diff --git a/beacon_chain/rpc/rest_debug_api.nim b/beacon_chain/rpc/rest_debug_api.nim
index cb4a305529..1013c09e75 100644
--- a/beacon_chain/rpc/rest_debug_api.nim
+++ b/beacon_chain/rpc/rest_debug_api.nim
@@ -138,52 +138,3 @@ proc installDebugApiHandlers*(router: var RestRouter, node: BeaconNode) =
           bestDescendant: item.bestDescendant))
 
     RestApiResponse.jsonResponsePlain(response)
-
-  router.metricsApi2(
-    MethodGet,
-    "/eth/v1/debug/beacon/states/{state_id}/historical_summaries",
-    {RestServerMetricsType.Status, Response},
-  ) do(state_id: StateIdent) -> RestApiResponse:
-    let
-      sid = state_id.valueOr:
-        return RestApiResponse.jsonError(Http400, InvalidStateIdValueError, $error)
-      bslot = node.getBlockSlotId(sid).valueOr:
-        return RestApiResponse.jsonError(Http404, StateNotFoundError, $error)
-      contentType = preferredContentType(jsonMediaType, sszMediaType).valueOr:
-        return RestApiResponse.jsonError(Http406, ContentNotAcceptableError)
-
-    node.withStateForBlockSlotId(bslot):
-      return withState(state):
-        when consensusFork >= ConsensusFork.Capella:
-          # Build the proof for historical_summaries field (28th field in BeaconState)
-          let gIndex = GeneralizedIndex(59) # 31 + 28 = 59
-          var proof: array[5, Digest]
-          if forkyState.data.build_proof(gIndex, proof).isErr:
-            return RestApiResponse.jsonError(Http500, InvalidMerkleProofIndexError)
-
-          if contentType == jsonMediaType:
-            let response = RestHistoricalSummaries(
-              historical_summaries: forkyState.data.historical_summaries.asSeq(),
-              proof: proof,
-              slot: bslot.slot,
-            )
-
-            RestApiResponse.jsonResponseFinalized(
-              response, node.getStateOptimistic(state), node.dag.isFinalized(bslot.bid)
-            )
-          elif contentType == sszMediaType:
-            let
-              headers = [("eth-consensus-version", consensusFork.toString())]
-              response = GetHistoricalSummariesV1Response(
-                historical_summaries: forkyState.data.historical_summaries,
-                proof: proof,
-                slot: bslot.slot,
-              )
-
-            RestApiResponse.sszResponse(response, headers)
-          else:
-            RestApiResponse.jsonError(Http500, InvalidAcceptError)
-        else:
-          RestApiResponse.jsonError(Http404, HistoricalSummariesUnavailable)
-
-    RestApiResponse.jsonError(Http404, StateNotFoundError)
diff --git a/beacon_chain/rpc/rest_nimbus_api.nim b/beacon_chain/rpc/rest_nimbus_api.nim
index 027ae72a62..09be4932c5 100644
--- a/beacon_chain/rpc/rest_nimbus_api.nim
+++ b/beacon_chain/rpc/rest_nimbus_api.nim
@@ -531,3 +531,52 @@ proc installNimbusApiHandlers*(router: var RestRouter, node: BeaconNode) =
         delay: uint64(delay.nanoseconds)
       )
     RestApiResponse.jsonResponsePlain(response)
+
+  router.metricsApi2(
