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IBAN Validation API vs Marketstack

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

APIIBAN Validation APINEW—MarketstackNEW—
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 Marketstack: common questions

Which is more reliable, IBAN Validation API or Marketstack?

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

IBAN Validation API needs no key, while Marketstack 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 Marketstack from the browser?

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

Are IBAN Validation API and Marketstack free for commercial use?

IBAN Validation API has unclear commercial terms, and Marketstack 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.