diff --git a/e2e/fixtures/api-mocks.ts b/e2e/fixtures/api-mocks.ts
index 149e2c91..3ef0f862 100644
--- a/e2e/fixtures/api-mocks.ts
+++ b/e2e/fixtures/api-mocks.ts
@@ -11,8 +11,10 @@ import {
   emptyChatHistoryResponse,
   emailLoginResponse,
   guestLoginResponse,
+  insufficientCreditsUnlockVoiceResponse,
   paidImageChatSendResponse,
   paidImageUnlockHistoryResponse,
+  paidVoiceHistoryResponse,
   paidPaymentOrderStatusResponse,
   paymentPlansResponse,
   userEntitlementsResponse,
@@ -22,13 +24,18 @@ import {
 interface MockCoreApisOptions {
   chatLimitTriggerAt?: number;
   paidImageFlow?: boolean;
+  paidVoiceInsufficientCreditsFlow?: boolean;
 }
 
 export async function mockCoreApis(
   page: Page,
   options: MockCoreApisOptions = {},
 ): Promise<void> {
-  const { chatLimitTriggerAt, paidImageFlow = false } = options;
+  const {
+    chatLimitTriggerAt,
+    paidImageFlow = false,
+    paidVoiceInsufficientCreditsFlow = false,
+  } = options;
   let sendCount = 0;
   let paidImageRequested = false;
   let paidImageUnlocked = false;
@@ -59,7 +66,9 @@ export async function mockCoreApis(
 
   await page.route("**/api/chat/history**", async (route) => {
     const response =
-      paidImageFlow && paidImageRequested
+      paidVoiceInsufficientCreditsFlow
+        ? paidVoiceHistoryResponse
+        : paidImageFlow && paidImageRequested
         ? createPaidImageHistoryResponse(paidImageUnlocked)
         : emptyChatHistoryResponse;
 
@@ -118,6 +127,30 @@ export async function mockCoreApis(
     await route.fulfill({ json: apiEnvelope(response) });
   });
 
+  await page.route("**/api/chat/unlock-private", async (route) => {
+    const response = paidVoiceInsufficientCreditsFlow
+      ? insufficientCreditsUnlockVoiceResponse
+      : {
+          unlocked: true,
+          content: "Unlocked message",
+          reason: "ok",
+          creditBalance: 100,
+          creditsCharged: 0,
+          requiredCredits: 0,
+          shortfallCredits: 0,
+          lockDetail: {
+            locked: false,
+            showContent: true,
+            showUpgrade: false,
+            reason: null,
+            hint: null,
+            detail: null,
+          },
+        };
+
+    await route.fulfill({ json: apiEnvelope(response) });
+  });
+
   await page.route("**/api/payment/plans**", async (route) => {
     await route.fulfill({ json: apiEnvelope(paymentPlansResponse) });
   });
diff --git a/e2e/fixtures/test-data.ts b/e2e/fixtures/test-data.ts
index 04b7920e..0dadb344 100644
--- a/e2e/fixtures/test-data.ts
+++ b/e2e/fixtures/test-data.ts
@@ -207,6 +207,60 @@ export const paidImageUnlockHistoryResponse = {
   messageIds: [paidImageMessageId],
 };
 
