@SoniEx2 A client can implement URI handler, but how wep+ap URIs are created in the first place?
On the main page there is a table titled "Websites/server software and the Well-Known Protocol Handler". It says patches exist for Akkoma and Mastodon, but links to patches are not provided. There is also portend.place which doesn't work and is-a.cat which looks like a regular Mastodon instance