diff --git a/packages/relay/src/lib/clients/mirrorNodeClient.ts b/packages/relay/src/lib/clients/mirrorNodeClient.ts
index 3fb2fe9fb4..b8aed727d8 100644
--- a/packages/relay/src/lib/clients/mirrorNodeClient.ts
+++ b/packages/relay/src/lib/clients/mirrorNodeClient.ts
@@ -382,7 +382,7 @@ export class MirrorNodeClient {
     pathLabel: string,
     requestIdPrefix?: string,
     retries?: number,
-  ): Promise<any> {
+  ): Promise<T | null> {
     if (!data) data = {};
     return this.request<T>(path, pathLabel, 'POST', data, requestIdPrefix, retries);
   }
diff --git a/packages/relay/src/lib/clients/models/IOpcode.ts b/packages/relay/src/lib/clients/models/IOpcode.ts
index 4653e73869..6d8627753b 100644
--- a/packages/relay/src/lib/clients/models/IOpcode.ts
+++ b/packages/relay/src/lib/clients/models/IOpcode.ts
@@ -1,3 +1,23 @@
+/* -
+ *
+ * Hedera JSON RPC Relay
+ *
+ * Copyright (C) 2024 Hedera Hashgraph, LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
 export interface IOpcode {
   pc?: number;
   op?: string;
diff --git a/packages/relay/src/lib/clients/models/IOpcodesResponse.ts b/packages/relay/src/lib/clients/models/IOpcodesResponse.ts
index 30e5589a21..b2f08582a1 100644
--- a/packages/relay/src/lib/clients/models/IOpcodesResponse.ts
+++ b/packages/relay/src/lib/clients/models/IOpcodesResponse.ts
@@ -1,3 +1,23 @@
+/* -
+ *
+ * Hedera JSON RPC Relay
+ *
+ * Copyright (C) 2024 Hedera Hashgraph, LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
 import { IOpcode } from './IOpcode';
 
 export interface IOpcodesResponse {