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PubMed E-utilities vs Userstack

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

APIPubMed E-utilitiesNEW—UserstackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limit3 req/window · 1 remainingUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

PubMed E-utilities vs Userstack: common questions

Which is more reliable, PubMed E-utilities or Userstack?

On our scheduled checks, Userstack leads on measured uptime — PubMed E-utilities at —% versus Userstack 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 PubMed E-utilities and Userstack need an API key?

PubMed E-utilities needs no key, while Userstack requires a free API key. If you want to start calling without signup, reach for PubMed E-utilities first.

Can I call PubMed E-utilities and Userstack from the browser?

Yes — both PubMed E-utilities and Userstack 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 PubMed E-utilities and Userstack free for commercial use?

PubMed E-utilities has unclear commercial terms, and Userstack 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.