diff --git a/data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/BeaconRestApiTypes.java b/data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/BeaconRestApiTypes.java
index 8fc454f72ec..2e776b3d5f2 100644
--- a/data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/BeaconRestApiTypes.java
+++ b/data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/BeaconRestApiTypes.java
@@ -76,7 +76,9 @@
 import tech.pegasys.teku.spec.SpecMilestone;
 import tech.pegasys.teku.spec.datastructures.blocks.SignedBeaconBlockHeader;
 import tech.pegasys.teku.spec.datastructures.metadata.BlockAndMetaData;
+import tech.pegasys.teku.spec.datastructures.operations.Attestation;
 import tech.pegasys.teku.spec.datastructures.validator.BroadcastValidationLevel;
+import tech.pegasys.teku.spec.schemas.SchemaDefinitionCache;
 
 public class BeaconRestApiTypes {
   private static final StringValueTypeDefinition<StatusParameter> STATUS_VALUE =
@@ -247,6 +249,26 @@ public class BeaconRestApiTypes {
   public static final ParameterMetadata<SpecMilestone> ETH_CONSENSUS_VERSION_TYPE =
       new ParameterMetadata<>(HEADER_CONSENSUS_VERSION, MILESTONE_TYPE);
 
+  @SuppressWarnings("unchecked")
+  public static DeserializableTypeDefinition<Attestation> electraAttestationTypeDef(
+      final SchemaDefinitionCache schemaDefinitionCache) {
+    return (DeserializableTypeDefinition<Attestation>)
+        schemaDefinitionCache
+            .getSchemaDefinition(SpecMilestone.ELECTRA)
+            .getAttestationSchema()
+            .getJsonTypeDefinition();
+  }
+
+  @SuppressWarnings("unchecked")
+  public static DeserializableTypeDefinition<Attestation> phase0AttestationTypeDef(
+      final SchemaDefinitionCache schemaDefinitionCache) {
+    return (DeserializableTypeDefinition<Attestation>)
+        schemaDefinitionCache
+            .getSchemaDefinition(SpecMilestone.PHASE0)
+            .getAttestationSchema()
+            .getJsonTypeDefinition();
+  }
+
   @SuppressWarnings("JavaCase")
   public enum BroadcastValidationParameter {
     gossip,
diff --git a/data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/handlers/v2/beacon/GetBlockAttestationsV2.java b/data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/handlers/v2/beacon/GetBlockAttestationsV2.java
index d309cfef9b0..81b15809640 100644
--- a/data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/handlers/v2/beacon/GetBlockAttestationsV2.java
+++ b/data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/handlers/v2/beacon/GetBlockAttestationsV2.java
@@ -30,8 +30,8 @@
 import tech.pegasys.teku.api.ChainDataProvider;
 import tech.pegasys.teku.api.DataProvider;
 import tech.pegasys.teku.api.schema.Version;
+import tech.pegasys.teku.beaconrestapi.BeaconRestApiTypes;
 import tech.pegasys.teku.infrastructure.async.SafeFuture;
-import tech.pegasys.teku.infrastructure.json.types.DeserializableTypeDefinition;
 import tech.pegasys.teku.infrastructure.json.types.SerializableOneOfTypeDefinition;
 import tech.pegasys.teku.infrastructure.json.types.SerializableOneOfTypeDefinitionBuilder;
 import tech.pegasys.teku.infrastructure.json.types.SerializableTypeDefinition;
@@ -39,7 +39,6 @@
 import tech.pegasys.teku.infrastructure.restapi.endpoints.EndpointMetadata;
 import tech.pegasys.teku.infrastructure.restapi.endpoints.RestApiEndpoint;
 import tech.pegasys.teku.infrastructure.restapi.endpoints.RestApiRequest;
-import tech.pegasys.teku.spec.SpecMilestone;
 import tech.pegasys.teku.spec.datastructures.metadata.ObjectAndMetaData;
 import tech.pegasys.teku.spec.datastructures.operations.Attestation;
 import tech.pegasys.teku.spec.schemas.SchemaDefinitionCache;
@@ -92,24 +91,15 @@ public void handleRequest(final RestApiRequest request) throws JsonProcessingExc
   @SuppressWarnings("unchecked")
   private static SerializableTypeDefinition<ObjectAndMetaData<List<Attestation>>> getResponseType(
       final SchemaDefinitionCache schemaDefinitionCache) {
-    final DeserializableTypeDefinition<Attestation> electraAttestationTypeDef =
-        (DeserializableTypeDefinition<Attestation>)
-            schemaDefinitionCache
-                .getSchemaDefinition(SpecMilestone.ELECTRA)
-                .getAttestationSchema()
-                .getJsonTypeDefinition();
-
-    final DeserializableTypeDefinition<Attestation> phase0AttestationTypeDef =
-        (DeserializableTypeDefinition<Attestation>)
-            schemaDefinitionCache
-                .getSchemaDefinition(SpecMilestone.PHASE0)
-                .getAttestationSchema()
-                .getJsonTypeDefinition();
 
