Resolve an IBAN to its bank name, BIC, city and address for 60+ countries.
IBAN Analyzer 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.
Turn an IBAN into the bank behind it - name, BIC, city, address. Free, no key, CORS enabled.
Details from iban-analyzer.com.

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The IBAN Analyzer API is provided by IBAN Analyzer (iban-analyzer.com). Turn an IBAN into the bank behind it - name, BIC, city, address. Free, no key, CORS enabled.
Yes. The IBAN Analyzer 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 IBAN Analyzer API requires no authentication, so you can start making requests without signing up.
Yes. The IBAN Analyzer API supports CORS, so front-end JavaScript can call it directly.
Yes. The IBAN Analyzer API is served over HTTPS, so it's safe to use in production.