It's very useful - I'm using it to send notifications of google form submissions to discord - but the 'free' plan is fairly limited.

When developing locally, I'm using it as an endpoint for capturing REST api calls from third-party sites that cannot send data to my laptop (e.g. API calls from on-submit scripts in Google Forms). Works well.

I'm equally curious.

Active user workflows are an always-on testing infrastructure for our supported API integrations. We usually know about API changes in advance but, if not, we will generally see any issues very quickly.