diff --git a/WORKSPACE b/WORKSPACE
index a4b6e7c93f..e38fb7f14f 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -1263,6 +1263,6 @@ go_repository(
 
 go_repository(
     name = "com_github_prysmaticlabs_ethereumapis",
-    commit = "e7364856f1008f08bee3461b6fc2bf6021bd654b",
+    commit = "11bc5ee7ad5de4bf1380f3103eebdd40db99a666",
     importpath = "github.com/prysmaticlabs/ethereumapis",
 )
diff --git a/beacon-chain/operations/service.go b/beacon-chain/operations/service.go
index 4b2c23c819..7e4e6a8b2f 100644
--- a/beacon-chain/operations/service.go
+++ b/beacon-chain/operations/service.go
@@ -25,6 +25,13 @@ import (
 
 var log = logrus.WithField("prefix", "operation")
 
+// Pool defines an interface for fetching the list of attestations
+// which have been observed by the beacon node but not yet included in
+// a beacon block by a proposer.
+type Pool interface {
+	AttestationPool(ctx context.Context) ([]*ethpb.Attestation, error)
+}
+
 // OperationFeeds inteface defines the informational feeds from the operations
 // service.
 type OperationFeeds interface {
@@ -114,10 +121,10 @@ func (s *Service) IncomingProcessedBlockFeed() *event.Feed {
 	return s.incomingProcessedBlockFeed
 }
 
-// PendingAttestations returns the attestations that have not seen on the beacon chain, the attestations are
-// returns in slot ascending order and up to MaxAttestations capacity. The attestations get
-// deleted in DB after they have been retrieved.
-func (s *Service) PendingAttestations(ctx context.Context) ([]*ethpb.Attestation, error) {
+// AttestationPool returns the attestations that have not seen on the beacon chain,
+// the attestations are returned in slot ascending order and up to MaxAttestations
+// capacity. The attestations get deleted in DB after they have been retrieved.
+func (s *Service) AttestationPool(ctx context.Context) ([]*ethpb.Attestation, error) {
 	var attestations []*ethpb.Attestation
 	attestationsFromDB, err := s.beaconDB.Attestations()
 	if err != nil {
@@ -261,35 +268,30 @@ func (s *Service) removeOperations() {
 		// Listen for processed block from the block chain service.
 		case block := <-s.incomingProcessedBlock:
 			handler.SafelyHandleMessage(s.ctx, s.handleProcessedBlock, block)
-			// Removes the pending attestations received from processed block body in DB.
-			if err := s.removePendingAttestations(block.Body.Attestations); err != nil {
-				log.Errorf("Could not remove processed attestations from DB: %v", err)
-				continue
-			}
-			state, err := s.beaconDB.HeadState(s.ctx)
-			if err != nil {
-				log.Errorf("could not retrieve attestations from DB")
-				continue
-			}
-			if err := s.removeEpochOldAttestations(state); err != nil {
-				log.Errorf("Could not remove old attestations from DB at slot %d: %v", block.Slot, err)
-				continue
-			}
 		}
 	}
 }
 
 func (s *Service) handleProcessedBlock(_ context.Context, message proto.Message) error {
 	block := message.(*ethpb.BeaconBlock)
-	// Removes the pending attestations received from processed block body in DB.
-	if err := s.removePendingAttestations(block.Body.Attestations); err != nil {
+	// Removes the attestations from the pool that have been included
+	// in the received block.
+	if err := s.removeAttestationsFromPool(block.Body.Attestations); err != nil {
 		return fmt.Errorf("could not remove processed attestations from DB: %v", err)
 	}
+	state, err := s.beaconDB.HeadState(s.ctx)
+	if err != nil {
+		return fmt.Errorf("could not retrieve attestations from DB")
+	}
+	if err := s.removeEpochOldAttestations(state); err != nil {
+		return fmt.Errorf("could not remove old attestations from DB at slot %d: %v", block.Slot, err)
+	}
 	return nil
 }
 
-// removePendingAttestations removes a list of attestations from DB.
-func (s *Service) removePendingAttestations(attestations []*ethpb.Attestation) error {
+// removeAttestationsFromPool removes a list of attestations from the DB
+// after they have been included in a beacon block.
+func (s *Service) removeAttestationsFromPool(attestations []*ethpb.Attestation) error {
 	for _, attestation := range attestations {
 		hash, err := hashutil.HashProto(attestation)
 		if err != nil {
diff --git a/beacon-chain/operations/service_test.go b/beacon-chain/operations/service_test.go
index 5898b1d894..6a2c452791 100644
--- a/beacon-chain/operations/service_test.go
+++ b/beacon-chain/operations/service_test.go
@@ -22,6 +22,7 @@ import (
 
 // Ensure operations service implements intefaces.
 var _ = OperationFeeds(&Service{})
+var _ = Pool(&Service{})
 
 type mockBroadcaster struct {
 }
@@ -130,7 +131,7 @@ func TestRetrieveAttestations_OK(t *testing.T) {
 		t.Fatal(err)
 	}
 	// Test we can retrieve attestations from slot1 - slot61.
-	attestations, err := service.PendingAttestations(context.Background())
+	attestations, err := service.AttestationPool(context.Background())
 	if err != nil {
 		t.Fatalf("Could not retrieve attestations: %v", err)
 	}
@@ -176,7 +177,7 @@ func TestRetrieveAttestations_PruneInvalidAtts(t *testing.T) {
 			DataRoot:   params.BeaconConfig().ZeroHash[:]}}}); err != nil {
 		t.Fatal(err)
 	}
-	attestations, err := service.PendingAttestations(context.Background())
+	attestations, err := service.AttestationPool(context.Background())
 	if err != nil {
 		t.Fatalf("Could not retrieve attestations: %v", err)
 	}
@@ -223,7 +224,7 @@ func TestRemoveProcessedAttestations_Ok(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	retrievedAtts, err := s.PendingAttestations(context.Background())
+	retrievedAtts, err := s.AttestationPool(context.Background())
 	if err != nil {
 		t.Fatalf("Could not retrieve attestations: %v", err)
 	}
@@ -231,11 +232,11 @@ func TestRemoveProcessedAttestations_Ok(t *testing.T) {
 		t.Error("Retrieved attestations did not match prev generated attestations")
 	}
 
