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Court Rules vs WhoisXML API Email Verification API

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

APICourt RulesDYING37WhoisXML API Email Verification APIDEAD0
Uptime · 30d
Uptime · 90d0.0%0.0%
Uptime · 30d0.0%0.0%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified
Free tierFree tier — API key required
Rate limitUnpublished
In directory since2026-10-042026-07-05
operationalpartialdownno data

Court Rules vs WhoisXML API Email Verification API: common questions

Which is more reliable, Court Rules or WhoisXML API Email Verification API?

Both are neck-and-neck — Court Rules and WhoisXML API Email Verification API each measure 0.0% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Do Court Rules and WhoisXML API Email Verification API need an API key?

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

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

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

Are Court Rules and WhoisXML API Email Verification API free for commercial use?

Court Rules 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.