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Card BIN/IIN lookup: network, issuer, country and card type for the first 6-8 digits.
CardBinCheck 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.
Free BIN lookup API with no API key and no registration. GET /api/bin/{bin} returns JSON with the card network, issuing bank, country, and funding type. 343,000+ BIN records, CORS enabled, 100 requests/day free.
Details from cardbincheck.com.

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The CardBinCheck API is provided by CardBinCheck (cardbincheck.com). Free BIN lookup API with no API key and no registration. GET /api/bin/{bin} returns JSON with the card network, issuing bank, country, and funding type. 343,000+ BIN records, CORS enabled, 100 requests/day free.
Yes. The CardBinCheck 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 CardBinCheck API requires no authentication, so you can start making requests without signing up.
Yes. The CardBinCheck API supports CORS, so front-end JavaScript can call it directly.
Yes. The CardBinCheck API is served over HTTPS, so it's safe to use in production.