Test Loops webhooks
Loops sends webhooks for contact and mailing list changes, email sends, and delivery, bounce, open, click, unsubscribe, and spam complaint events. Capture them on a free webhooks.cc endpoint to see exactly what Loops sends, then replay deliveries or forward them to your local handler.
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 Loops 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 Loops at your URL
Paste the endpoint URL into Loops: 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.
Loops webhook authentication
| Auth header | webhook-signature |
|---|---|
| Algorithm | HMAC-SHA256 |
| Verification in webhooks.cc | Capture deliveries to inspect raw signature material |
The header holds space-separated v1,{base64} entries, each an HMAC of {webhook-id}.{webhook-timestamp}.{raw body} keyed with the signing secret minus its whsec_ prefix, base64-decoded. After a secret roll, both secrets sign for 24 hours.
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
Loops webhook questions
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Your Loops webhook URL is seconds away
Sign up free, create an endpoint, and point Loops at it.
No credit card · or try without an account