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Adyen Checkout API vs Helium

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

APIAdyen Checkout APINEW—HeliumNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFirst 50 queries per IP free, no key (paid API key beyond, ~$0.02/query)
Rate limitUnpublished50 free queries per IP subnet
In directory since2026-07-052026-07-05
operationalpartialdownno data

Adyen Checkout API vs Helium: common questions

Which is more reliable, Adyen Checkout API or Helium?

On our scheduled checks, Helium leads on measured uptime — Adyen Checkout API at —% versus Helium 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 Helium need an API key?

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

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

Neither sends browser-friendly CORS headers reliably, so call Adyen Checkout API and Helium 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 Helium free for commercial use?

Adyen Checkout API has unclear commercial terms, and Helium 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.