Brazilian Cryptocurrency Information.
MercadoBitcoin API is a free Cryptocurrency API that requires no API key, is served over HTTPS and has unconfirmed CORS support.

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Yes. The MercadoBitcoin API is listed in the Cryptocurrency 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 MercadoBitcoin API requires no authentication, so you can start making requests without signing up.
CORS support for the MercadoBitcoin API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The MercadoBitcoin API is served over HTTPS, so it's safe to use in production.