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Unirate vs Frankfurter

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

APIUnirateREACHABLE—FrankfurterHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
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

Unirate vs Frankfurter: common questions

Which is more reliable, Unirate or Frankfurter?

On our scheduled checks, Frankfurter leads on measured uptime — Unirate at —% versus Frankfurter 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 Unirate and Frankfurter need an API key?

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

Can I call Unirate and Frankfurter from the browser?

Yes — both Unirate and Frankfurter send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Unirate and Frankfurter free for commercial use?

Unirate 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.