Frankfurter
Free, open-source foreign-exchange rate API sourced from European Central Bank data, no key required.
Frankfurter is listed in Finance & Markets.
Key metrics
No published cap Rate limit Free and keyless; no published rate limit (ECB reference rates, updated on business days).
Gotchas
No gotchas documented yet. Contribute one if you know a constraint we missed.
Labels
- No auth
No auth
Callable with no API key or login — lowest-friction to integrate.
forex currency exchange-rates ecb open-source