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IBAN Validation API vs Marketstack

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

APIIBAN Validation APIHEALTHY90MarketstackHEALTHY93
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms861470
P95 · ms21514068
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?

Both are neck-and-neck — IBAN Validation API and Marketstack each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, IBAN Validation API or Marketstack?

Marketstack has the lower median latency in our checks — IBAN Validation API responds in 861 ms versus Marketstack at 470 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 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.