List 4PDA forum categories/subforums. With no forum_id, returns the top-level categories (the forum tree roots). With a forum_id, returns that forum's subforums and a summary of its topics. IDs are 4PDA forum IDs.

On rate limit, returns a 'rate_limited' payload with retry_after_seconds and retry_at_utc instead of an error — wait that long before calling again.

List topics in a 4PDA forum (lofi version): id, title, reply count, is_important (pinned/important topics are prefixed with (!) on the site).

On rate limit, returns a 'rate_limited' payload with retry_after_seconds and retry_at_utc instead of an error — wait that long before calling again.

List posts on a page of a 4PDA topic (lofi version), with author, date and HTML body. Internal links to the full version are rewritten to their lofi equivalent where one exists. The pinned header post repeats on every page on the site; it is dropped on page >= 2. Pages are 1-indexed; each page has 20 posts.

On rate limit, returns a 'rate_limited' payload with retry_after_seconds and retry_at_utc instead of an error — wait that long before calling again.