-	if err := s.removePendingAttestations(attestations); err != nil {
-		t.Fatalf("Could not remove pending attestations: %v", err)
+	if err := s.removeAttestationsFromPool(attestations); err != nil {
+		t.Fatalf("Could not remove attestations: %v", err)
 	}
 
-	retrievedAtts, _ = s.PendingAttestations(context.Background())
+	retrievedAtts, _ = s.AttestationPool(context.Background())
 	if len(retrievedAtts) != 0 {
 		t.Errorf("Attestation pool should be empty but got a length of %d", len(retrievedAtts))
 	}
@@ -270,7 +271,7 @@ func TestReceiveBlkRemoveOps_Ok(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	atts, _ := s.PendingAttestations(context.Background())
+	atts, _ := s.AttestationPool(context.Background())
 	if len(atts) != len(attestations) {
 		t.Errorf("Attestation pool should be %d but got a length of %d",
 			len(attestations), len(atts))
@@ -287,7 +288,7 @@ func TestReceiveBlkRemoveOps_Ok(t *testing.T) {
 		t.Error(err)
 	}
 
-	atts, _ = s.PendingAttestations(context.Background())
+	atts, _ = s.AttestationPool(context.Background())
 	if len(atts) != 0 {
 		t.Errorf("Attestation pool should be empty but got a length of %d", len(atts))
 	}
diff --git a/beacon-chain/rpc/BUILD.bazel b/beacon-chain/rpc/BUILD.bazel
index d305ac7bd1..82dabdc841 100644
--- a/beacon-chain/rpc/BUILD.bazel
+++ b/beacon-chain/rpc/BUILD.bazel
@@ -22,6 +22,7 @@ go_library(
         "//beacon-chain/core/state:go_default_library",
         "//beacon-chain/core/state/stateutils:go_default_library",
         "//beacon-chain/db:go_default_library",
+        "//beacon-chain/operations:go_default_library",
         "//beacon-chain/sync:go_default_library",
         "//proto/beacon/p2p/v1:go_default_library",
         "//proto/beacon/rpc/v1:go_default_library",
diff --git a/beacon-chain/rpc/beacon_chain_server.go b/beacon-chain/rpc/beacon_chain_server.go
index 004b12e0e8..eab353ce9e 100644
--- a/beacon-chain/rpc/beacon_chain_server.go
+++ b/beacon-chain/rpc/beacon_chain_server.go
@@ -2,11 +2,13 @@ package rpc
 
 import (
 	"context"
+	"sort"
 
 	ptypes "github.com/gogo/protobuf/types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/epoch"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/beacon-chain/db"
+	"github.com/prysmaticlabs/prysm/beacon-chain/operations"
 	ethpb "github.com/prysmaticlabs/prysm/proto/eth/v1alpha1"
 	"github.com/prysmaticlabs/prysm/shared/pagination"
 	"github.com/prysmaticlabs/prysm/shared/params"
@@ -19,32 +21,82 @@ import (
 // beacon chain.
 type BeaconChainServer struct {
 	beaconDB *db.BeaconDB
+	pool     operations.Pool
+}
+
+// sortableAttestations implements the Sort interface to sort attestations
+// by shard as the canonical sorting attribute.
+type sortableAttestations []*ethpb.Attestation
+
+func (s sortableAttestations) Len() int      { return len(s) }
+func (s sortableAttestations) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
+func (s sortableAttestations) Less(i, j int) bool {
+	return s[i].Data.Crosslink.Shard < s[j].Data.Crosslink.Shard
 }
 
 // ListAttestations retrieves attestations by block root, slot, or epoch.
+// Attestations are sorted by crosslink shard by default.
 //
 // The server may return an empty list when no attestations match the given
 // filter criteria. This RPC should not return NOT_FOUND. Only one filter
 // criteria should be used.
+//
+// TODO(#3064): Filtering blocked by DB refactor for easier access to
+// fetching data by attributes efficiently.
 func (bs *BeaconChainServer) ListAttestations(
 	ctx context.Context, req *ethpb.ListAttestationsRequest,
 ) (*ethpb.ListAttestationsResponse, error) {
-	return nil, status.Error(codes.Unimplemented, "not implemented")
+	if int(req.PageSize) > params.BeaconConfig().MaxPageSize {
+		return nil, status.Errorf(codes.InvalidArgument, "requested page size %d can not be greater than max size %d",
+			req.PageSize, params.BeaconConfig().MaxPageSize)
+	}
+
+	switch req.QueryFilter.(type) {
+	case *ethpb.ListAttestationsRequest_BlockRoot:
+		return nil, status.Error(codes.Unimplemented, "not implemented")
+	case *ethpb.ListAttestationsRequest_Slot:
+		return nil, status.Error(codes.Unimplemented, "not implemented")
+	case *ethpb.ListAttestationsRequest_Epoch:
+		return nil, status.Error(codes.Unimplemented, "not implemented")
+	}
+	atts, err := bs.beaconDB.Attestations()
+	if err != nil {
+		return nil, status.Errorf(codes.Internal, "could not fetch attestations: %v", err)
+	}
+	// We sort attestations according to the Sortable interface.
+	sort.Sort(sortableAttestations(atts))
+	numAttestations := len(atts)
+
+	start, end, nextPageToken, err := pagination.StartAndEndPage(req.PageToken, int(req.PageSize), numAttestations)
+	if err != nil {
+		return nil, status.Errorf(codes.Internal, "could not paginate attestations: %v", err)
+	}
+	return &ethpb.ListAttestationsResponse{
+		Attestations:  atts[start:end],
+		TotalSize:     int32(numAttestations),
+		NextPageToken: nextPageToken,
+	}, nil
 }
 
