ViaCEP
FreeLiveLast verified 24 Sept 2026
Looks up Brazilian street addresses and IBGE/DDD codes by postal code (CEP), no key needed.
Example request
curl -s 'https://viacep.com.br/ws/01001000/json/'
Free tier, in plain English
Free to use with no key and no published rate limit, though the provider warns heavy automated abuse can get you blocked.
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