RSS, RDF and Atom in one consistent shape — the three dialects disagree about every element name and date format, so you never have to branch on feed type. Pay-per-call in USDC on Base (x402 v1+v2).
| Endpoint | Price | What it returns |
|---|---|---|
| /feed?url=https://hnrss.org/frontpage | $0.001 | Feed items: title, link, ISO date, author, summary |
| /discover?url=https://blog.rust-lang.org | $0.001 | The feeds a site declares in its HTML head |
Payment: send an X-PAYMENT header. Free: /health, /sources, /llms.txt, /openapi.json. A URL that is not a feed returns not_a_feed and is not charged. Pass since with your last poll time to fetch only what is new.