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IBAN Validation API vs TaxID

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

APIIBAN Validation APINEW—TaxIDNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

IBAN Validation API vs TaxID: common questions

Which is more reliable, IBAN Validation API or TaxID?

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

IBAN Validation API needs no key, while TaxID requires a free API key. If you want to start calling without signup, reach for IBAN Validation API first.

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

Only IBAN Validation API is browser-friendly — it returns CORS headers over HTTPS. TaxID needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are IBAN Validation API and TaxID free for commercial use?

IBAN Validation API has unclear commercial terms, and TaxID 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.