How do I test Mux webhooks without deploying anything?

Create a free endpoint on webhooks.cc — sign in with GitHub or Google, or use a guest endpoint without an account — then configure it as your webhook URL: Mux Dashboard → Settings → Webhooks. Every delivery shows up live in the dashboard with full headers, body, and query parameters. To hit a local server, run whk tunnel and the CLI forwards each webhook to localhost.

Can I send a sample Mux webhook without a Mux account?

Yes. webhooks.cc ships Mux templates (video.asset.created, video.asset.ready, video.upload.asset_created) with realistic payloads and correctly computed signature headers. Send them from the dashboard, the SDK, or the MCP server to exercise your handler end-to-end.

How do I verify Mux webhook signatures?

Mux signs each delivery with the mux-signature header using HMAC-SHA256. webhooks.cc verifies these signatures for you: add your signing secret to the endpoint and every captured request is marked valid or invalid in the dashboard.

Is the Mux webhook tester free?

Yes. A free account gets you persistent endpoints, 50 requests per day, 7-day retention, and full CLI, SDK, and MCP access — no credit card. You can also try a guest endpoint without an account: up to 25 requests for 12 hours.

MUX

Test Mux webhooks

Mux sends webhooks for video asset lifecycle events — uploads, processing, ready states, and live streams. Capture them on a free webhooks.cc endpoint to see exactly what Mux sends — or fire realistic, correctly signed sample payloads at your own handler without touching a production account.

Start free:

No credit card · 50 requests/day free · or get a guest URL without an account

Prefer a walkthrough? Read the local webhook testing guide.

How to test Mux webhooks

1
Create a webhook endpoint
Sign in free with GitHub or Google to create a persistent endpoint — or grab an instant guest URL at webhooks.cc/go without an account.
2
Point Mux at your URL
Paste the endpoint URL into Mux: Mux Dashboard → Settings → Webhooks.
3
Inspect what arrives
Each delivery appears live in the dashboard with method, headers, body, query parameters, and source IP.
4
Forward to localhost or assert in CI
Run whk tunnel <port> to forward webhooks to a local server, or use the TypeScript SDK to wait for and assert on deliveries in tests.

Mux webhook signature

Signature header	mux-signature
Algorithm	HMAC-SHA256
Verification in webhooks.cc	Supported — add your signing secret and every request is checked automatically

New to signature verification? Read the webhook signature verification guide.

Send sample Mux events

These Mux templates ship with realistic payloads and valid signature headers. Send them from the dashboard's Send button, the SDK, or your AI agent via MCP.

video.asset.createdvideo.asset.readyvideo.upload.asset_created

# Send a signed Mux sample with the SDK
await client.endpoints.sendTemplate( slug, {
  provider: "mux",
  template: "video.asset.created",
  secret: "your-test-secret",
});

Everything in one place

Live dashboard — see deliveries the moment they arrive
Forward to localhost with whk tunnel
Replay any captured request to any URL
Mock responses with custom status, headers, and body
TypeScript SDK assertions for CI
MCP server for AI coding agents

Mux webhook questions

Your Mux webhook URL is seconds away

No credit card · or try without an account

Test Mux webhooks

How to test Mux webhooks

Create a webhook endpoint

Point Mux at your URL

Inspect what arrives

Forward to localhost or assert in CI

Mux webhook signature

Send sample Mux events

Everything in one place

Mux webhook questions

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