 // AttestationPool retrieves pending attestations.
 //
 // The server returns a list of attestations that have been seen but not
-// yet processed. Pending attestations eventually expire as the slot
+// yet processed. Pool attestations eventually expire as the slot
 // advances, so an attestation missing from this request does not imply
 // that it was included in a block. The attestation may have expired.
 // Refer to the ethereum 2.0 specification for more details on how
 // attestations are processed and when they are no longer valid.
-// https://github.com/ethereum/eth2.0-specs/blob/dev/specs/core/0_beacon-chain.md#attestation
+// https://github.com/ethereum/eth2.0-specs/blob/dev/specs/core/0_beacon-chain.md#attestations
 func (bs *BeaconChainServer) AttestationPool(
 	ctx context.Context, _ *ptypes.Empty,
 ) (*ethpb.AttestationPoolResponse, error) {
-	return nil, status.Error(codes.Unimplemented, "not implemented")
+	atts, err := bs.pool.AttestationPool(ctx)
+	if err != nil {
+		return nil, status.Errorf(codes.Internal, "could not fetch attestations: %v", err)
+	}
+	return &ethpb.AttestationPoolResponse{
+		Attestations: atts,
+	}, nil
 }
 
 // ListBlocks retrieves blocks by root, slot, or epoch.
diff --git a/beacon-chain/rpc/beacon_chain_server_test.go b/beacon-chain/rpc/beacon_chain_server_test.go
index 7902c99031..10c6eec806 100644
--- a/beacon-chain/rpc/beacon_chain_server_test.go
+++ b/beacon-chain/rpc/beacon_chain_server_test.go
@@ -9,6 +9,7 @@ import (
 	"testing"
 
 	"github.com/gogo/protobuf/proto"
+	ptypes "github.com/gogo/protobuf/types"
 	"github.com/prysmaticlabs/go-bitfield"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/beacon-chain/internal"
@@ -17,6 +18,253 @@ import (
 	"github.com/prysmaticlabs/prysm/shared/params"
 )
 
