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Micro User Service vs WhoisXML API Email Verification API

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

APIMicro User ServiceDEAD0WhoisXML API Email Verification APIDEAD0
Uptime · 30d
Uptime · 90d18.6%0.0%
Uptime · 30d0.0%0.0%
P50 · ms231—
P95 · ms827—
AuthapiKeyapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Micro User Service vs WhoisXML API Email Verification API: common questions

Which is more reliable, Micro User Service or WhoisXML API Email Verification API?

On our scheduled checks, Micro User Service leads on measured uptime — Micro User Service at 18.6% versus WhoisXML API Email Verification API at 0.0% 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 Micro User Service and WhoisXML API Email Verification API need an API key?

Both ask you to authenticate — Micro User Service 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 Micro User Service and WhoisXML API Email Verification API from the browser?

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

Are Micro User Service and WhoisXML API Email Verification API free for commercial use?

Micro User Service 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.