
Indian Financial Systems Code (Bank Branch Codes).
Razorpay IFSC API is a free Finance API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
Explore Razorpay's documentation for Payments, POS, Banking Plus, Partners and Developer Tools.
Details from razorpay.com.

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The Razorpay IFSC API is provided by Razorpay (razorpay.com). Explore Razorpay's documentation for Payments, POS, Banking Plus, Partners and Developer Tools.
Yes. The Razorpay IFSC 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 Razorpay IFSC API requires no authentication, so you can start making requests without signing up.
CORS support for the Razorpay IFSC API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Razorpay IFSC API is served over HTTPS, so it's safe to use in production.