+type mockPool struct{}
+
+func (m *mockPool) AttestationPool(ctx context.Context) ([]*ethpb.Attestation, error) {
+	return []*ethpb.Attestation{
+		{
+			Data: &ethpb.AttestationData{
+				BeaconBlockRoot: []byte("1"),
+			},
+		},
+		{
+			Data: &ethpb.AttestationData{
+				BeaconBlockRoot: []byte("2"),
+			},
+		},
+	}, nil
+}
+
+func TestBeaconChainServer_ListAttestationsNoPagination(t *testing.T) {
+	db := internal.SetupDB(t)
+	defer internal.TeardownDB(t, db)
+	ctx := context.Background()
+
+	count := uint64(10)
+	atts := make([]*ethpb.Attestation, 0, count)
+	for i := uint64(0); i < count; i++ {
+		attExample := &ethpb.Attestation{
+			Data: &ethpb.AttestationData{
+				Crosslink: &ethpb.Crosslink{
+					Shard: i,
+				},
+			},
+		}
+		if err := db.SaveAttestation(ctx, attExample); err != nil {
+			t.Fatal(err)
+		}
+		atts = append(atts, attExample)
+	}
+
+	bs := &BeaconChainServer{
+		beaconDB: db,
+	}
+
+	received, err := bs.ListAttestations(ctx, &ethpb.ListAttestationsRequest{})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if !reflect.DeepEqual(atts, received.Attestations) {
+		t.Fatalf("incorrect attestations response: wanted %v, received %v", atts, received.Attestations)
+	}
+}
+
+func TestBeaconChainServer_ListAttestationsPagination(t *testing.T) {
+	db := internal.SetupDB(t)
+	defer internal.TeardownDB(t, db)
+	ctx := context.Background()
+
+	count := uint64(100)
+	atts := make([]*ethpb.Attestation, 0, count)
+	for i := uint64(0); i < count; i++ {
+		attExample := &ethpb.Attestation{
+			Data: &ethpb.AttestationData{
+				Crosslink: &ethpb.Crosslink{
+					Shard: i,
+				},
+			},
+		}
+		if err := db.SaveAttestation(ctx, attExample); err != nil {
+			t.Fatal(err)
+		}
+		atts = append(atts, attExample)
+	}
+
+	bs := &BeaconChainServer{
+		beaconDB: db,
+	}
+
+	tests := []struct {
+		req *ethpb.ListAttestationsRequest
+		res *ethpb.ListAttestationsResponse
+	}{
+		{req: &ethpb.ListAttestationsRequest{PageToken: strconv.Itoa(1), PageSize: 3},
+			res: &ethpb.ListAttestationsResponse{
+				Attestations: []*ethpb.Attestation{
+					{Data: &ethpb.AttestationData{
+						Crosslink: &ethpb.Crosslink{Shard: 3},
+					}},
+					{Data: &ethpb.AttestationData{
+						Crosslink: &ethpb.Crosslink{Shard: 4},
+					}},
+					{Data: &ethpb.AttestationData{
+						Crosslink: &ethpb.Crosslink{Shard: 5},
+					}},
+				},
+				NextPageToken: strconv.Itoa(2),
+				TotalSize:     int32(count)}},
+		{req: &ethpb.ListAttestationsRequest{PageToken: strconv.Itoa(10), PageSize: 5},
+			res: &ethpb.ListAttestationsResponse{
+				Attestations: []*ethpb.Attestation{
+					{Data: &ethpb.AttestationData{
+						Crosslink: &ethpb.Crosslink{Shard: 50},
+					}},
+					{Data: &ethpb.AttestationData{
+						Crosslink: &ethpb.Crosslink{Shard: 51},
+					}},
+					{Data: &ethpb.AttestationData{
+						Crosslink: &ethpb.Crosslink{Shard: 52},
+					}},
+					{Data: &ethpb.AttestationData{
+						Crosslink: &ethpb.Crosslink{Shard: 53},
+					}},
+					{Data: &ethpb.AttestationData{
+						Crosslink: &ethpb.Crosslink{Shard: 54},
+					}},
+				},
+				NextPageToken: strconv.Itoa(11),
+				TotalSize:     int32(count)}},
+		{req: &ethpb.ListAttestationsRequest{PageToken: strconv.Itoa(33), PageSize: 3},
+			res: &ethpb.ListAttestationsResponse{
+				Attestations: []*ethpb.Attestation{
+					{Data: &ethpb.AttestationData{
+						Crosslink: &ethpb.Crosslink{Shard: 99},
+					}},
+				},
+				NextPageToken: strconv.Itoa(34),
+				TotalSize:     int32(count)}},
+		{req: &ethpb.ListAttestationsRequest{PageSize: 2},
+			res: &ethpb.ListAttestationsResponse{
+				Attestations: []*ethpb.Attestation{
+					{Data: &ethpb.AttestationData{
+						Crosslink: &ethpb.Crosslink{Shard: 0},
+					}},
+					{Data: &ethpb.AttestationData{
+						Crosslink: &ethpb.Crosslink{Shard: 1},
+					}},
+				},
+				NextPageToken: strconv.Itoa(1),
+				TotalSize:     int32(count)}},
+	}
+	for _, test := range tests {
+		res, err := bs.ListAttestations(ctx, test.req)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if !proto.Equal(res, test.res) {
+			t.Error("Incorrect attestations response")
+		}
+	}
+}
+
+func TestBeaconChainServer_ListAttestationsPaginationOutOfRange(t *testing.T) {
+	db := internal.SetupDB(t)
+	defer internal.TeardownDB(t, db)
+	ctx := context.Background()
+
+	count := uint64(1)
+	atts := make([]*ethpb.Attestation, 0, count)
+	for i := uint64(0); i < count; i++ {
+		attExample := &ethpb.Attestation{
+			Data: &ethpb.AttestationData{
+				Crosslink: &ethpb.Crosslink{
+					Shard: i,
+				},
+			},
+		}
+		if err := db.SaveAttestation(ctx, attExample); err != nil {
+			t.Fatal(err)
+		}
+		atts = append(atts, attExample)
+	}
+
+	bs := &BeaconChainServer{
+		beaconDB: db,
+	}
+
+	req := &ethpb.ListAttestationsRequest{PageToken: strconv.Itoa(1), PageSize: 100}
+	wanted := fmt.Sprintf("page start %d >= list %d", req.PageSize, len(atts))
+	if _, err := bs.ListAttestations(ctx, req); !strings.Contains(err.Error(), wanted) {
+		t.Errorf("Expected error %v, received %v", wanted, err)
+	}
+}
+
+func TestBeaconChainServer_ListAttestationsExceedsMaxPageSize(t *testing.T) {
+	ctx := context.Background()
+	bs := &BeaconChainServer{}
+	exceedsMax := int32(params.BeaconConfig().MaxPageSize + 1)
+
+	wanted := fmt.Sprintf("requested page size %d can not be greater than max size %d", exceedsMax, params.BeaconConfig().MaxPageSize)
+	req := &ethpb.ListAttestationsRequest{PageToken: strconv.Itoa(0), PageSize: exceedsMax}
+	if _, err := bs.ListAttestations(ctx, req); !strings.Contains(err.Error(), wanted) {
+		t.Errorf("Expected error %v, received %v", wanted, err)
+	}
+}
+
+func TestBeaconChainServer_ListAttestationsDefaultPageSize(t *testing.T) {
+	db := internal.SetupDB(t)
+	defer internal.TeardownDB(t, db)
+	ctx := context.Background()
+
+	count := uint64(params.BeaconConfig().DefaultPageSize)
+	atts := make([]*ethpb.Attestation, 0, count)
+	for i := uint64(0); i < count; i++ {
+		attExample := &ethpb.Attestation{
+			Data: &ethpb.AttestationData{
+				Crosslink: &ethpb.Crosslink{
+					Shard: i,
+				},
+			},
+		}
+		if err := db.SaveAttestation(ctx, attExample); err != nil {
+			t.Fatal(err)
+		}
+		atts = append(atts, attExample)
+	}
+
+	bs := &BeaconChainServer{
+		beaconDB: db,
+	}
+
+	req := &ethpb.ListAttestationsRequest{}
+	res, err := bs.ListAttestations(ctx, req)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	i := 0
+	j := params.BeaconConfig().DefaultPageSize
+	if !reflect.DeepEqual(res.Attestations, atts[i:j]) {
+		t.Error("Incorrect attestations response")
+	}
+}
+
+func TestBeaconChainServer_AttestationPool(t *testing.T) {
+	ctx := context.Background()
+	bs := &BeaconChainServer{
+		pool: &mockPool{},
+	}
+	res, err := bs.AttestationPool(ctx, &ptypes.Empty{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	want, _ := bs.pool.AttestationPool(ctx)
+	if !reflect.DeepEqual(res.Attestations, want) {
+		t.Errorf("Wanted AttestationPool() = %v, received %v", want, res.Attestations)
+	}
+}
+
 func TestBeaconChainServer_ListValidatorBalances(t *testing.T) {
 	db := internal.SetupDB(t)
 	defer internal.TeardownDB(t, db)
@@ -142,7 +390,6 @@ func TestBeaconChainServer_GetValidatorsNoPagination(t *testing.T) {
 	}
 
 	if !reflect.DeepEqual(validators, received.Validators) {
-		fmt.Println(received.Validators)
 		t.Fatal("Incorrect respond of validators")
 	}
 }
@@ -243,7 +490,7 @@ func TestBeaconChainServer_GetValidatorsPaginationOutOfRange(t *testing.T) {
 	}
 
