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Frankfurter vs IBAN Validation API

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

APIFrankfurterHEALTHY—IBAN Validation APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licensePublic data (ECB reference rates)Unverified
Free tierUnlimited — abuse-rate-limited onlyFree — limits not published
Rate limitUnpublished, generousUnpublished
In directory since2026-05-022026-07-05
operationalpartialdownno data

Frankfurter vs IBAN Validation API: common questions

Which is more reliable, Frankfurter or IBAN Validation API?

On our scheduled checks, IBAN Validation API leads on measured uptime — Frankfurter at —% versus IBAN Validation API 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 Frankfurter and IBAN Validation API need an API key?

Neither needs a paid key — Frankfurter is callable with no signup, and IBAN Validation API is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Frankfurter and IBAN Validation API from the browser?

Yes — both Frankfurter and IBAN Validation API 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 Frankfurter and IBAN Validation API free for commercial use?

Frankfurter allows commercial use on its free tier, and IBAN Validation API has unclear commercial terms. 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.