@paulrobertlloyd @sallylait @eleven_ty @Netlify You could certainly self host that piece. It's a function that formats requests between a couple of different APIs. Events on @Netlify can post to any URL.
The point of this example and stack is to save you from needing to host anything though, so it's twisting the model a bit.
My tweets and posts live here on my own domain these days.
You can explore them here and follow me on Mastodon instead of Twitter where I'm not currently active.