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Adyen Checkout API vs CongressInvests

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

APIAdyen Checkout APIHEALTHY95CongressInvestsHEALTHY92
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms418615
P95 · ms16671338
AuthapiKeyapiKey
CORSnoyes
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 CongressInvests: common questions

Which is more reliable, Adyen Checkout API or CongressInvests?

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

Adyen Checkout API has the lower median latency in our checks — Adyen Checkout API responds in 418 ms versus CongressInvests at 615 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 CongressInvests need an API key?

Both ask you to authenticate — Adyen Checkout API uses an API key and CongressInvests 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 CongressInvests from the browser?

Only CongressInvests 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 CongressInvests free for commercial use?

Adyen Checkout API has unclear commercial terms, and CongressInvests 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.