Indian GST HSN and SAC classification code lookup and search.
India GST HSN & SAC 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.
Search HSN goods and SAC service classifications with a free, keyless JSON API. Tax rates are not supplied.
Details from gst-hsn-sac-api.vercel.app.

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The India GST HSN & SAC API is provided by India GST HSN & SAC API (gst-hsn-sac-api.vercel.app). Search HSN goods and SAC service classifications with a free, keyless JSON API. Tax rates are not supplied.
Yes. The India GST HSN & SAC 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 India GST HSN & SAC API requires no authentication, so you can start making requests without signing up.
Yes. The India GST HSN & SAC API supports CORS, so front-end JavaScript can call it directly.
Yes. The India GST HSN & SAC API is served over HTTPS, so it's safe to use in production.