api.data.gov
FreeDegradedNot yet verified
One free key unlocks 450+ US federal agency APIs (NASA, NOAA, FDA, and more).
Example request
curl -H 'X-Api-Key: $API_KEY' 'https://api.nasa.gov/planetary/apod'
Free tier, in plain English
Free signup gives one API key that works across all 450+ participating federal APIs, 1,000 req/hr by default.
Alternatives in Open Government Data
API ColombiaColombia reference data: departments, cities, tourist sites, airports, presidents and more.ApiverketSingle API for 35+ Swedish agencies: weather, statistics, transport, companies, parliament and more.FreemiumArgentinaDatosArgentine holidays, inflation, interest rates, and Congress voting data from public sources.FreeAyes and NoesUK MPs, parties, Commons voting records and Early Day Motions, built on official Parliament data.FreeBCLawsFull text and structure of British Columbia's statutes, regulations and municipal bylaws as XML.