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Japan Invoice Registration Number Verifier
x402
Japan Invoice Registration Number Verifier is a paid API for AI agents from kaisha-api.hp-vladic.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Verifies a Japanese qualified invoice issuer registration number (インボイス登録番号) against the National Tax Agency dataset, returning registration status, registration date, and corporate details.
Price / call$0.01
Success—
StatusUnknown
How this service works
Verify a Japan qualified-invoice-issuer registration number (インボイス登録番号, "T" + 13 digits) against the National Tax Agency publication dataset. Returns registration status (active/cancelled/not found), registration date, and — for corporations — the registered name and corporate number. Includes corporate-number checksum validation. Essential for AP automation and expense agents processing Japanese invoices/receipts.
Output
Returns the registration status (active, cancelled, or not found), the registration date, and for corporations the registered business name and 13-digit corporate number. Also performs corporate-number checksum validation to catch malformed numbers.
Example use cases
Example prompt
“Can you verify that invoice registration number T1234567890123 is a valid and active qualified invoice issuer in Japan before I approve this payment?”
Technical details
Endpoint
GEThttps://kaisha-api.hp-vladic.workers.dev/invoice/verifyWhen to prefer
Use this endpoint when processing Japanese invoices or receipts that include an インボイス登録番号 and you need to confirm the issuer is legitimately registered under Japan's qualified invoice system (introduced October 2023). Ideal for AP automation agents, expense approval workflows, and ERP integrations handling Japanese vendors. Prefer over manual NTA website lookups when processing at scale.
Side effects
- Number not found in NTA dataset — returns 'not found' status
- Cancelled registration — returns 'cancelled' status with cancellation date
- Malformed T-number failing checksum — validation error returned
- Network or NTA dataset unavailability causing upstream errors
- Missing required 'number' query parameter returns a 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"name": "トヨタ自動車株式会社",
"entity": "corporation",
"status": "active",
"cancelDate": null,
"registered": true,
"formatValid": true,
"checksumValid": true,
"checkedAgainst": "2026-06-30",
"corporateNumber": "1180301018771",
"registrationDate": "2023-10-01",
"registrationNumber": "T1180301018771"
}
}Tags
x402
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