Brazil Central Bank Open Data.
Brazil Central Bank Open Data API is a free Government API that requires no API key, is served over HTTPS and has unconfirmed CORS support.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Consult companies by CNPJ for Brazilian companies
Official Spanish State Gazette open data: laws, summaries and XML/JSON APIs
Provides legislative information in Apis XML and JSON, as well as files in various formats
Yes. The Brazil Central Bank Open Data API is listed in the Government 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 Brazil Central Bank Open Data API requires no authentication, so you can start making requests without signing up.
CORS support for the Brazil Central Bank Open Data API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Brazil Central Bank Open Data API is served over HTTPS, so it's safe to use in production.