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GSTIN Validator (code402)
x402
GSTIN Validator (code402) is a paid API for AI agents from hcrb.in, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-12).
Validates an Indian Goods and Services Tax Identification Number (GSTIN) using offline deterministic checksum logic, returning validity, reason, and normalized form.
Price / call$0.005
Success—
StatusUnknown
How this service works
Offline deterministic checks (no ML, no scraping) for business identifiers and rental due-diligence, paid per call via x402 (gasless EIP-3009 USDC on Base). Checksum-verifiable (IBAN, LEI, VAT, ABA, ISBN, SEDOL…) vs format-only (EIN, IFSC, SWIFT/BIC…) — every response returns a scope field. Non-custodial, signed receipts. First 3 calls/day free.
Output
Returns a JSON object with: `valid` (boolean indicating whether the GSTIN passed validation), `reason` (human-readable explanation such as 'checksum valid' or error detail), `scope` (indicating whether validation was checksum-verifiable or format-only), `normalized` (cleaned canonical form of the identifier), and `country` (always India for GSTIN). Also echoes `tool` name.
Example use cases
Supplier onboarding tax verification
“Before we add this vendor to our system, can you verify that their GSTIN '29AADCB2230M1ZP' is valid and correctly formatted?”
Invoice processing compliance check
“We received an invoice with GSTIN '07AAACR5055K1Z5' — can you validate it so we know it's a legitimate GST number before we pay?”
Bulk vendor data cleanup
“I have a vendor record with GSTIN '19AABCT3518Q1ZV' — please check if the checksum is valid and give me the normalized form so I can update our database.”
Technical details
Endpoint
POSThttps://hcrb.in/v1/tools/gstin-check/call?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need fast, offline, deterministic validation of Indian GSTINs without relying on government API lookups or ML models. Ideal for invoice processing pipelines, vendor onboarding, and B2B compliance checks where you need a checksum-level verification with a signed receipt and per-call micropayment via USDC — not a live registry lookup.
Side effects
- Invalid or malformed GSTIN input returns valid:false with a descriptive reason
- Missing required input field returns an error response
- Payment failure via x402 (insufficient USDC balance) blocks the call after the 3 free daily calls are exhausted
- Network timeout if the endpoint is temporarily unreachable
- Non-GSTIN identifiers passed to this endpoint return format validation errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | object |
Output
Schema · Response
{
"type": "json",
"schema": {
"type": "object",
"required": [
"valid",
"reason"
],
"properties": {
"tool": {
"type": "string"
},
"scope": {
"type": "string"
},
"valid": {
"type": "boolean"
},
"reason": {
"type": "string"
},
"country": {
"type": "string"
},
"normalized": {
"type": "string"
}
}
},
"example": {
"valid": true,
"reason": "checksum valid"
}
}Tags
x402
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