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WhoisXML API Email Verification API vs xAI Grok API

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

APIWhoisXML API Email Verification APIDEAD0xAI Grok APIDEAD0
Uptime · 30d
Uptime · 90d0.0%0.0%
Uptime · 30d0.0%0.0%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesno
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

WhoisXML API Email Verification API vs xAI Grok API: common questions

Which is more reliable, WhoisXML API Email Verification API or xAI Grok API?

Both are neck-and-neck — WhoisXML API Email Verification API and xAI Grok API each measure 0.0% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Do WhoisXML API Email Verification API and xAI Grok API need an API key?

Both ask you to authenticate — WhoisXML API Email Verification API 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 WhoisXML API Email Verification API and xAI Grok API from the browser?

Only WhoisXML API Email Verification API is browser-friendly — it returns CORS headers over HTTPS. xAI Grok API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are WhoisXML API Email Verification API and xAI Grok API free for commercial use?

WhoisXML API Email Verification API 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.