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ISO 3166 Updates API vs ViaCep

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

APIISO 3166 Updates APINEW—ViaCepNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limit500 req/windowUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ISO 3166 Updates API vs ViaCep: common questions

Which is more reliable, ISO 3166 Updates API or ViaCep?

On our scheduled checks, ViaCep leads on measured uptime — ISO 3166 Updates API 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 ISO 3166 Updates API and ViaCep need an API key?

Neither needs a paid key — ISO 3166 Updates API is callable with no signup, and ViaCep is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call ISO 3166 Updates API and ViaCep from the browser?

Yes — both ISO 3166 Updates API and ViaCep 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 ISO 3166 Updates API and ViaCep free for commercial use?

ISO 3166 Updates API 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.