Frankfurter Currency Exchange Rates
Real-time and historical foreign exchange rates published by the European Central Bank (ECB). The Frankfurter API provides daily reference rates for 30+ currencies including USD, GBP, JPY, CHF, CAD, AUD, and many more, with historical data going back to January 4, 1999.
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What You Can Query
You can retrieve today's rates for any base currency (latest endpoint), look up rates for any specific historical date ({date} endpoint), and fetch daily time series across a date range with optional currency conversion ({start}..{end} endpoint). Rates are updated every working day around 16:00 CET. The API is free, open-source, requires no authentication, and has no usage limits.
What You Can Do
Convert amounts between international currencies at current or historical rates
Track how exchange rates between two currencies have changed over time
Compare exchange rates across multiple currencies for a specific date
Build financial models and forecasts using historical forex data
Analyze currency trends and volatility for business planning
Calculate cost differences for international purchasing or travel
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