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Adoptium vs APIs.guru

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

APIAdoptiumNEW—APIs.guruNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree and open, no key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Adoptium vs APIs.guru: common questions

Which is more reliable, Adoptium or APIs.guru?

On our scheduled checks, APIs.guru leads on measured uptime — Adoptium at —% versus APIs.guru 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 Adoptium and APIs.guru need an API key?

Neither needs a paid key — Adoptium is callable with no signup, and APIs.guru is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Adoptium and APIs.guru from the browser?

Yes — both Adoptium and APIs.guru send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Adoptium and APIs.guru free for commercial use?

Adoptium has unclear commercial terms, and APIs.guru 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.