 	req := &ethpb.GetValidatorsRequest{PageToken: strconv.Itoa(1), PageSize: 100}
-	wanted := fmt.Sprintf("page start %d >= validator list %d", req.PageSize, len(validators))
+	wanted := fmt.Sprintf("page start %d >= list %d", req.PageSize, len(validators))
 	if _, err := bs.GetValidators(context.Background(), req); !strings.Contains(err.Error(), wanted) {
 		t.Errorf("Expected error %v, received %v", wanted, err)
 	}
@@ -317,7 +564,7 @@ func TestBeaconChainServer_ListAssignmentsInputOutOfRange(t *testing.T) {
 
 	bs := &BeaconChainServer{beaconDB: db}
 
-	wanted := fmt.Sprintf("page start %d >= validator list %d", 0, 0)
+	wanted := fmt.Sprintf("page start %d >= list %d", 0, 0)
 	if _, err := bs.ListValidatorAssignments(context.Background(), &ethpb.ListValidatorAssignmentsRequest{Epoch: 0}); !strings.Contains(err.Error(), wanted) {
 		t.Errorf("Expected error %v, received %v", wanted, err)
 	}
diff --git a/beacon-chain/rpc/proposer_server.go b/beacon-chain/rpc/proposer_server.go
index ca7dde3dac..d25fc1c7f2 100644
--- a/beacon-chain/rpc/proposer_server.go
+++ b/beacon-chain/rpc/proposer_server.go
@@ -138,9 +138,9 @@ func (ps *ProposerServer) attestations(ctx context.Context, expectedSlot uint64)
 	if err != nil {
 		return nil, fmt.Errorf("could not retrieve beacon state: %v", err)
 	}
-	atts, err := ps.operationService.PendingAttestations(ctx)
+	atts, err := ps.operationService.AttestationPool(ctx)
 	if err != nil {
-		return nil, fmt.Errorf("could not retrieve pending attest ations from operations service: %v", err)
+		return nil, fmt.Errorf("could not retrieve pending attestations from operations service: %v", err)
 	}
 	// advance slot, if it is behind
 	if beaconState.Slot < expectedSlot {
diff --git a/beacon-chain/rpc/service.go b/beacon-chain/rpc/service.go
index 1117f4b50f..e1c8496812 100644
--- a/beacon-chain/rpc/service.go
+++ b/beacon-chain/rpc/service.go
@@ -16,6 +16,7 @@ import (
 	"github.com/prysmaticlabs/prysm/beacon-chain/blockchain"
 	"github.com/prysmaticlabs/prysm/beacon-chain/cache"
 	"github.com/prysmaticlabs/prysm/beacon-chain/db"
+	"github.com/prysmaticlabs/prysm/beacon-chain/operations"
 	"github.com/prysmaticlabs/prysm/beacon-chain/sync"
 	pbp2p "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
 	pb "github.com/prysmaticlabs/prysm/proto/beacon/rpc/v1"
@@ -45,7 +46,7 @@ type chainService interface {
 }
 
 type operationService interface {
-	PendingAttestations(ctx context.Context) ([]*ethpb.Attestation, error)
+	operations.Pool
 	IsAttCanonical(ctx context.Context, att *ethpb.Attestation) (bool, error)
 	HandleAttestations(context.Context, proto.Message) error
 	IncomingAttFeed() *event.Feed
@@ -199,6 +200,7 @@ func (s *Service) Start() {
 	}
 	beaconChainServer := &BeaconChainServer{
 		beaconDB: s.beaconDB,
+		pool:     s.operationService,
 	}
 	pb.RegisterBeaconServiceServer(s.grpcServer, beaconServer)
 	pb.RegisterProposerServiceServer(s.grpcServer, proposerServer)
diff --git a/beacon-chain/rpc/service_test.go b/beacon-chain/rpc/service_test.go
index a7d1ca8d75..c4e18296b8 100644
--- a/beacon-chain/rpc/service_test.go
+++ b/beacon-chain/rpc/service_test.go
@@ -43,7 +43,7 @@ func (ms *mockOperationService) IsAttCanonical(_ context.Context, att *ethpb.Att
 	return true, nil
 }
 
-func (ms *mockOperationService) PendingAttestations(_ context.Context) ([]*ethpb.Attestation, error) {
+func (ms *mockOperationService) AttestationPool(_ context.Context) ([]*ethpb.Attestation, error) {
 	if ms.pendingAttestations != nil {
 		return ms.pendingAttestations, nil
 	}
diff --git a/proto/eth/v1alpha1/beacon_chain.pb.go b/proto/eth/v1alpha1/beacon_chain.pb.go
index 78289d9acd..f3744ac1d1 100755
--- a/proto/eth/v1alpha1/beacon_chain.pb.go
+++ b/proto/eth/v1alpha1/beacon_chain.pb.go
@@ -34,6 +34,8 @@ type ListAttestationsRequest struct {
 	//	*ListAttestationsRequest_Slot
 	//	*ListAttestationsRequest_Epoch
 	QueryFilter          isListAttestationsRequest_QueryFilter `protobuf_oneof:"query_filter"`
+	PageSize             int32                                 `protobuf:"varint,4,opt,name=page_size,json=pageSize,proto3" json:"page_size,omitempty"`
+	PageToken            string                                `protobuf:"bytes,5,opt,name=page_token,json=pageToken,proto3" json:"page_token,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}                              `json:"-"`
 	XXX_unrecognized     []byte                                `json:"-"`
 	XXX_sizecache        int32                                 `json:"-"`
@@ -120,6 +122,20 @@ func (m *ListAttestationsRequest) GetEpoch() uint64 {
 	return 0
 }
 
