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Adyen Checkout API vs Currencylayer

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

APIAdyen Checkout APIHEALTHY95CurrencylayerHEALTHY93
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms418511
P95 · ms1667967
AuthapiKeyapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Adyen Checkout API vs Currencylayer: common questions

Which is more reliable, Adyen Checkout API or Currencylayer?

Both are neck-and-neck — Adyen Checkout API and Currencylayer 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 Currencylayer?

Adyen Checkout API has the lower median latency in our checks — Adyen Checkout API responds in 418 ms versus Currencylayer at 511 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 Currencylayer need an API key?

Both ask you to authenticate — Adyen Checkout API uses an API key and Currencylayer uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

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

Neither sends browser-friendly CORS headers reliably, so call Adyen Checkout API and Currencylayer from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are Adyen Checkout API and Currencylayer free for commercial use?

Adyen Checkout API has unclear commercial terms, and Currencylayer 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.