FYI:
http://xmrtown4e5hj3yivdimt27np24atr7dyd7savkk6of5mdlykret7igqd.onion/
https://kbin.social/m/meta@monero.town/t/168770/Onion-instance-federation-very-limited
https://kbin.social/m/random/p/778378/Lemmy-Tor-guide-https-github-com-salif-lemmy-onion-service-I-have-just-tested-federation-with
I found it in kbin search:
https://kbin.social/search?q=tor+onion
deleted by creator