
Vehicles information from Fundação Instituto de Pesquisas Econômicas - Fipe.
Brazilian Vehicles and Prices API is a free Vehicle API that requires no API key, is served over HTTPS and does not support CORS, so it should be called from a server.
API de Consulta Tabela FIPE fornece preços médios de veículos no mercado nacional através de um serviço RESTful HTTP Json. Atualizada mensalmente com dados extraidos da tabela FIPE
Details from deividfortuna.github.io.

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Yes. The Brazilian Vehicles and Prices API is listed in the Vehicle 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 Vehicles and Prices API requires no authentication, so you can start making requests without signing up.
Not directly. The Brazilian Vehicles and Prices API does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
Yes. The Brazilian Vehicles and Prices API is served over HTTPS, so it's safe to use in production.