How To Use This
Open the category you need and borrow only the complexity your idea can survive
Match the API to the problem statement. If the idea is about financial trends, start in
Market. If it depends on context, sentiment, or headlines, try News. If it needs public
datasets or civic information, Open Data is where the respectable spreadsheets live.
Start with one source. Your future debugging budget deserves mercy.
Market
Crypto and finance APIs for when your product needs numbers with consequences
Crypto data
- CoinGecko: huge coin coverage, historical prices, market data, and no API key drama to start.
- CryptoCompare: historical OHLC, blockchain data, and a little sentiment seasoning.
- Messari: richer metadata when you need more than “coin go up, coin go down.”
- CoinAPI: exchange-level detail and historical trades for people who enjoy precision.
- Nomics: clean structured market datasets if you like your data less feral.
Stocks and macro
- Alpha Vantage: stocks, forex, macro data, and enough history to make charts feel official.
- Financial Modeling Prep: statements, ratios, and company fundamentals.
- Twelve Data: real-time and historical market coverage without requiring spiritual preparation.
- Finnhub: earnings, fundamentals, insider data, and built-in news context.
- Nasdaq Data Link: broader financial and economic datasets when one feed stops being enough.
News
Context and sentiment feeds so your app knows the world has been busy
- NewsAPI: a broad starting point for article coverage and sentiment workflows.
- GNews: clean structured news when you want less wrestling and more building.
- The Guardian Open Platform: strong article archive with tagging and categories.
- Mediastack: useful if historical news matters and memory is part of the product.
- Marketaux: finance-focused news with sentiment tagging baked in.
Open Data
Public datasets for when one API endpoint is simply not enough suffering
- World Bank API: GDP, inflation, and other macro indicators that make dashboards look suspiciously well informed.
- IMF API: macroeconomic datasets for broader economic context.
- United Nations Data API: demographics, development, and international data sets with very civil-service energy.
- OpenDataSoft: thousands of globally sourced datasets in one ecosystem.
- Data.gov: the giant federal cupboard of open data, and yes, there is a lot in there.
Special
The side quests, oddities, and helper directories every builder eventually needs
Consumer and food data
Discovery and model tools
- Hugging Face: model access for NLP, classification, embeddings, and other modern data-adjacent wizardry.
- RapidAPI: useful when you need breadth more than elegance.
- Public APIs GitHub: an endless directory for your next questionable idea.