httppayai

x402-unit-convert

Unit conversion in one GET, without an LLM or a calculator: length, mass, volume, data and time, plus temperature. curl: GET /convert?value=1&from=km&to=m (from/to are unit names; temperature uses c|f|k). Response: {"input":{"value":1,"from":"km","to":"m"},"category":"length","result":1000,"unit":"m","formula":"1 km = 1000 m"}. The definitions are fixed in this Worker; no external service is called. Unknown units and cross-category pairs are refused with 400 before payment. 0.001 USDC, no account, no key, one GET, one delivery. A purchase is two calls by design: this first call returns 402 with the price and the payment terms, and you then repeat the same request with the PAYMENT-SIGNATURE header to receive the 200 delivery.