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Banking API vs Frankfurter

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

APIBanking APIHEALTHY98FrankfurterHEALTHY86
Uptime · 30d
Uptime · 90d100%88.2%
Uptime · 30d100%87.9%
P50 · ms214370
P95 · ms14354986
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?

On our scheduled checks, Banking API leads on measured uptime — Banking API at 100% versus Frankfurter at 88.2% 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, Banking API or Frankfurter?

Banking API has the lower median latency in our checks — Banking API responds in 214 ms versus Frankfurter at 370 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 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.