			State:   stateID,
+			PubKeys: []phase0.BLSPubKey{pubKey},
+		})
 		if err != nil {
 			return nil, errors.Wrap(err, "failed to obtain validator information")
 		}
+		validators = validatorsResponse.Data
 	}
 
 	// Validator is first and only entry in the map.