Brazil RESTful API to find information about streets, zip codes, neighborhoods, cities and states.
Cep.la API is a free Geocoding API that requires no API key, is only available over HTTP and has unconfirmed CORS support.
Details from cep.la.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Convert British OSGB36 easting and northing (British National Grid) to WGS84 latitude and longitude
World countries, states, regions, provinces, cities & towns in JSON, SQL, XML, YAML, & CSV format
The Cep.la API is provided by cep.la (cep.la).
Yes. The Cep.la API is listed in the Geocoding category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The Cep.la API requires no authentication, so you can start making requests without signing up.
CORS support for the Cep.la API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
No. The Cep.la API is only available over plain HTTP, which browsers block on HTTPS sites. Call it from a server instead.