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IBAN Validation API vs Frankfurter

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

APIIBAN Validation APINEW—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

IBAN Validation API vs Frankfurter: common questions

Which is more reliable, IBAN Validation API or Frankfurter?

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

Neither needs a paid key — IBAN Validation API 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 IBAN Validation API and Frankfurter from the browser?

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

IBAN Validation API 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.