     final SerializableOneOfTypeDefinition<List<Attestation>> oneOfTypeDefinition =
         new SerializableOneOfTypeDefinitionBuilder<List<Attestation>>()
-            .withType(electraAttestationsPredicate(), listOf(electraAttestationTypeDef))
-            .withType(phase0AttestationsPredicate(), listOf(phase0AttestationTypeDef))
+            .withType(
+                electraAttestationsPredicate(),
+                listOf(BeaconRestApiTypes.electraAttestationTypeDef(schemaDefinitionCache)))
+            .withType(
+                phase0AttestationsPredicate(),
+                listOf(BeaconRestApiTypes.phase0AttestationTypeDef(schemaDefinitionCache)))
             .build();
 
     return SerializableTypeDefinition.<ObjectAndMetaData<List<Attestation>>>object()
diff --git a/data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/handlers/v2/validator/GetAggregateAttestationV2.java b/data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/handlers/v2/validator/GetAggregateAttestationV2.java
index 1230ef18b8e..8f9e9e3b064 100644
--- a/data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/handlers/v2/validator/GetAggregateAttestationV2.java
+++ b/data/beaconrestapi/src/main/java/tech/pegasys/teku/beaconrestapi/handlers/v2/validator/GetAggregateAttestationV2.java
@@ -28,9 +28,9 @@
 import tech.pegasys.teku.api.DataProvider;
 import tech.pegasys.teku.api.ValidatorDataProvider;
 import tech.pegasys.teku.api.schema.Version;
+import tech.pegasys.teku.beaconrestapi.BeaconRestApiTypes;
 import tech.pegasys.teku.infrastructure.async.SafeFuture;
 import tech.pegasys.teku.infrastructure.http.HttpStatusCodes;
-import tech.pegasys.teku.infrastructure.json.types.DeserializableTypeDefinition;
 import tech.pegasys.teku.infrastructure.json.types.SerializableOneOfTypeDefinition;
 import tech.pegasys.teku.infrastructure.json.types.SerializableOneOfTypeDefinitionBuilder;
 import tech.pegasys.teku.infrastructure.json.types.SerializableTypeDefinition;
@@ -39,7 +39,6 @@
 import tech.pegasys.teku.infrastructure.restapi.endpoints.RestApiEndpoint;
 import tech.pegasys.teku.infrastructure.restapi.endpoints.RestApiRequest;
 import tech.pegasys.teku.infrastructure.unsigned.UInt64;
-import tech.pegasys.teku.spec.SpecMilestone;
 import tech.pegasys.teku.spec.datastructures.metadata.ObjectAndMetaData;
 import tech.pegasys.teku.spec.datastructures.operations.Attestation;
 import tech.pegasys.teku.spec.schemas.SchemaDefinitionCache;
@@ -105,24 +104,14 @@ public void handleRequest(final RestApiRequest request) throws JsonProcessingExc
   private static SerializableTypeDefinition<ObjectAndMetaData<Attestation>> getResponseType(
       final SchemaDefinitionCache schemaDefinitionCache) {
 
-    final DeserializableTypeDefinition<Attestation> electraAttestationTypeDef =
-        (DeserializableTypeDefinition<Attestation>)
-            schemaDefinitionCache
-                .getSchemaDefinition(SpecMilestone.ELECTRA)
-                .getAttestationSchema()
-                .getJsonTypeDefinition();
-
-    final DeserializableTypeDefinition<Attestation> phase0AttestationTypeDef =
-        (DeserializableTypeDefinition<Attestation>)
-            schemaDefinitionCache
-                .getSchemaDefinition(SpecMilestone.PHASE0)
-                .getAttestationSchema()
-                .getJsonTypeDefinition();
-
     final SerializableOneOfTypeDefinition<Attestation> oneOfTypeDefinition =
         new SerializableOneOfTypeDefinitionBuilder<Attestation>()
-            .withType(electraAttestationPredicate(), electraAttestationTypeDef)
-            .withType(phase0AttestationPredicate(), phase0AttestationTypeDef)
+            .withType(
+                electraAttestationPredicate(),
+                BeaconRestApiTypes.electraAttestationTypeDef(schemaDefinitionCache))
+            .withType(
+                phase0AttestationPredicate(),
+                BeaconRestApiTypes.phase0AttestationTypeDef(schemaDefinitionCache))
             .build();
 
     return SerializableTypeDefinition.<ObjectAndMetaData<Attestation>>object()
@@ -139,6 +128,6 @@ private static Predicate<Attestation> phase0AttestationPredicate() {
 
   private static Predicate<Attestation> electraAttestationPredicate() {
     // Only once we are in Electra attestations will have committee bits
-    return attestation -> attestation.requiresCommitteeBits();
+    return Attestation::requiresCommitteeBits;
   }
 }