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PubMed E-utilities vs RSQ API

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

APIPubMed E-utilitiesNEW—RSQ APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesno
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limit3 req/window · 1 remainingUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

PubMed E-utilities vs RSQ API: common questions

Which is more reliable, PubMed E-utilities or RSQ API?

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

Neither needs a paid key — PubMed E-utilities is callable with no signup, and RSQ API is callable with no signup. Both are quick to prototype with; rate limits still apply.

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

Only PubMed E-utilities is browser-friendly — it returns CORS headers over HTTPS. RSQ API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are PubMed E-utilities and RSQ API free for commercial use?

PubMed E-utilities has unclear commercial terms, and RSQ API 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.