Test Zapier webhooks
Zapier sends webhooks from Zap actions: Webhooks by Zapier POST, PUT, and Custom Request steps deliver data from earlier Zap steps to any URL. Capture them on a free webhooks.cc endpoint to see exactly what Zapier sends, then replay deliveries or forward them to your local handler.
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Prefer a walkthrough? Read the local webhook testing guide.
How to test Zapier webhooks
- 1
Create a webhook endpoint
Sign in free with GitHub, Google, or email to create a persistent endpoint — or grab an instant guest URL at webhooks.cc without an account.
- 2
Point Zapier at your URL
Paste the endpoint URL into Zapier: Zap editor → Action → Webhooks by Zapier → POST, PUT, or Custom Request.
- 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.
Zapier webhook authentication
| Auth header | authorization |
|---|---|
| Algorithm | Basic auth |
| Verification in webhooks.cc | Capture deliveries to inspect raw signature material |
Zapier does not sign payloads. Each action can add custom headers and HTTP Basic auth (username and password or API key); every request carries User-Agent: Zapier, and Professional and higher plans can send from static IP ranges.
New to signature verification? Read the webhook signature verification guide.
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
Zapier webhook questions
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