
Free market data API covering equities, forex, crypto, and technical indicators.
Alpha Vantage provides a free market data API covering equities, forex, and cryptocurrencies, with a large library of technical indicators and economic indicator series.
Output is available as JSON or CSV. The free tier is rate-limited, and real-time coverage is more limited than paid vendors. It is commonly used for prototypes, learning projects, and low-volume tools.

Real-time and historical market data for stocks, options, forex, and crypto over low-latency websockets.

Reliable, up-to-date currency data and exchange rates API.

Real-time market data, fundamentals, and alternative data with a usable free tier.