+func (m *ListAttestationsRequest) GetPageSize() int32 {
+	if m != nil {
+		return m.PageSize
+	}
+	return 0
+}
+
+func (m *ListAttestationsRequest) GetPageToken() string {
+	if m != nil {
+		return m.PageToken
+	}
+	return ""
+}
+
 // XXX_OneofFuncs is for the internal use of the proto package.
 func (*ListAttestationsRequest) XXX_OneofFuncs() (func(msg proto.Message, b *proto.Buffer) error, func(msg proto.Message, tag, wire int, b *proto.Buffer) (bool, error), func(msg proto.Message) (n int), []interface{}) {
 	return _ListAttestationsRequest_OneofMarshaler, _ListAttestationsRequest_OneofUnmarshaler, _ListAttestationsRequest_OneofSizer, []interface{}{
@@ -201,6 +217,8 @@ func _ListAttestationsRequest_OneofSizer(msg proto.Message) (n int) {
 
 type ListAttestationsResponse struct {
 	Attestations         []*Attestation `protobuf:"bytes,1,rep,name=attestations,proto3" json:"attestations,omitempty"`
+	NextPageToken        string         `protobuf:"bytes,2,opt,name=next_page_token,json=nextPageToken,proto3" json:"next_page_token,omitempty"`
+	TotalSize            int32          `protobuf:"varint,3,opt,name=total_size,json=totalSize,proto3" json:"total_size,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}       `json:"-"`
 	XXX_unrecognized     []byte         `json:"-"`
 	XXX_sizecache        int32          `json:"-"`
@@ -246,12 +264,28 @@ func (m *ListAttestationsResponse) GetAttestations() []*Attestation {
 	return nil
 }
 
+func (m *ListAttestationsResponse) GetNextPageToken() string {
+	if m != nil {
+		return m.NextPageToken
+	}
+	return ""
+}
+
+func (m *ListAttestationsResponse) GetTotalSize() int32 {
+	if m != nil {
+		return m.TotalSize
+	}
+	return 0
+}
+
 type ListBlocksRequest struct {
 	// Types that are valid to be assigned to QueryFilter:
 	//	*ListBlocksRequest_Root
 	//	*ListBlocksRequest_Slot
 	//	*ListBlocksRequest_Epoch
 	QueryFilter          isListBlocksRequest_QueryFilter `protobuf_oneof:"query_filter"`
+	PageSize             int32                           `protobuf:"varint,4,opt,name=page_size,json=pageSize,proto3" json:"page_size,omitempty"`
+	PageToken            string                          `protobuf:"bytes,5,opt,name=page_token,json=pageToken,proto3" json:"page_token,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}                        `json:"-"`
 	XXX_unrecognized     []byte                          `json:"-"`
 	XXX_sizecache        int32                           `json:"-"`
@@ -338,6 +372,20 @@ func (m *ListBlocksRequest) GetEpoch() uint64 {
 	return 0
 }
 
+func (m *ListBlocksRequest) GetPageSize() int32 {
+	if m != nil {
+		return m.PageSize
+	}
+	return 0
+}
+
+func (m *ListBlocksRequest) GetPageToken() string {
+	if m != nil {
+		return m.PageToken
+	}
+	return ""
+}
+
 // XXX_OneofFuncs is for the internal use of the proto package.
 func (*ListBlocksRequest) XXX_OneofFuncs() (func(msg proto.Message, b *proto.Buffer) error, func(msg proto.Message, tag, wire int, b *proto.Buffer) (bool, error), func(msg proto.Message) (n int), []interface{}) {
 	return _ListBlocksRequest_OneofMarshaler, _ListBlocksRequest_OneofUnmarshaler, _ListBlocksRequest_OneofSizer, []interface{}{
@@ -419,6 +467,8 @@ func _ListBlocksRequest_OneofSizer(msg proto.Message) (n int) {
 
 type ListBlocksResponse struct {
 	Blocks               []*BeaconBlock `protobuf:"bytes,1,rep,name=blocks,proto3" json:"blocks,omitempty"`
+	NextPageToken        string         `protobuf:"bytes,2,opt,name=next_page_token,json=nextPageToken,proto3" json:"next_page_token,omitempty"`
+	TotalSize            int32          `protobuf:"varint,3,opt,name=total_size,json=totalSize,proto3" json:"total_size,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}       `json:"-"`
 	XXX_unrecognized     []byte         `json:"-"`
 	XXX_sizecache        int32          `json:"-"`
@@ -464,6 +514,20 @@ func (m *ListBlocksResponse) GetBlocks() []*BeaconBlock {
 	return nil
 }
 
+func (m *ListBlocksResponse) GetNextPageToken() string {
+	if m != nil {
+		return m.NextPageToken
+	}
+	return ""
+}
+
+func (m *ListBlocksResponse) GetTotalSize() int32 {
+	if m != nil {
+		return m.TotalSize
+	}
+	return 0
+}
+
 type ChainHead struct {
 	BlockRoot                  []byte   `protobuf:"bytes,1,opt,name=block_root,json=blockRoot,proto3" json:"block_root,omitempty" ssz-size:"32"`
 	BlockSlot                  uint64   `protobuf:"varint,2,opt,name=block_slot,json=blockSlot,proto3" json:"block_slot,omitempty"`
@@ -1587,101 +1651,103 @@ func init() {
 }
 
