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Check e-mail or username for a data breach vs IPWhois

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

APICheck e-mail or username for a data breachNEW—IPWhoisNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnoyes
HTTPSyesno
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key may be required for production
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Check e-mail or username for a data breach vs IPWhois: common questions

Which is more reliable, Check e-mail or username for a data breach or IPWhois?

On our scheduled checks, IPWhois leads on measured uptime — Check e-mail or username for a data breach at —% versus IPWhois 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 Check e-mail or username for a data breach and IPWhois need an API key?

Check e-mail or username for a data breach needs no key, while IPWhois requires a free API key. If you want to start calling without signup, reach for Check e-mail or username for a data breach first.

Can I call Check e-mail or username for a data breach and IPWhois from the browser?

Neither sends browser-friendly CORS headers reliably, so call Check e-mail or username for a data breach and IPWhois from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are Check e-mail or username for a data breach and IPWhois free for commercial use?

Check e-mail or username for a data breach has unclear commercial terms, and IPWhois 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.