Brazil Receita WS
Consult companies by CNPJ for Brazilian companies
Provides legislative information in Apis XML and JSON, as well as files in various formats.
Brazilian Chamber of Deputies Open Data API is a free Government API that requires no API key, is served over HTTPS and does not support CORS, so it should be called from a server.
Baixe e analise dados sobre deputados, votações, projetos de lei e outros assuntos do Legislativo.
Details from dadosabertos.camara.leg.br.

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Consult companies by CNPJ for Brazilian companies
The Brazilian Chamber of Deputies Open Data API is provided by Dados Abertos da Câmara dos Deputados (dadosabertos.camara.leg.br). Baixe e analise dados sobre deputados, votações, projetos de lei e outros assuntos do Legislativo.
Yes. The Brazilian Chamber of Deputies 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 Brazilian Chamber of Deputies Open Data API requires no authentication, so you can start making requests without signing up.
Not directly. The Brazilian Chamber of Deputies Open Data API does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
Yes. The Brazilian Chamber of Deputies Open Data API is served over HTTPS, so it's safe to use in production.