 var fileDescriptor_678c88b69c3c78d4 = []byte{
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+	0x8e, 0x60, 0x3a, 0x09, 0x21, 0x98, 0x54, 0xd2, 0xca, 0x6a, 0xb5, 0x1f, 0x55, 0xca, 0x3c, 0xad,
+	0xb6, 0x12, 0x30, 0x1e, 0xab, 0x30, 0x5f, 0xe9, 0xff, 0x2a, 0xba, 0xde, 0xd1, 0x37, 0x7a, 0x1c,
+	0x9d, 0x1e, 0x63, 0x49, 0xfe, 0xd2, 0x5f, 0xb8, 0xb0, 0x8d, 0xcb, 0x0a, 0xe9, 0x1a, 0xbe, 0x90,
+	0x4e, 0x58, 0x02, 0xd2, 0xd7, 0x08, 0xce, 0xa4, 0x5e, 0x5a, 0xf8, 0x7f, 0x03, 0x7c, 0xe1, 0x6e,
+	0xd7, 0x5c, 0xfe, 0x4a, 0x3f, 0xc4, 0x6d, 0x56, 0x69, 0xcd, 0x2b, 0x81, 0xb9, 0xed, 0x22, 0xab,
+	0x6c, 0xfd, 0xf4, 0x7c, 0x19, 0x3d, 0x7d, 0xbe, 0x8c, 0x7e, 0x7d, 0xbe, 0x8c, 0xde, 0xfe, 0x6f,
+	0xe2, 0x1f, 0x3b, 0xd7, 0x3b, 0x14, 0x4d, 0x22, 0x99, 0x65, 0x93, 0x9a, 0x08, 0x56, 0xe5, 0xe3,
+	0xff, 0x8c, 0xdd, 0xa2, 0xb2, 0x51, 0x3b, 0xa9, 0xe4, 0xd7, 0xfe, 0x0c, 0x00, 0x00, 0xff, 0xff,
+	0x48, 0x72, 0x96, 0xde, 0x2f, 0x14, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -2075,6 +2141,17 @@ func (m *ListAttestationsRequest) MarshalTo(dAtA []byte) (int, error) {
 		}
 		i += nn1
 	}
+	if m.PageSize != 0 {
+		dAtA[i] = 0x20
+		i++
+		i = encodeVarintBeaconChain(dAtA, i, uint64(m.PageSize))
+	}
+	if len(m.PageToken) > 0 {
+		dAtA[i] = 0x2a
+		i++
+		i = encodeVarintBeaconChain(dAtA, i, uint64(len(m.PageToken)))
+		i += copy(dAtA[i:], m.PageToken)
+	}
 	if m.XXX_unrecognized != nil {
 		i += copy(dAtA[i:], m.XXX_unrecognized)
 	}
@@ -2132,6 +2209,17 @@ func (m *ListAttestationsResponse) MarshalTo(dAtA []byte) (int, error) {
 			i += n
 		}
 	}
+	if len(m.NextPageToken) > 0 {
+		dAtA[i] = 0x12
+		i++
+		i = encodeVarintBeaconChain(dAtA, i, uint64(len(m.NextPageToken)))
+		i += copy(dAtA[i:], m.NextPageToken)
+	}
+	if m.TotalSize != 0 {
+		dAtA[i] = 0x18
+		i++
+		i = encodeVarintBeaconChain(dAtA, i, uint64(m.TotalSize))
+	}
 	if m.XXX_unrecognized != nil {
 		i += copy(dAtA[i:], m.XXX_unrecognized)
 	}
@@ -2160,6 +2248,17 @@ func (m *ListBlocksRequest) MarshalTo(dAtA []byte) (int, error) {
 		}
 		i += nn2
 	}
+	if m.PageSize != 0 {
+		dAtA[i] = 0x20
+		i++
+		i = encodeVarintBeaconChain(dAtA, i, uint64(m.PageSize))
+	}
+	if len(m.PageToken) > 0 {
+		dAtA[i] = 0x2a
+		i++
+		i = encodeVarintBeaconChain(dAtA, i, uint64(len(m.PageToken)))
+		i += copy(dAtA[i:], m.PageToken)
+	}
 	if m.XXX_unrecognized != nil {
 		i += copy(dAtA[i:], m.XXX_unrecognized)
 	}
@@ -2217,6 +2316,17 @@ func (m *ListBlocksResponse) MarshalTo(dAtA []byte) (int, error) {
 			i += n
 		}
 	}
+	if len(m.NextPageToken) > 0 {
+		dAtA[i] = 0x12
+		i++
+		i = encodeVarintBeaconChain(dAtA, i, uint64(len(m.NextPageToken)))
+		i += copy(dAtA[i:], m.NextPageToken)
+	}
+	if m.TotalSize != 0 {
+		dAtA[i] = 0x18
+		i++
+		i = encodeVarintBeaconChain(dAtA, i, uint64(m.TotalSize))
+	}
 	if m.XXX_unrecognized != nil {
 		i += copy(dAtA[i:], m.XXX_unrecognized)
 	}
@@ -2938,6 +3048,13 @@ func (m *ListAttestationsRequest) Size() (n int) {
 	if m.QueryFilter != nil {
 		n += m.QueryFilter.Size()
 	}
+	if m.PageSize != 0 {
+		n += 1 + sovBeaconChain(uint64(m.PageSize))
+	}
+	l = len(m.PageToken)
+	if l > 0 {
+		n += 1 + l + sovBeaconChain(uint64(l))
+	}
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -2986,6 +3103,13 @@ func (m *ListAttestationsResponse) Size() (n int) {
 			n += 1 + l + sovBeaconChain(uint64(l))
 		}
 	}
+	l = len(m.NextPageToken)
+	if l > 0 {
+		n += 1 + l + sovBeaconChain(uint64(l))
+	}
+	if m.TotalSize != 0 {
+		n += 1 + sovBeaconChain(uint64(m.TotalSize))
+	}
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -3001,6 +3125,13 @@ func (m *ListBlocksRequest) Size() (n int) {
 	if m.QueryFilter != nil {
 		n += m.QueryFilter.Size()
 	}
+	if m.PageSize != 0 {
+		n += 1 + sovBeaconChain(uint64(m.PageSize))
+	}
+	l = len(m.PageToken)
+	if l > 0 {
+		n += 1 + l + sovBeaconChain(uint64(l))
+	}
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -3049,6 +3180,13 @@ func (m *ListBlocksResponse) Size() (n int) {
 			n += 1 + l + sovBeaconChain(uint64(l))
 		}
 	}
+	l = len(m.NextPageToken)
+	if l > 0 {
+		n += 1 + l + sovBeaconChain(uint64(l))
+	}
+	if m.TotalSize != 0 {
+		n += 1 + sovBeaconChain(uint64(m.TotalSize))
+	}
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -3576,6 +3714,57 @@ func (m *ListAttestationsRequest) Unmarshal(dAtA []byte) error {
 				}
 			}
 			m.QueryFilter = &ListAttestationsRequest_Epoch{v}
+		case 4:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field PageSize", wireType)
+			}
+			m.PageSize = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowBeaconChain
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.PageSize |= int32(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 5:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field PageToken", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowBeaconChain
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthBeaconChain
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthBeaconChain
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.PageToken = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipBeaconChain(dAtA[iNdEx:])
@@ -3664,6 +3853,57 @@ func (m *ListAttestationsResponse) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field NextPageToken", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowBeaconChain
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthBeaconChain
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthBeaconChain
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.NextPageToken = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 3:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field TotalSize", wireType)
+			}
+			m.TotalSize = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowBeaconChain
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.TotalSize |= int32(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		default:
 			iNdEx = preIndex
 			skippy, err := skipBeaconChain(dAtA[iNdEx:])
@@ -3791,6 +4031,57 @@ func (m *ListBlocksRequest) Unmarshal(dAtA []byte) error {
 				}
 			}
 			m.QueryFilter = &ListBlocksRequest_Epoch{v}
+		case 4:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field PageSize", wireType)
+			}
+			m.PageSize = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowBeaconChain
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.PageSize |= int32(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 5:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field PageToken", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowBeaconChain
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthBeaconChain
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthBeaconChain
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.PageToken = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipBeaconChain(dAtA[iNdEx:])
@@ -3879,6 +4170,57 @@ func (m *ListBlocksResponse) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field NextPageToken", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowBeaconChain
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthBeaconChain
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthBeaconChain
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.NextPageToken = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 3:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field TotalSize", wireType)
+			}
+			m.TotalSize = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowBeaconChain
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.TotalSize |= int32(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		default:
 			iNdEx = preIndex
 			skippy, err := skipBeaconChain(dAtA[iNdEx:])
diff --git a/proto/eth/v1alpha1/beacon_chain.proto b/proto/eth/v1alpha1/beacon_chain.proto
index 72077526d1..419fd42d34 100644
--- a/proto/eth/v1alpha1/beacon_chain.proto
+++ b/proto/eth/v1alpha1/beacon_chain.proto
@@ -20,6 +20,7 @@ service BeaconChain {
     // TODO(preston): Batch requests?
 
