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Adyen Checkout API vs Frankfurter

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

APIAdyen Checkout APINEW—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

Adyen Checkout API vs Frankfurter: common questions

Which is more reliable, Adyen Checkout API or Frankfurter?

On our scheduled checks, Frankfurter leads on measured uptime — Adyen Checkout API 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 Adyen Checkout API and Frankfurter need an API key?

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

Can I call Adyen Checkout API and Frankfurter from the browser?

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

Are Adyen Checkout API and Frankfurter free for commercial use?

Adyen Checkout 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.