Which US business banking providers accept founders by country of residence, with sources.
Banking Access Index API is a free Finance API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Which US business banking providers accept non-US-resident founders of US LLCs: 19 providers × 8 countries of residence, 257 verified claims, every cell cited to a provider source. Free CC BY 4.0 dataset (CSV/JSON).
Details from globalsolo.global.

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The Banking Access Index API is provided by Global Solo (globalsolo.global). Which US business banking providers accept non-US-resident founders of US LLCs: 19 providers × 8 countries of residence, 257 verified claims, every cell cited to a provider source. Free CC BY 4.0 dataset (CSV/JSON).
Yes. The Banking Access Index 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.
No. The Banking Access Index API requires no authentication, so you can start making requests without signing up.
Yes. The Banking Access Index API supports CORS, so front-end JavaScript can call it directly.
Yes. The Banking Access Index API is served over HTTPS, so it's safe to use in production.