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IsItWater vs ViaCep

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

APIIsItWaterNEW—ViaCepNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

IsItWater vs ViaCep: common questions

Which is more reliable, IsItWater or ViaCep?

On our scheduled checks, ViaCep leads on measured uptime — IsItWater at —% versus ViaCep 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 IsItWater and ViaCep need an API key?

ViaCep needs no key, while IsItWater requires a free API key. If you want to start calling without signup, reach for ViaCep first.

Can I call IsItWater and ViaCep from the browser?

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

Are IsItWater and ViaCep free for commercial use?

IsItWater has unclear commercial terms, and ViaCep 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.