     // Retrieve attestations by block root, slot, or epoch. 
+    // Attestations are sorted by crosslink shard by default.
     // 
     // The server may return an empty list when no attestations match the given 
     // filter criteria. This RPC should not return NOT_FOUND. Only one filter 
@@ -138,10 +139,27 @@ message ListAttestationsRequest {
         // Filter attestations by epoch number.
         uint64 epoch = 3;
     }
+
+    // The maximum number of Attestations to return in the response.
+    // This field is optional.
+    int32 page_size = 4;
+
+    // A pagination token returned from a previous call to `ListAttestations`
+    // that indicates where this listing should continue from.
+    // This field is optional.
+    string page_token = 5;
 }
 
 message ListAttestationsResponse {
     repeated Attestation attestations = 1;
+
+    // A pagination token returned from a previous call to `ListAttestations`
+    // that indicates from where listing should continue.
+    // This field is optional.
+    string next_page_token = 2;
+
+    // Total count of Attestations matching the request filter.
+    int32 total_size = 3;
 }
 
 message ListBlocksRequest {
@@ -159,10 +177,27 @@ message ListBlocksRequest {
         // from another fork.
         uint64 epoch = 3;
     }
+
+    // The maximum number of Blocks to return in the response.
+    // This field is optional.
+    int32 page_size = 4;
+
+    // A pagination token returned from a previous call to `ListBlocks`
+    // that indicates where this listing should continue from.
+    // This field is optional.
+    string page_token = 5;
 }
 
 message ListBlocksResponse {
     repeated BeaconBlock blocks = 1;
+
+    // A pagination token returned from a previous call to `ListBlocks`
+    // that indicates from where listing should continue.
+    // This field is optional.
+    string next_page_token = 2;
+
+    // Total count of Blocks matching the request filter.
+    int32 total_size = 3;
 }
 
 // Information about the head of the beacon chain.
diff --git a/shared/pagination/pagination.go b/shared/pagination/pagination.go
index ddff00471b..1f94e58bf7 100644
--- a/shared/pagination/pagination.go
+++ b/shared/pagination/pagination.go
@@ -25,7 +25,7 @@ func StartAndEndPage(pageToken string, pageSize int, totalSize int) (int, int, s
 	// Start page can not be greater than validator size.
 	start := token * pageSize
 	if start >= totalSize {
-		return 0, 0, "", fmt.Errorf("page start %d >= validator list %d", start, totalSize)
+		return 0, 0, "", fmt.Errorf("page start %d >= list %d", start, totalSize)
 	}
 
 	// End page can not go out of bound.
diff --git a/shared/pagination/pagination_test.go b/shared/pagination/pagination_test.go
index 1b763da18e..4d482038b6 100644
--- a/shared/pagination/pagination_test.go
+++ b/shared/pagination/pagination_test.go
@@ -73,7 +73,7 @@ func TestStartAndEndPage_CannotConvertPage(t *testing.T) {
 }
 
 func TestStartAndEndPage_ExceedsMaxPage(t *testing.T) {
-	wanted := "page start 0 >= validator list 0"
+	wanted := "page start 0 >= list 0"
 	if _, _, _, err := StartAndEndPage("", 0, 0); !strings.Contains(err.Error(), wanted) {
 		t.Fatalf("wanted error: %v, got error: %v", wanted, err.Error())
 	}