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Banking API vs Frankfurter

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

APIBanking APIUNMONITORED—FrankfurterHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedPublic data (ECB reference rates)
Free tierFree tier — API key requiredUnlimited — abuse-rate-limited only
Rate limitUnpublishedUnpublished, generous
In directory since2026-07-052026-05-02
operationalpartialdownno data

Banking API vs Frankfurter: common questions

Which is more reliable, Banking API or Frankfurter?

Only Frankfurter is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do Banking API and Frankfurter need an API key?

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

Can I call Banking API and Frankfurter from the browser?

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

Are Banking API and Frankfurter free for commercial use?

Banking 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.