+    MethodGet,
+    "/nimbus/v1/debug/beacon/states/{state_id}/historical_summaries",
+    {RestServerMetricsType.Status, Response},
+  ) do(state_id: StateIdent) -> RestApiResponse:
+    let
+      sid = state_id.valueOr:
+        return RestApiResponse.jsonError(Http400, InvalidStateIdValueError, $error)
+      bslot = node.getBlockSlotId(sid).valueOr:
+        return RestApiResponse.jsonError(Http404, StateNotFoundError, $error)
+      contentType = preferredContentType(jsonMediaType, sszMediaType).valueOr:
+        return RestApiResponse.jsonError(Http406, ContentNotAcceptableError)
+
+    node.withStateForBlockSlotId(bslot):
+      return withState(state):
+        when consensusFork >= ConsensusFork.Capella:
+          # Build the proof for historical_summaries field (28th field in BeaconState)
+          let gIndex = GeneralizedIndex(59) # 31 + 28 = 59
+          var proof: array[5, Digest]
+          if forkyState.data.build_proof(gIndex, proof).isErr:
+            return RestApiResponse.jsonError(Http500, InvalidMerkleProofIndexError)
+
+          if contentType == jsonMediaType:
+            let response = RestHistoricalSummaries(
+              historical_summaries: forkyState.data.historical_summaries.asSeq(),
+              proof: proof,
+              slot: bslot.slot,
+            )
+
+            RestApiResponse.jsonResponseFinalized(
+              response, node.getStateOptimistic(state), node.dag.isFinalized(bslot.bid)
+            )
+          elif contentType == sszMediaType:
+            let
+              headers = [("eth-consensus-version", consensusFork.toString())]
+              response = GetHistoricalSummariesV1Response(
+                historical_summaries: forkyState.data.historical_summaries,
+                proof: proof,
+                slot: bslot.slot,
+              )
+
+            RestApiResponse.sszResponse(response, headers)
+          else:
+            RestApiResponse.jsonError(Http500, InvalidAcceptError)
+        else:
+          RestApiResponse.jsonError(Http404, HistoricalSummariesUnavailable)
+
+    RestApiResponse.jsonError(Http404, StateNotFoundError)
diff --git a/beacon_chain/spec/eth2_apis/rest_debug_calls.nim b/beacon_chain/spec/eth2_apis/rest_debug_calls.nim
index 8592b3eaf3..c5c517d623 100644
--- a/beacon_chain/spec/eth2_apis/rest_debug_calls.nim
+++ b/beacon_chain/spec/eth2_apis/rest_debug_calls.nim
@@ -73,63 +73,3 @@ proc getStateV2*(client: RestClientRef, state_id: StateIdent,
         msg: msg, status: error.code, message: error.message)
     else:
       raiseRestResponseError(resp)
-
-proc getHistoricalSummariesV1Plain*(
-  state_id: StateIdent
-): RestPlainResponse {.
-  rest,
-  endpoint: "/eth/v1/debug/beacon/states/{state_id}/historical_summaries",
-  accept: preferSSZ,
-  meth: MethodGet
-.}
-
-proc getHistoricalSummariesV1*(
-    client: RestClientRef, state_id: StateIdent, cfg: RuntimeConfig, restAccept = ""
-): Future[Option[GetHistoricalSummariesV1Response]] {.
