For the complete documentation index, see llms.txt.
3 endpoints
Engineering API
Same bearer token, same credit pool, same JSON envelope as every other endpoint —
drop them into apps, sites, workflows, or agents without rebuilding formulas, validation, or docs.
940 ready-made endpoints — calculators, converters, text, hashes, finance —
behind one key, one stable JSON envelope, and a fixed credit cost.
Built for apps, sites, and AI agents.
1Try it right here — every tool page has a playground with a prefilled test key. No signup.
2Get your own key by email — 1,000 free calls every month, no card required.
3Ship it — copy-paste snippets in 7 languages, or connect AI agents via MCP.