diff --git a/packages/api-rest/src/apis/common/handler.ts b/packages/api-rest/src/apis/common/handler.ts
index 9ae021e4e4e..4980269ed1c 100644
--- a/packages/api-rest/src/apis/common/handler.ts
+++ b/packages/api-rest/src/apis/common/handler.ts
@@ -21,6 +21,7 @@ import {
 } from '../../utils';
 import { resolveHeaders } from '../../utils/resolveHeaders';
 import { RestApiResponse } from '../../types';
+import { iamAuthApplicableGQL } from '../../utils/iamAuthApplicable';
 
 type HandlerOptions = Omit<HttpRequest, 'body' | 'headers'> & {
 	body?: DocumentType | FormData;
@@ -47,6 +48,10 @@ export const transferHandler = async (
 	amplify: AmplifyClassV6,
 	options: HandlerOptions & { abortSignal: AbortSignal },
 	signingServiceInfo?: SigningServiceInfo,
+	iamAuthApplicable: (
+		{ headers }: HttpRequest,
+		signingServiceInfo?: SigningServiceInfo,
+	) => boolean = iamAuthApplicableGQL,
 ): Promise<RestApiResponse> => {
 	const { url, method, headers, body, withCredentials, abortSignal } = options;
 	const resolvedBody = body
@@ -97,11 +102,6 @@ export const transferHandler = async (
 	};
 };
 
-const iamAuthApplicable = (
-	{ headers }: HttpRequest,
-	signingServiceInfo?: SigningServiceInfo,
-) => !headers.authorization && !headers['x-api-key'] && !!signingServiceInfo;
-
 const resolveCredentials = async (
 	amplify: AmplifyClassV6,
 ): Promise<AWSCredentials | null> => {
diff --git a/packages/api-rest/src/apis/common/publicApis.ts b/packages/api-rest/src/apis/common/publicApis.ts
index 6a132a6b277..0bd7f0a189e 100644
--- a/packages/api-rest/src/apis/common/publicApis.ts
+++ b/packages/api-rest/src/apis/common/publicApis.ts
@@ -25,6 +25,7 @@ import {
 	parseSigningInfo,
 	resolveApiUrl,
 } from '../../utils';
+import { iamAuthApplicablePublic } from '../../utils/iamAuthApplicable';
 
 import { transferHandler } from './handler';
 
@@ -72,6 +73,7 @@ const publicHandler = (
 				abortSignal,
 			},
 			signingServiceInfo,
+			iamAuthApplicablePublic,
 		);
 	});
 
diff --git a/packages/api-rest/src/utils/iamAuthApplicable.ts b/packages/api-rest/src/utils/iamAuthApplicable.ts
new file mode 100644
index 00000000000..18c5f9ce8aa
--- /dev/null
+++ b/packages/api-rest/src/utils/iamAuthApplicable.ts
@@ -0,0 +1,19 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+import { HttpRequest } from '@aws-amplify/core/internals/aws-client-utils';
+
+interface SigningServiceInfo {
+	service?: string;
+	region?: string;
+}
+
+export const iamAuthApplicableGQL = (
+	{ headers }: HttpRequest,
+	signingServiceInfo?: SigningServiceInfo,
+) => !headers.authorization && !headers['x-api-key'] && !!signingServiceInfo;
+
+export const iamAuthApplicablePublic = (
+	{ headers }: HttpRequest,
+	signingServiceInfo?: SigningServiceInfo,
+) => !headers.authorization && !!signingServiceInfo;