
Open Exchange Rates serves current and historical foreign exchange rates for around 200 currencies over a JSON API.
Rates are aggregated market mid-rates intended for display, conversion, and reporting rather than for settling trades. Endpoints cover latest rates, a specific historical date, and time series. Update frequency depends on the plan, ranging from hourly to more frequent.

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

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

Stock, forex, and crypto data over REST and websockets, with a generous free tier.