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APITube vs WhoisXML API Email Verification API

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

APIAPITubeNEW—WhoisXML API Email Verification APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierTrial — API key requiredFree tier — API key required
Rate limitPlan-dependentUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

APITube vs WhoisXML API Email Verification API: common questions

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

On our scheduled checks, WhoisXML API Email Verification API leads on measured uptime — APITube 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 APITube and WhoisXML API Email Verification API need an API key?

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

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

Are APITube and WhoisXML API Email Verification API free for commercial use?

APITube 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.