All Banco do Brasil financial transaction APIs.
Banco do Brasil API is a free Finance API that requires OAuth authentication, is served over HTTPS and supports CORS, so it can be called from the browser.

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Which US business banking providers accept founders by country of residence, with sources
Yes. The Banco do Brasil API is listed in the Finance 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.
Yes. The Banco do Brasil API uses OAuth authentication, so you need to register for credentials before making requests.
Yes. The Banco do Brasil API supports CORS, so front-end JavaScript can call it directly.
Yes. The Banco do Brasil API is served over HTTPS, so it's safe to use in production.