diff --git a/src/web3-adapter/alchemySendHttp.ts b/src/web3-adapter/alchemySendHttp.ts
index 506cfad..fdb29f9 100644
--- a/src/web3-adapter/alchemySendHttp.ts
+++ b/src/web3-adapter/alchemySendHttp.ts
@@ -11,12 +11,20 @@ const ALCHEMY_HEADERS = new Headers({
 });
 const RATE_LIMIT_STATUS = 429;
 
+// Requests without a bound can hang indefinitely when the upstream stalls
+// (TCP accepted, no response). Default to 30s so callers surface a network
+// error instead of an unresolved promise.
+const DEFAULT_REQUEST_TIMEOUT = 30_000;
+
 export function makeJsonRpcHttpSender(url: string): AlchemySendJsonRpcFunction {
   return async (request) => {
     const response = await fetch(url, {
       method: "POST",
       headers: ALCHEMY_HEADERS,
       body: JSON.stringify(request),
+      ...(typeof AbortSignal !== "undefined" && AbortSignal.timeout
+        ? { signal: AbortSignal.timeout(DEFAULT_REQUEST_TIMEOUT) }
+        : {}),
     });
     const { status } = response;
     switch (status) {
diff --git a/src/web3-adapter/sendRestPayload.ts b/src/web3-adapter/sendRestPayload.ts
index 092cb2f..312e445 100644
--- a/src/web3-adapter/sendRestPayload.ts
+++ b/src/web3-adapter/sendRestPayload.ts
@@ -3,6 +3,10 @@ import URI from "urijs";
 import { FullConfig } from "../types";
 import { delay } from "../util/promises";
 
+// Unbounded fetches hang forever when an upstream stalls (TCP accepted, no
+// response). Bound REST calls at 30s by default.
+const DEFAULT_REQUEST_TIMEOUT = 30000;
+
 export interface RestPayloadSender {
   sendRestPayload: SendRestPayloadFunction;
 }
@@ -67,7 +71,11 @@ export function makeRestPayloadSender({
         .path(isNftPath(path) ? formatNftPath(path) : apiKey + path)
         .toString();
       for (let i = 0; i < maxRetries + 1; i++) {
-        const response = await fetch(endpoint);
+        const response = await fetch(endpoint, {
+          ...(typeof AbortSignal !== "undefined" && AbortSignal.timeout
+            ? { signal: AbortSignal.timeout(DEFAULT_REQUEST_TIMEOUT) }
+            : {}),
+        });
         const { status } = response;
         switch (status) {
           case 200: