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Free Public APIs API vs Web of Science API Expanded

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

APIFree Public APIs APIHEALTHY88Web of Science API ExpandedHEALTHY88
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%98.3%
P50 · ms878787
P95 · ms24191985
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Free Public APIs API vs Web of Science API Expanded: common questions

Which is more reliable, Free Public APIs API or Web of Science API Expanded?

On our scheduled checks, Free Public APIs API leads on measured uptime — Free Public APIs API at 100% versus Web of Science API Expanded at 99.02% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, Free Public APIs API or Web of Science API Expanded?

Web of Science API Expanded has the lower median latency in our checks — Free Public APIs API responds in 878 ms versus Web of Science API Expanded at 787 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 Free Public APIs API and Web of Science API Expanded need an API key?

Free Public APIs API needs no key, while Web of Science API Expanded requires a free API key. If you want to start calling without signup, reach for Free Public APIs API first.

Can I call Free Public APIs API and Web of Science API Expanded from the browser?

Only Free Public APIs API is browser-friendly — it returns CORS headers over HTTPS. Web of Science API Expanded needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Free Public APIs API and Web of Science API Expanded free for commercial use?

Free Public APIs API has unclear commercial terms, and Web of Science API Expanded 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.