You can run your own instance in the official sandbox network today: https://atproto.com/blog/federation-developer-sandbox https://atproto.com/blog/federation-d

You can run your own instance in the official sandbox network today: https://atproto.com/blog/federation-developer-sandbox https://atproto.com/blog/federation-developer-sandbox There are of course significantly less users compared to the main instance, but it should give you some confidence that federation dev work is on the right track.