[dethos]

Some time ago I built a similar tool, with the main difference being that it doesn't store any data, so you need to have the webpage open to receive the request info. Since I use it mostly to debug issues and quickly inspect something of the fly, that works for me.

It is available here: https://github.com/dethos/webhook_logger

(You can quickly deploy it on your own server, if you don't trust a hosted service).