-    async: (
-      raises: [
-        CancelledError, RestEncodingError, RestDnsResolveError, RestCommunicationError,
-        RestDecodingError, RestResponseError,
-      ]
-    )
-.} =
-  let resp =
-    if len(restAccept) > 0:
-      await client.getHistoricalSummariesV1Plain(state_id, restAcceptType = restAccept)
-    else:
-      await client.getHistoricalSummariesV1Plain(state_id)
-
-  return
-    case resp.status
-    of 200:
-      if resp.contentType.isNone() or isWildCard(resp.contentType.get().mediaType):
-        raise newException(RestDecodingError, "Missing or incorrect Content-Type")
-      else:
-        let mediaType = resp.contentType.get().mediaType
-        if mediaType == ApplicationJsonMediaType:
-          let summaries = decodeBytes(
-            GetHistoricalSummariesV1Response, resp.data, resp.contentType
-          ).valueOr:
-            raise newException(RestDecodingError, $error)
-          some(summaries)
-        elif mediaType == OctetStreamMediaType:
-          let summaries =
-            try:
-              SSZ.decode(resp.data, GetHistoricalSummariesV1Response)
-            except SerializationError as exc:
-              raise newException(RestDecodingError, exc.msg)
-          some(summaries)
-        else:
-          raise newException(RestDecodingError, "Unsupported Content-Type")
-    of 404:
-      none(GetHistoricalSummariesV1Response)
-    of 400, 500:
-      let error = decodeBytes(RestErrorMessage, resp.data, resp.contentType).valueOr:
-        let msg =
-          "Incorrect response error format (" & $resp.status & ") [" & $error & "]"
-        raise (ref RestResponseError)(msg: msg, status: resp.status)
-      let msg = "Error response (" & $resp.status & ") [" & error.message & "]"
-      raise
-        (ref RestResponseError)(msg: msg, status: error.code, message: error.message)
-    else:
-      raiseRestResponseError(resp)
diff --git a/beacon_chain/spec/eth2_apis/rest_nimbus_calls.nim b/beacon_chain/spec/eth2_apis/rest_nimbus_calls.nim
index 3de4ceded1..3c488d475d 100644
--- a/beacon_chain/spec/eth2_apis/rest_nimbus_calls.nim
+++ b/beacon_chain/spec/eth2_apis/rest_nimbus_calls.nim
@@ -76,3 +76,63 @@ proc getTimeOffset*(client: RestClientRef,
     let msg = "Error response (" & $resp.status & ") [" & error.message & "]"
     raise (ref RestResponseError)(
       msg: msg, status: error.code, message: error.message)
+
+proc getHistoricalSummariesV1Plain*(
+  state_id: StateIdent
+): RestPlainResponse {.
+  rest,
+  endpoint: "/nimbus/v1/debug/beacon/states/{state_id}/historical_summaries",
+  accept: preferSSZ,
+  meth: MethodGet
+.}
+
+proc getHistoricalSummariesV1*(
+    client: RestClientRef, state_id: StateIdent, cfg: RuntimeConfig, restAccept = ""
+): Future[Option[GetHistoricalSummariesV1Response]] {.
+    async: (
+      raises: [
+        CancelledError, RestEncodingError, RestDnsResolveError, RestCommunicationError,
+        RestDecodingError, RestResponseError,
+      ]
+    )
+.} =
+  let resp =
+    if len(restAccept) > 0:
+      await client.getHistoricalSummariesV1Plain(state_id, restAcceptType = restAccept)
+    else:
+      await client.getHistoricalSummariesV1Plain(state_id)
+
+  return
+    case resp.status
+    of 200:
+      if resp.contentType.isNone() or isWildCard(resp.contentType.get().mediaType):
+        raise newException(RestDecodingError, "Missing or incorrect Content-Type")
+      else:
+        let mediaType = resp.contentType.get().mediaType
+        if mediaType == ApplicationJsonMediaType:
+          let summaries = decodeBytes(
+            GetHistoricalSummariesV1Response, resp.data, resp.contentType
+          ).valueOr:
+            raise newException(RestDecodingError, $error)
+          some(summaries)
+        elif mediaType == OctetStreamMediaType:
+          let summaries =
+            try:
+              SSZ.decode(resp.data, GetHistoricalSummariesV1Response)
+            except SerializationError as exc:
+              raise newException(RestDecodingError, exc.msg)
+          some(summaries)
+        else:
+          raise newException(RestDecodingError, "Unsupported Content-Type")
+    of 404:
+      none(GetHistoricalSummariesV1Response)
+    of 400, 500:
+      let error = decodeBytes(RestErrorMessage, resp.data, resp.contentType).valueOr:
+        let msg =
+          "Incorrect response error format (" & $resp.status & ") [" & $error & "]"
+        raise (ref RestResponseError)(msg: msg, status: resp.status)
+      let msg = "Error response (" & $resp.status & ") [" & error.message & "]"
+      raise
+        (ref RestResponseError)(msg: msg, status: error.code, message: error.message)
+    else:
+      raiseRestResponseError(resp)