FastKYC
Merchant APIs

GST Verify API

Quickly verify a GST number and return the core business information, a lightweight validation built for high-volume merchant and vendor checks.

Illustration of a verified identity document representing the GST Verify API

What the GST Verify API does

GST Verify performs a straightforward GSTIN check and returns the business information registered against it.

It suits high-volume validation where you need to confirm a number is real and belongs to the expected business, without the fuller compliance picture the advanced endpoint provides.

Where teams use the GST Verify API

  1. Validating GSTINs at scale in a data cleaning run

  2. Inline validation on a merchant sign-up form

  3. Confirming a GSTIN before generating an invoice

  4. Lightweight checks where compliance depth is not needed

Frequently Asked Questions (FAQs)

Which GST endpoint should I use?

GST Verify for lightweight checks, GST Verification for standard onboarding, GST Advanced when compliance and turnover matter.

Does it confirm the registration is active?

Yes, current status is part of the core information returned.

Can I validate the format myself first?

You can check the fifteen-character structure locally to catch typos, but only a lookup confirms the registration exists.

Start verifying with the GST Verify API

Book a walkthrough and we will show the call, the response and how it fits your onboarding flow.

  • One API key for every check
  • Verified against official Indian records
  • Built for onboarding at scale
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