+export const paidVoiceMessageId = "msg_voice_paywall_001";
+export const paidVoiceAudioUrl =
+  "data:audio/mpeg;base64,//uQZAAAAAAAAAAAAAAAAAAAAAAAWGluZwAAAA8AAAACAAACcQCA";
+
+export const paidVoiceHistoryResponse = {
+  messages: [
+    {
+      role: "assistant",
+      type: "voice",
+      content: "",
+      id: paidVoiceMessageId,
+      created_at: "2026-07-01T00:00:00.000Z",
+      audioUrl: paidVoiceAudioUrl,
+      image: {
+        type: null,
+        url: null,
+      },
+      lockDetail: {
+        locked: true,
+        showContent: true,
+        showUpgrade: true,
+        reason: "voice_message",
+        hint: "Unlock this voice message with credits.",
+        detail: null,
+      },
+    },
+  ],
+  total: 1,
+  limit: 50,
+  offset: 0,
+  isVip: false,
+  privateFreeLimit: 0,
+  privateUsedToday: 0,
+  privateCanViewFree: false,
+};
+
+export const insufficientCreditsUnlockVoiceResponse = {
+  unlocked: false,
+  content: "",
+  reason: "insufficient_balance",
+  creditBalance: 3,
+  creditsCharged: 0,
+  requiredCredits: 20,
+  shortfallCredits: 17,
+  lockDetail: {
+    locked: true,
+    showContent: true,
+    showUpgrade: true,
+    reason: "voice_message",
+    hint: "Unlock this voice message with credits.",
+    detail: null,
+  },
+};
+
 export const paymentPlansResponse = {
   plans: [
     {
diff --git a/e2e/specs/mock/voice-unlock-insufficient-credits.spec.ts b/e2e/specs/mock/voice-unlock-insufficient-credits.spec.ts
new file mode 100644
index 00000000..f0786dfb
--- /dev/null
+++ b/e2e/specs/mock/voice-unlock-insufficient-credits.spec.ts
@@ -0,0 +1,83 @@
+import { expect, test } from "@playwright/test";
+
+import { mockCoreApis } from "../../fixtures/api-mocks";
+import { paidVoiceMessageId } from "../../fixtures/test-data";
+
+test.beforeEach(async ({ baseURL, context, page }) => {
+  await context.clearCookies();
+
+  const client = await context.newCDPSession(page);
+  const origins = new Set([
+    new URL(baseURL ?? "http://127.0.0.1:3000").origin,
+    "http://127.0.0.1:3000",
+    "http://localhost:3000",
+  ]);
+  for (const origin of origins) {
+    await client
+      .send("Storage.clearDataForOrigin", {
+        origin,
+        storageTypes: "all",
+      })
+      .catch(() => {});
+  }
+
+  await mockCoreApis(page, {
+    paidVoiceInsufficientCreditsFlow: true,
+  });
+});
+
+test("user sees insufficient credits when unlocking a paid voice message and can navigate to subscription", async ({
+  page,
+}) => {
+  await signInWithEmailAndOpenChat(page);
+
+  const unlockButton = page.getByRole("button", {
+    name: "Unlock voice message",
+  });
+  await expect(unlockButton).toBeVisible({ timeout: 10_000 });
+
+  const unlockRequestPromise = page.waitForRequest(
+    "**/api/chat/unlock-private",
+  );
+  await unlockButton.click();
+
+  const unlockRequest = await unlockRequestPromise;
+  expect(unlockRequest.method()).toBe("POST");
+  expect(unlockRequest.postDataJSON()).toMatchObject({
+    messageId: paidVoiceMessageId,
+  });
+
+  const insufficientCreditsDialog = page.getByRole("dialog", {
+    name: "Not enough credits",
+  });
+  await expect(insufficientCreditsDialog).toBeVisible();
+  await expect(insufficientCreditsDialog.getByText("Balance")).toBeVisible();
+  await expect(insufficientCreditsDialog.getByText("Required")).toBeVisible();
+  await expect(insufficientCreditsDialog.getByText("Still needed")).toBeVisible();
+
+  await insufficientCreditsDialog
+    .getByRole("button", { name: "Top up now" })
+    .click();
+
+  await expect(page).toHaveURL(/\/subscription\?type=vip&returnTo=chat$/);
+});
+
+async function signInWithEmailAndOpenChat(
+  page: import("@playwright/test").Page,
+) {
+  await page.goto("/auth");
+
+  await page.getByRole("button", { name: /Other Sign In Options/i }).click();
+  await expect(
+    page.getByRole("dialog", { name: /Other sign-in options/i }),
+  ).toBeVisible();
+
+  await page.getByRole("button", { name: "Email Sign In" }).click();
+  await expect(page.getByPlaceholder("Email")).toHaveValue(
+    "chanwillian0@gmail.com",
+  );
+  await expect(page.getByPlaceholder("Password")).toHaveValue("12345678");
+
+  await page.getByRole("button", { name: "Login" }).click();
+  await expect(page).toHaveURL(/\/chat$/);
+}