Every Free API You Need as a Developer (2025 Edition)

I've tested 100+ free APIs over the past month. Here are the ones actually worth using, organized by what you're building. Building a Financial App? API What You Get Auth CoinGecko 13,000+ crypto prices None Alpha Vantage Stock prices + 50 indicators Free key SEC EDGAR Every SEC filing ever None FRED 800K economic datasets Free key US Treasury National debt, spending None Open Exchange Rates Currency conversion None Python clients: coingecko | alpha-vantage | sec-edgar | fred Building a News/Content App? API What You Get Auth NewsAPI 80K+ news sources Free key Hacker News Top stories, comments None Dev.to Developer articles None Wikipedia Article content, search None arXiv Academic papers None Open Library Book data None Python clients: newsapi | hacker-news | wikipedia Building a Weather/Location App? API What You Get Auth Open-Meteo Forecasts + 80yr history None IP-API IP geolocation None REST Countries 250+ countries data None USGS Earthquakes Real-time seismic None Open Street Map