# Quick GST Number Validation: GSTIN Verify API | FastKYC

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

Source: https://www.fastkyc.com/apis/gst-verify/

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[Merchant APIs](/apis/merchant/)

# 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.

[Book a Demo](/book-demo/)

Category

[Merchant APIs](/apis/merchant/)

Built for

-   [Marketplaces & E-commerce](/industries/marketplaces/)
-   [Logistics & Mobility](/industries/logistics/)

## 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.

## Related APIs

-   [FSSAI Validation API Verify an FSSAI licence number and retrieve the food business's registration details, category and validity before onboarding restaurants or sellers.](/apis/fssai-validation/)
-   [GST Verification API Verify a GST number and retrieve the registered business name, address, status and registration details from GST records.](/apis/gst-verification/)
-   [Generate e-Way Bill API Generate a GST-compliant e-Way Bill from invoice and transport details, returning the bill number and validity so goods can move without delays.](/apis/generate-eway-bill/)
-   [GSTIN By Name API Find every GSTIN registered against a business name across Indian states, with the status of each registration, when a merchant can't share its GSTIN.](/apis/gst-by-name/)

## 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.

[Book a Demo](/book-demo/) [Browse All APIs](/apis/)

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