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HasData: Structured Web Data APIs vs WhoisXML API Email Verification API

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

APIHasData: Structured Web Data APIsNEW—WhoisXML API Email Verification APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesyes
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

HasData: Structured Web Data APIs vs WhoisXML API Email Verification API: common questions

Which is more reliable, HasData: Structured Web Data APIs or WhoisXML API Email Verification API?

On our scheduled checks, WhoisXML API Email Verification API leads on measured uptime — HasData: Structured Web Data APIs at —% versus WhoisXML API Email Verification 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 HasData: Structured Web Data APIs and WhoisXML API Email Verification API need an API key?

Both ask you to authenticate — HasData: Structured Web Data APIs uses an API key and WhoisXML API Email Verification 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 HasData: Structured Web Data APIs and WhoisXML API Email Verification API from the browser?

Yes — both HasData: Structured Web Data APIs and WhoisXML API Email Verification API send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are HasData: Structured Web Data APIs and WhoisXML API Email Verification API free for commercial use?

HasData: Structured Web Data APIs has unclear commercial terms, and WhoisXML API Email Verification 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.