diff --git a/src/lib/constants.ts b/src/lib/constants.ts
index ed3a846f..f3d29335 100644
--- a/src/lib/constants.ts
+++ b/src/lib/constants.ts
@@ -1,4 +1,5 @@
 import { isBrowser } from "./helpers";
+import { DeepgramClientOptions } from "./types/DeepgramClientOptions";
 import { FetchOptions } from "./types/Fetch";
 import { version } from "./version";
 
@@ -18,7 +19,7 @@ export const DEFAULT_FETCH_OPTIONS: FetchOptions = {
   headers: DEFAULT_HEADERS,
 };
 
-export const DEFAULT_OPTIONS = {
+export const DEFAULT_OPTIONS: DeepgramClientOptions = {
   global: DEFAULT_GLOBAL_OPTIONS,
   fetch: DEFAULT_FETCH_OPTIONS,
 };
diff --git a/src/lib/fetch.ts b/src/lib/fetch.ts
index 0d65b632..37f7e594 100644
--- a/src/lib/fetch.ts
+++ b/src/lib/fetch.ts
@@ -2,9 +2,11 @@ import crossFetch from "cross-fetch";
 import { resolveHeadersConstructor } from "./helpers";
 import type { Fetch } from "./types/Fetch";
 
-export const resolveFetch = (): Fetch => {
+export const resolveFetch = (customFetch?: Fetch): Fetch => {
   let _fetch: Fetch;
-  if (typeof fetch === "undefined") {
+  if (customFetch) {
+    _fetch = customFetch;
+  } else if (typeof fetch === "undefined") {
     _fetch = crossFetch as unknown as Fetch;
   } else {
     _fetch = fetch;
@@ -12,8 +14,8 @@ export const resolveFetch = (): Fetch => {
   return (...args) => _fetch(...args);
 };
 
-export const fetchWithAuth = (apiKey: string): Fetch => {
-  const fetch = resolveFetch();
+export const fetchWithAuth = (apiKey: string, customFetch?: Fetch): Fetch => {
+  const fetch = resolveFetch(customFetch);
   const HeadersConstructor = resolveHeadersConstructor();
 
   return async (input, init) => {
diff --git a/src/lib/types/DeepgramClientOptions.ts b/src/lib/types/DeepgramClientOptions.ts
index 8ba12c5a..4b4d40ce 100644
--- a/src/lib/types/DeepgramClientOptions.ts
+++ b/src/lib/types/DeepgramClientOptions.ts
@@ -1,4 +1,4 @@
-import { FetchOptions } from "./Fetch";
+import { Fetch, FetchOptions } from "./Fetch";
 
 export interface DeepgramClientOptions {
   global?: {
@@ -13,6 +13,7 @@ export interface DeepgramClientOptions {
     url?: string;
   };
   fetch?: FetchOptions;
+  _experimentalCustomFetch?: Fetch;
   restProxy?: {
     url: null | string;
   };
diff --git a/src/packages/AbstractRestfulClient.ts b/src/packages/AbstractRestfulClient.ts
index 6ac59984..48fa65ae 100644
--- a/src/packages/AbstractRestfulClient.ts
+++ b/src/packages/AbstractRestfulClient.ts
@@ -18,7 +18,7 @@ export abstract class AbstractRestfulClient extends AbstractClient {
       );
     }
 
-    this.fetch = fetchWithAuth(this.key);
+    this.fetch = fetchWithAuth(this.key, options._experimentalCustomFetch);
   }
 
   protected _getErrorMessage(err: any): string {
diff --git a/test/client.test.ts b/test/client.test.ts
index 04c9b300..426edf8c 100644
--- a/test/client.test.ts
+++ b/test/client.test.ts
@@ -1,6 +1,6 @@
 import { createClient } from "../src";
 import { DEFAULT_URL } from "../src/lib/constants";
-import { expect } from "chai";
+import { expect, assert } from "chai";
 import { faker } from "@faker-js/faker";
 import { stripTrailingSlash } from "../src/lib/helpers";
 import DeepgramClient from "../src/DeepgramClient";
@@ -82,4 +82,21 @@ describe("testing creation of a deepgram client object", () => {
 
     expect(client).is.instanceOf(DeepgramClient);
   });
+
+  it("should use custom fetch when provided", async () => {
+    const fetch = async () => {
+      return new Response(JSON.stringify({ customFetch: true }));
+    };
+
+    const client = createClient(faker.string.alphanumeric(40), {
+      global: { url: "https://api.mock.deepgram.com" },
+      _experimentalCustomFetch: fetch,
+    });
+
+    const { result, error } = await client.manage.getProjectBalances(faker.string.uuid());
+
+    assert.isNull(error);
+    assert.isNotNull(result);
+    assert.containsAllDeepKeys(result, ["customFetch"]);
+  });
 });