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ExchangeRate-API (open) vs Frankfurter

Same instrument, two spec sheets — measured, not claimed.

APIExchangeRate-API (open)NEW—FrankfurterHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedPublic data (ECB reference rates)
Free tierFree — limits not publishedUnlimited — abuse-rate-limited only
Rate limitUnpublishedUnpublished, generous
In directory since2026-07-052026-05-02
operationalpartialdownno data

ExchangeRate-API (open) vs Frankfurter: common questions

Which is more reliable, ExchangeRate-API (open) or Frankfurter?

On our scheduled checks, Frankfurter leads on measured uptime — ExchangeRate-API (open) at —% versus Frankfurter at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do ExchangeRate-API (open) and Frankfurter need an API key?

Neither needs a paid key — ExchangeRate-API (open) is callable with no signup, and Frankfurter is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call ExchangeRate-API (open) and Frankfurter from the browser?

Yes — both ExchangeRate-API (open) and Frankfurter send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are ExchangeRate-API (open) and Frankfurter free for commercial use?

ExchangeRate-API (open) has unclear commercial terms, and Frankfurter allows commercial use on its free tier. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.