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Web of Science API Expanded vs xAI Grok API

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

APIWeb of Science API ExpandedNEW—xAI Grok APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Web of Science API Expanded vs xAI Grok API: common questions

Which is more reliable, Web of Science API Expanded or xAI Grok API?

On our scheduled checks, xAI Grok API leads on measured uptime — Web of Science API Expanded at —% versus xAI Grok 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 Web of Science API Expanded and xAI Grok API need an API key?

Both ask you to authenticate — Web of Science API Expanded uses an API key and xAI Grok API 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 Web of Science API Expanded and xAI Grok API from the browser?

Neither sends browser-friendly CORS headers reliably, so call Web of Science API Expanded and xAI Grok API from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are Web of Science API Expanded and xAI Grok API free for commercial use?

Web of Science API Expanded has unclear commercial terms, and xAI Grok 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.