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Use search when the broad directory stops being enough. Filter by category, auth, CORS, signup friction, and result freshness until the shortlist becomes obvious.
Start with category and auth when you know the integration shape. Use free, signup, and CORS flags when you are trying to remove setup friction.
Sort by verification or response time when the final call is about reliability, not just category fit.
3 results after 1 active filters. Remove any one below without losing the rest of the cut.
1Forge Finance APIs
1Forge Finance API provides real-time stock / forex / crypto quotes — targeting traders and financial app developers.
ExchangeRate-API
ExchangeRate-API provides real-time and historical exchange rates for 160+ currencies — free tier without API key, conversion calculations supported.
Polygon
Polygon.io API provides real-time and historical data for US stocks, forex, and crypto — quotes, candles, earnings, news, technical indicators.