For real-time lookups rather than a bulk download, the Back4app Brazilian Zip Codes Database offers API access for integrating CEP data into apps. Ideas for "Making a Piece"
If you are looking to create an art piece or visualization using this data, here are a few directions: Download Brazil Shapefiles: Municipalities & Zip codes Download Brazil zip
You can find specific postal code lists on DataHub (covering major locations) or more comprehensive, paid datasets with over 1.3 million records at GeoPostcodes . For real-time lookups rather than a bulk download,