shipapis
StarSubmit an APISubmit API

Phone Number Validator vs USPTO

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

APIPhone Number ValidatorNEW—USPTONEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Phone Number Validator vs USPTO: common questions

Which is more reliable, Phone Number Validator or USPTO?

On our scheduled checks, USPTO leads on measured uptime — Phone Number Validator at —% versus USPTO 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 Phone Number Validator and USPTO need an API key?

Neither needs a paid key — Phone Number Validator is callable with no signup, and USPTO is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Phone Number Validator and USPTO from the browser?

Only Phone Number Validator is browser-friendly — it returns CORS headers over HTTPS. USPTO needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Phone Number Validator and USPTO free for commercial use?

Phone Number Validator has unclear commercial terms, and USPTO 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.