diff --git a/extensions/qa-channel/src/bus-client.test.ts b/extensions/qa-channel/src/bus-client.test.ts
index 2c7237c83cf..899cbb50e95 100644
--- a/extensions/qa-channel/src/bus-client.test.ts
+++ b/extensions/qa-channel/src/bus-client.test.ts
@@ -1,10 +1,12 @@
 import { createServer } from "node:http";
 import { afterEach, describe, expect, it } from "vitest";
-import { pollQaBus } from "./bus-client.js";
+import { getQaBusState, pollQaBus } from "./bus-client.js";
 
-async function startJsonServer(handler: () => { statusCode?: number; body: string }) {
-  const server = createServer((_req, res) => {
-    const response = handler();
+async function startJsonServer(
+  handler: (req: { url?: string | undefined }) => { statusCode?: number; body: string },
+) {
+  const server = createServer((req, res) => {
+    const response = handler({ url: req.url });
     res.writeHead(response.statusCode ?? 200, {
       "content-type": "application/json; charset=utf-8",
     });
@@ -53,4 +55,26 @@ describe("qa-bus client", () => {
       }),
     ).rejects.toThrow(SyntaxError);
   });
+
+  it("preserves baseUrl path prefixes when composing bus URLs", async () => {
+    const server = await startJsonServer((req) => ({
+      statusCode: req.url === "/qa-bus/v1/state" ? 200 : 404,
+      body:
+        req.url === "/qa-bus/v1/state"
+          ? JSON.stringify({
+              cursor: 1,
+              conversations: [],
+              threads: [],
+              messages: [],
+              events: [],
+            })
+          : JSON.stringify({ error: `unexpected path: ${req.url}` }),
+    }));
+    stops.push(server.stop);
+
+    await expect(getQaBusState(`${server.baseUrl}/qa-bus`)).resolves.toMatchObject({
+      cursor: 1,
+      events: [],
+    });
+  });
 });
diff --git a/extensions/qa-channel/src/bus-client.ts b/extensions/qa-channel/src/bus-client.ts
index 3c7c29b2126..77bd143d09a 100644
--- a/extensions/qa-channel/src/bus-client.ts
+++ b/extensions/qa-channel/src/bus-client.ts
@@ -34,13 +34,18 @@ export type {
 
 type JsonResult<T> = Promise<T>;
 
+function buildQaBusUrl(baseUrl: string, path: string): URL {
+  const normalizedBaseUrl = baseUrl.endsWith("/") ? baseUrl : `${baseUrl}/`;
+  return new URL(path.replace(/^\/+/, ""), normalizedBaseUrl);
+}
+
 async function postJson<T>(
   baseUrl: string,
   path: string,
   body: unknown,
   signal?: AbortSignal,
 ): JsonResult<T> {
-  const url = new URL(path, baseUrl);
+  const url = buildQaBusUrl(baseUrl, path);
   const payload = JSON.stringify(body);
   const client = url.protocol === "https:" ? https : http;
 
@@ -266,7 +271,7 @@ export async function injectQaBusInboundMessage(params: {
 }
 
 export async function getQaBusState(baseUrl: string): Promise<QaBusStateSnapshot> {
-  const response = await fetch(`${baseUrl}/v1/state`);
+  const response = await fetch(buildQaBusUrl(baseUrl, "/v1/state"));
   if (!response.ok) {
     throw new Error(`qa-bus request failed: ${response.status}`);
   }
diff --git a/extensions/qa-lab/src/bus-server.ts b/extensions/qa-lab/src/bus-server.ts
index f4fd7da3296..5db53d45206 100644
--- a/extensions/qa-lab/src/bus-server.ts
+++ b/extensions/qa-lab/src/bus-server.ts
@@ -1,5 +1,6 @@
 import { createServer, type IncomingMessage, type Server, type ServerResponse } from "node:http";
 import { formatErrorMessage } from "openclaw/plugin-sdk/error-runtime";
+import { normalizeAccountId } from "./bus-queries.js";
 import type { QaBusState } from "./bus-state.js";
 import type {
   QaBusCreateThreadInput,
@@ -134,6 +135,7 @@ export async function handleQaBusRequest(params: {
       case "/v1/poll": {
         const input = body as unknown as QaBusPollInput;
         const timeoutMs = Math.max(0, Math.min(input.timeoutMs ?? 0, 30_000));
+        const accountId = normalizeAccountId(input.accountId);
         const initial = params.state.poll(input);
         if (initial.events.length > 0 || timeoutMs === 0) {
           writeJson(params.res, 200, initial);
@@ -142,7 +144,7 @@ export async function handleQaBusRequest(params: {
         try {
           await params.state.waitForCursorAdvance(input.cursor ?? 0, timeoutMs, (snapshot) => {
             return snapshot.events.some(
-              (event) => event.accountId === input.accountId && event.cursor > (input.cursor ?? 0),
+              (event) => event.accountId === accountId && event.cursor > (input.cursor ?? 0),
             );
           });
         } catch {
diff --git a/extensions/qa-lab/src/bus-state.test.ts b/extensions/qa-lab/src/bus-state.test.ts
index e0c4a065a8b..9eb7d9549bb 100644
--- a/extensions/qa-lab/src/bus-state.test.ts
+++ b/extensions/qa-lab/src/bus-state.test.ts
@@ -121,6 +121,21 @@ describe("qa-bus state", () => {
     await expect(pending).resolves.toBeUndefined();
   });
 
+  it("wakes default-account cursor waits when accountId is omitted", async () => {
+    const state = createQaBusState();
+    const pending = state.waitForCursorAdvance(0, 500, (snapshot) => {
+      return snapshot.events.some((event) => event.accountId === "default" && event.cursor > 0);
+    });
+
+    state.addInboundMessage({
+      conversation: { id: "target", kind: "direct" },
+      senderId: "default-user",
+      text: "matched",
+    });
+
+    await expect(pending).resolves.toBeUndefined();
+  });
+
   it("preserves inline attachments and lets search match attachment metadata", () => {
     const state = createQaBusState();