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Adyen Checkout API vs Currencylayer

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

APIAdyen Checkout APINEW—CurrencylayerNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
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?

On our scheduled checks, Currencylayer leads on measured uptime — Adyen Checkout API at —% versus Currencylayer 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 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.