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WhoisXML API Email Verification API vs Wikidata

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

APIWhoisXML API Email Verification APINEW—WikidataNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

WhoisXML API Email Verification API vs Wikidata: common questions

Which is more reliable, WhoisXML API Email Verification API or Wikidata?

On our scheduled checks, Wikidata leads on measured uptime — WhoisXML API Email Verification API at —% versus Wikidata 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 WhoisXML API Email Verification API and Wikidata need an API key?

Wikidata needs no key, while WhoisXML API Email Verification API requires a free API key. If you want to start calling without signup, reach for Wikidata first.

Can I call WhoisXML API Email Verification API and Wikidata from the browser?

Only WhoisXML API Email Verification API is browser-friendly — it returns CORS headers over HTTPS. Wikidata 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 Wikidata free for commercial use?

WhoisXML API Email Verification API has unclear commercial terms, and Wikidata 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.