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code402 ISIN Validator
x402
code402 ISIN Validator is a paid API for AI agents from hcrb.in, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-11).
Validates an ISIN (International Securities Identification Number) using offline deterministic checksum verification, returning validity, reason, country, 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 ISIN passes checksum), `reason` (human-readable explanation of why valid or not), `scope` (indicating checksum-verifiable vs format-only), `country` (ISO country code extracted from the ISIN prefix), and `normalized` (canonical form of the identifier). All checks are performed offline with no ML or external lookups.
Example use cases
Pre-trade securities identifier check
“Before we submit this order, can you verify that the ISIN GB0002634946 is valid and properly formed, including checksum?”
Compliance data pipeline enrichment
“I have an ISIN DE0005140008 from a third-party data feed — can you confirm it's a legitimate identifier and tell me what country it's registered in?”
User-submitted ISIN sanitization
“A user just entered the ISIN FR0000131104 on our platform — can you validate it and return the normalized canonical form so we can store it correctly?”
Technical details
Endpoint
POSThttps://hcrb.in/v1/tools/isin-check/call?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need fast, offline, deterministic ISIN validation with checksum verification — no network scraping, no ML, no registry lookup required. Ideal for compliance pipelines, pre-trade checks, and data ingestion workflows where you need a cryptographically-accountable signed receipt per call and pay-per-use micro-pricing ($0.005 USDC). First 3 calls/day are free.
Side effects
- Malformed or missing ISIN input returns valid=false with a descriptive reason
- ISIN with wrong length or non-alphanumeric characters fails format check before checksum
- Payment failure via x402 returns HTTP 402 before any validation is attempted
- Ambiguous or unsupported prefix may return scope as format-only rather than checksum-verifiable
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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