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About Frankfurter
Frankfurter serves current and historical foreign-exchange rates published by the European Central Bank — free, keyless, and open source.
Key features
- Latest and historical FX rates
- Time-series queries
- No API key
Pros
- Reliable central-bank data
- Trivially easy to use
Cons
- ECB reference rates only (daily)
- No crypto or intraday data
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