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Phone Number Validator vs USGS Water Services

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

APIPhone Number ValidatorNEW—USGS Water ServicesNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedPublic domain (U.S. Government work)
Free tierFree — limits not publishedFree — no API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Phone Number Validator vs USGS Water Services: common questions

Which is more reliable, Phone Number Validator or USGS Water Services?

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

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

Can I call Phone Number Validator and USGS Water Services from the browser?

Yes — both Phone Number Validator and USGS Water Services send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Phone Number Validator and USGS Water Services free for commercial use?

Phone Number Validator has unclear commercial terms, and USGS Water Services allows commercial use on its free tier. 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.