This subset of endpoints can be accessed via RSS. Note that filter query parameters will work.

Tagged Posts

The API exposes tagged posts as RSS at{tag}.

User Posts

A user's posts are exposed as RSS at{id}/posts.

Post Search

Post search results are exposed as RSS at

Channel Messages

Messages are exposed as RSS at{id}/messages.

Note that ?access_token={token} will have to be appended to non-public channels.