Frankfurter vs IBAN Validation API
Same instrument, two spec sheets — measured, not claimed.
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 88.2% versus IBAN Validation API at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Which is faster, Frankfurter or IBAN Validation API?
Frankfurter has the lower median latency in our checks — Frankfurter responds in 370 ms versus IBAN Validation API at 861 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.
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.