diff --git a/data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/handlers/v1/beacon/PostBlsToExecutionChanges.java b/data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/handlers/v1/beacon/PostBlsToExecutionChanges.java
index 06f0057fa15..12c17034911 100644
--- a/data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/handlers/v1/beacon/PostBlsToExecutionChanges.java
+++ b/data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/handlers/v1/beacon/PostBlsToExecutionChanges.java
@@ -36,6 +36,7 @@
 
 public class PostBlsToExecutionChanges extends RestApiEndpoint {
   public static final String ROUTE = "/eth/v1/beacon/pool/bls_to_execution_changes";
+  private static final int MAX_BLS_MESSAGES_PER_REQUEST = 5000;
   private final NodeDataProvider nodeDataProvider;
 
   public PostBlsToExecutionChanges(
@@ -76,6 +77,15 @@ private static EndpointMetadata createEndpointMetadata(final SchemaDefinitionCac
   @Override
   public void handleRequest(RestApiRequest request) throws JsonProcessingException {
     final List<SignedBlsToExecutionChange> blsToExecutionChanges = request.getRequestBody();
+    if (blsToExecutionChanges.size() > MAX_BLS_MESSAGES_PER_REQUEST) {
+      final String errorMessage =
+          String.format(
+              "A maximum of %s SignedBLSToExecutionChange objects can be submitted to the node's pool at one time",
+              MAX_BLS_MESSAGES_PER_REQUEST);
+      request.respondError(SC_BAD_REQUEST, errorMessage);
+      return;
+    }
+
     final SafeFuture<List<SubmitDataError>> future =
         nodeDataProvider.postBlsToExecutionChanges(blsToExecutionChanges);
 
diff --git a/data/beaconrestapi/src/test/java/tech/pegasys/teku/beaconrestapi/handlers/v1/beacon/PostBlsToExecutionChangesTest.java b/data/beaconrestapi/src/test/java/tech/pegasys/teku/beaconrestapi/handlers/v1/beacon/PostBlsToExecutionChangesTest.java
index 8c7d0c5a2ce..8ec03f0a819 100644
--- a/data/beaconrestapi/src/test/java/tech/pegasys/teku/beaconrestapi/handlers/v1/beacon/PostBlsToExecutionChangesTest.java
+++ b/data/beaconrestapi/src/test/java/tech/pegasys/teku/beaconrestapi/handlers/v1/beacon/PostBlsToExecutionChangesTest.java
@@ -29,6 +29,7 @@
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.google.common.io.Resources;
 import java.io.IOException;
+import java.util.Collections;
 import java.util.List;
 import org.assertj.core.api.AssertionsForClassTypes;
 import org.junit.jupiter.api.BeforeEach;
@@ -36,6 +37,7 @@
 import tech.pegasys.teku.beaconrestapi.AbstractMigratedBeaconHandlerTest;
 import tech.pegasys.teku.beaconrestapi.schema.ErrorListBadRequest;
 import tech.pegasys.teku.infrastructure.async.SafeFuture;
+import tech.pegasys.teku.infrastructure.http.HttpErrorResponse;
 import tech.pegasys.teku.infrastructure.unsigned.UInt64;
 import tech.pegasys.teku.spec.SpecMilestone;
 import tech.pegasys.teku.spec.TestSpecFactory;
@@ -90,6 +92,23 @@ void shouldReturnBadRequestWhenInvalidOperationIsSubmittedToThePool() throws Exc
     assertThat(request.getResponseBody()).isEqualTo(expectedBody);
   }
 
+  @Test
+  void shouldReturnBadRequestWhenInvalidNumberOfOperationsSubmitted() throws Exception {
+    final SignedBlsToExecutionChange blsToExecutionChange =
+        dataStructureUtil.randomSignedBlsToExecutionChange();
+    List<SignedBlsToExecutionChange> requestBody = Collections.nCopies(5001, blsToExecutionChange);
+
+    request.setRequestBody(requestBody);
+    handler.handleRequest(request);
+
+    assertThat(request.getResponseCode()).isEqualTo(SC_BAD_REQUEST);
+    assertThat(request.getResponseBody())
+        .isEqualTo(
+            new HttpErrorResponse(
+                SC_BAD_REQUEST,
+                "A maximum of 5000 SignedBLSToExecutionChange objects can be submitted to the node's pool at one time"));
+  }
+
   @Test
   void metadata_shouldHandle400() throws IOException {
     final List<SubmitDataError> errors =