You need to forward a single webhook to multiple destinations (fan-out).
You need to transform webhook, for example Docker push webhook into a Slack message.
Inputs represent your public endpoints. These are the unique URLs for instance, https://xyz.hooks.webhookrelay.com. Each input have several configuration options:
Domain name (configurable in all paid plans).
Static response code, headers and body.
Dynamic response coming from any destination (must respond within 10 seconds).
Each input can have an attached function which can modify response and request.
Outputs define your destination, where webhooks will be sent. These destinations can either be an HTTP server running on your local machine (http://localhost:8080) or a public server such as https://example.com.