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code402 Japan Corporate Number Validator
x402
code402 Japan Corporate Number Validator is a paid API for AI agents from hcrb.in, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-12).
Performs offline deterministic validation of Japanese corporate registration numbers (法人番号) using checksum and format rules, returning validity, reason, normalized form, and scope.
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
A JSON object with: `valid` (boolean indicating pass/fail), `reason` (human-readable explanation of why it passed or failed), `normalized` (standardized form of the identifier), `scope` (whether the check was checksum-verifiable or format-only), `country` (JP), and `tool` (identifier of the tool used). No external data sources or ML are involved — purely deterministic rule-based output.
Example use cases
KYB check for Japanese supplier
“I'm onboarding a new supplier from Japan — their corporate number is 9010001020722. Can you verify it's a real, valid Japanese business registration number before I proceed?”
Bulk vendor data cleanup
“We have a list of Japanese company numbers from our CRM and some might be malformed. Can you validate 3011101051091 and tell me if it passes the checksum and what the normalized version looks like?”
Compliance due diligence filing
“Before I submit this cross-border contract, I need to confirm that 7000012050002 is a properly formatted and checksum-valid Japanese corporate registration number — can you run the offline deterministic check?”
Technical details
Endpoint
POSThttps://hcrb.in/v1/tools/japan-corp-check/call?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, offline, deterministic check of a Japanese corporate registration number without relying on external databases, ML models, or web scraping. Ideal for KYB pipelines, compliance workflows, and data hygiene tasks where you need a reproducible, auditable result with a signed receipt. Prefer over live registry lookups when latency, privacy, or cost is a concern, and you only need format/checksum validity rather than live registry confirmation.
Side effects
- Invalid or malformed input string returns valid: false with a descriptive reason
- Non-Japanese corporate number format returns format mismatch error
- Payment failure via x402 if USDC balance insufficient (after first 3 free calls/day)
- Network timeout on POST if the endpoint is temporarily unreachable
- Missing required body parameters may return a 400-level error
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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