Overview
Postmon is a free, open-source API for looking up Brazilian ZIP codes (CEP) and getting structured address information. Simply provide a ZIP code and receive the street name, neighborhood, city, and state — no API key required. It also supports package tracking for select Brazilian carriers.
Beginner Tip
Postmon returns HTTP 404 when a ZIP code is not found instead of an error message in the body, so check the HTTP status code first in your error handling rather than parsing the response body.
Available Data
The kind of data this API exposes, based on its documentation. We could not call the endpoint to confirm the exact field names.
Example Response
Illustrative shape only — we were not able to call this endpoint (it requires credentials or exposes no public sample URL), so the fields below show the kind of data this API returns rather than a recorded response.
{
"status": "success",
"data": {
"result": "Data from Postmon",
"description": "An API to query Brazilian ZIP codes and orders easily, quickly and free",
"timestamp": "2025-01-15T10:00:00Z"
}
} Field Reference
cep The queried ZIP code in 00000-000 format logradouro Street name or address line for this ZIP code area bairro Neighborhood or district name cidade City name where this ZIP code is located estado Brazilian state abbreviation (e.g., "SP", "RJ", "MG") estado_info Additional state details including full name and area code Implementation Example
Calls a real endpoint of this API. Replace any placeholder credentials with your own key.
const url = "https://api.postmon.com.br/v1/cep/01310100";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data); What Can You Build?
Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.
Common Errors & Troubleshooting
Generated guidance based on this API's documentation, not observed by us. Treat it as a starting point and check against the provider's own error reference.
Metadata Score Breakdown
Estimated from metadata — endpoint not independently tested
Metadata estimate · endpoint not independently tested
Technical Specifications
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