diff --git a/crates/rpc/rpc-builder/tests/it/http.rs b/crates/rpc/rpc-builder/tests/it/http.rs
index 221b2913dd..997bf0ef9e 100644
--- a/crates/rpc/rpc-builder/tests/it/http.rs
+++ b/crates/rpc/rpc-builder/tests/it/http.rs
@@ -14,7 +14,7 @@ use reth_primitives::{
 };
 use reth_rpc_api::{
     clients::{AdminApiClient, EthApiClient},
-    DebugApiClient, NetApiClient, TraceApiClient, Web3ApiClient,
+    DebugApiClient, NetApiClient, OtterscanClient, TraceApiClient, Web3ApiClient,
 };
 use reth_rpc_builder::RethRpcModule;
 use reth_rpc_types::{trace::filter::TraceFilter, CallRequest, Index, TransactionRequest};
@@ -180,6 +180,69 @@ where
     Web3ApiClient::sha3(client, Bytes::default()).await.unwrap();
 }
 
+async fn test_basic_otterscan_calls<C>(client: &C)
+where
+    C: ClientT + SubscriptionClientT + Sync,
+{
+    let address = Address::default();
+    let sender = Address::default();
+    let tx_hash = TxHash::default();
+    let block_number = BlockNumberOrTag::default();
+    let page_number = 1;
+    let page_size = 10;
+    let nonce = 1;
+    let block_hash = H256::default();
+
+    assert!(is_unimplemented(
+        OtterscanClient::has_code(client, address, None).await.err().unwrap()
+    ));
+
+    OtterscanClient::get_api_level(client).await.unwrap();
+
+    assert!(is_unimplemented(
+        OtterscanClient::get_internal_operations(client, tx_hash).await.err().unwrap()
+    ));
+    assert!(is_unimplemented(
+        OtterscanClient::get_transaction_error(client, tx_hash).await.err().unwrap()
+    ));
+    assert!(is_unimplemented(
+        OtterscanClient::trace_transaction(client, tx_hash).await.err().unwrap()
+    ));
+    assert!(is_unimplemented(
+        OtterscanClient::get_block_details(client, block_number,).await.err().unwrap()
+    ));
+    assert!(is_unimplemented(
+        OtterscanClient::get_block_details_by_hash(client, block_hash).await.err().unwrap()
+    ));
+    assert!(is_unimplemented(
+        OtterscanClient::get_block_transactions(client, block_number, page_number, page_size,)
+            .await
+            .err()
+            .unwrap()
+    ));
+    assert!(is_unimplemented(
+        OtterscanClient::search_transactions_before(client, address, block_number, page_size,)
+            .await
+            .err()
+            .unwrap()
+    ));
+    assert!(is_unimplemented(
+        OtterscanClient::search_transactions_after(client, address, block_number, page_size,)
+            .await
+            .err()
+            .unwrap()
+    ));
+    assert!(is_unimplemented(
+        OtterscanClient::get_transaction_by_sender_and_nonce(client, sender, nonce,)
+            .await
+            .err()
+            .unwrap()
+    ));
+    assert!(is_unimplemented(
+        OtterscanClient::get_contract_creator(client, address).await.err().unwrap()
+    ));
+}
+
 #[tokio::test(flavor = "multi_thread")]
 async fn test_call_admin_functions_http() {
     reth_tracing::init_test_tracing();
@@ -341,3 +404,30 @@ async fn test_call_web3_functions_http_and_ws() {
     let client = handle.http_client().unwrap();
     test_basic_web3_calls(&client).await;
 }
+
+#[tokio::test(flavor = "multi_thread")]
+async fn test_call_otterscan_functions_http() {
+    reth_tracing::init_test_tracing();
+
+    let handle = launch_http(vec![RethRpcModule::Ots]).await;
+    let client = handle.http_client().unwrap();
+    test_basic_otterscan_calls(&client).await;
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn test_call_otterscan_functions_ws() {
+    reth_tracing::init_test_tracing();
+
+    let handle = launch_ws(vec![RethRpcModule::Ots]).await;
+    let client = handle.ws_client().await.unwrap();
+    test_basic_otterscan_calls(&client).await;
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn test_call_otterscan_functions_http_and_ws() {
+    reth_tracing::init_test_tracing();
+
+    let handle = launch_http_ws(vec![RethRpcModule::Ots]).await;
+    let client = handle.http_client().unwrap();
+    test_basic_otterscan_calls(&client).await;
+}
diff --git a/crates/rpc/rpc/src/otterscan.rs b/crates/rpc/rpc/src/otterscan.rs
index 93d0ba167e..da895c6936 100644
--- a/crates/rpc/rpc/src/otterscan.rs
+++ b/crates/rpc/rpc/src/otterscan.rs
@@ -9,6 +9,8 @@ use reth_rpc_types::{
     Transaction, TransactionsWithReceipts,
 };
 
+const API_LEVEL: u64 = 8;
+
 /// Otterscan Api
 #[derive(Debug)]
 pub struct OtterscanApi<Eth> {
@@ -34,7 +36,7 @@ where
 
     /// Handler for `ots_getApiLevel`
     async fn get_api_level(&self) -> RpcResult<u64> {
-        Err(internal_rpc_err("unimplemented"))
+        Ok(API_LEVEL)
     }
 
     /// Handler for `ots_getInternalOperations`