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webhook.co gives you a free, permanent, signed webhook URL with payload inspection and one-command replay-to-localhost — then grows with you into inbound ingestion (verify → dedup → retry → replay) and outbound delivery. Every capability is reachable identically across the CLI, API, web, and MCP. Signing and verification follow the Standard Webhooks spec, for both send and receive.

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The API

The REST API lives at https://api.webhook.co. It’s a small, predictable surface — every endpoint is described by a machine-readable OpenAPI 3.1 document you can browse in the API reference or fetch yourself: 
curl https://api.webhook.co/openapi.json
That same document is what the SDKs and the API reference on this site are generated from, so they never drift from the real API.

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SDKs

Official, typed SDKs in three languages — each with the same hardening built in (bearer auth, bounded retries with jitter, cursor pagination, idempotency, and secret redaction):

TypeScript

npm install @webhook-co/sdk

Python

pip install webhook-co

Go

go get github.com/webhook-co/webhook-go

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Next

Quickstart

Create an endpoint and list its events in a few lines.

Authentication

How the whk_ API key works.