Webhooks API — free mock REST API for testing

A real webhook dispatcher. Register a subscription, trigger an event, and the backend sends an actual HTTP POST to your URL (try https://webhook.site). Inspect delivery attempts, replay failures, and verify the real HMAC-SHA256 payload signature sent in the X-FunAPI-Signature header.

The Webhooks API is the receiving end of the problem: register a callback URL, trigger an event, then inspect exactly what was delivered and replay it. Deliveries are signed with an HMAC, so you can practise verifying a signature — including the constant-time comparison and the replay window that separate a real verifier from a string equality check.

Base URL: https://funapi.dev/api/webhooks/v1 · 7 endpoints · OpenAPI 3.1 spec and Postman collection available. New here? Read the getting started guide.

What you can practise here

subscriptions

who gets notified, and for what

deliveries

attempts, replays, and signature checks

All 39 mock REST APIs

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