One rule above all: it must be genuinely free — a real free tier or fully keyless. Every submission gets called live by us before it is listed, and its status stays public forever.
Paste a sample endpoint URL — your browser will try calling it right now. A pass here almost always means a pass with us.
Send the API name, its docs URL and one working sample endpoint. We test within a few days and reply either way.
Submit via email →Listing is free and always will be. API owners can also grab their live-verified badge from their listing page — it keeps backlinks honest on both sides.