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Adyen Checkout API vs Exchange Rates API

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

APIAdyen Checkout APIHEALTHY95Exchange Rates APIHEALTHY88
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms418810
P95 · ms16674162
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Adyen Checkout API vs Exchange Rates API: common questions

Which is more reliable, Adyen Checkout API or Exchange Rates API?

Both are neck-and-neck — Adyen Checkout API and Exchange Rates API 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, Adyen Checkout API or Exchange Rates API?

Adyen Checkout API has the lower median latency in our checks — Adyen Checkout API responds in 418 ms versus Exchange Rates API at 810 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 Adyen Checkout API and Exchange Rates API need an API key?

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

Can I call Adyen Checkout API and Exchange Rates API from the browser?

Only Exchange Rates API 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 Exchange Rates API free for commercial use?

Adyen Checkout API has unclear commercial terms, and Exchange Rates API 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.