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Japan Corporate-Number API (x402)
x402
Japan Corporate-Number API (x402) is a paid API for AI agents from houjin.agentic-jp.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).
Looks up and verifies Japanese corporations from the National Tax Agency registry using fuzzy name search, returning confidence scores and full corporate details.
Price / call$0.005
Success—
StatusUnknown
How this service works
KYB / KYC verification of a Japanese company: reconcile a company name (+ optional address) against the official JP corporate registry (名寄せ). Returns ranked candidate 法人番号 with a 0-1 confidence score, handling 株式会社 / (株) / ㈱ spelling variation and matching Japanese or English names. A dissolved corporation is never reported as `verified` even on an exact name match. Use it to confirm a vendor, customer, or invoice counterparty.
Output
Returns a verified boolean, a best-match candidate with confidence score (0–1), and full corporation details including official name, corporate number, status (active/closed), address components (prefecture, city, street, postal code), corporation kind, assignment date, and update date. Also returns a candidates array for fuzzy matches with match flags for name, city, and prefecture.
Example use cases
KYB check for new vendor
“We're onboarding a new Japanese supplier called トヨタ自動車株式会社 in Aichi prefecture — can you confirm they're an active registered corporation and get their official 法人番号?”
Confirm corporate number before wire transfer
“Before I approve this payment, can you verify that corporate number 7000012050002 actually belongs to 国立印刷局 in 港区, Tokyo?”
Disambiguate common company name
“I need to find the official registry details for a Japanese company named 東京商事 — they're located in Shinjuku, Tokyo. Can you look them up and get their corporate number and status?”
Technical details
Endpoint
POSThttps://houjin.agentic-jp.com/verifyWhen to prefer
Use this endpoint when you need to verify, look up, or reconcile Japanese corporate entities against the authoritative National Tax Agency registry. Ideal for KYB/compliance workflows, vendor onboarding, and payment due-diligence involving Japanese companies. Prefer over general web search when you need an authoritative, structured registry result with a confidence score. The x402 pay-per-call model (no API key required) makes it convenient for ad-hoc or infrequent lookups without subscription overhead.
Side effects
- No matching corporation found — returns empty candidates array and verified: false
- Multiple low-confidence candidates — returns candidates list without a clear best match
- Payment failure via x402 — call not processed if USDC payment is not confirmed
- Ambiguous name requiring prefecture/city disambiguation — confidence score below threshold
- Invalid or non-existent corporate number provided — mismatch returned with verified: false
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| city | string | City / ward, to disambiguate. Optional. |
| name | string | Corporation name to reconcile against the registry. Required. |
| prefecture | string | Prefecture, to disambiguate. Optional. |
| corporate_number | string | A 法人番号 the caller wants confirmed against the name/address. Optional. |
Output
Schema · Response
{
"type": "json",
"example": {
"best": {
"matched": {
"city": true,
"name": true,
"name_exact": true,
"prefecture": true
},
"confidence": 0.96,
"corporation": {
"city": "港区",
"name": "国立印刷局",
"status": "active",
"street": "虎ノ門二丁目2番5号",
"name_en": null,
"corp_kind": "101",
"name_kana": null,
"address_en": null,
"close_date": null,
"prefecture": "東京都",
"change_date": "2015-10-05",
"close_cause": null,
"postal_code": "1058445",
"update_date": "2018-04-02",
"address_full": "東京都港区虎ノ門二丁目2番5号",
"process_kind": "01",
"assignment_date": "2015-10-05",
"corp_kind_label": "National government agency",
"prefecture_code": "13",
"corporate_number": "7000012050002",
"close_cause_label": null,
"successor_corporate_number": null
}
},
"verified": true,
"candidates": [
{
"matched": {
"city": true,
"name": true,
"name_exact": true,
"prefecture": true
},
"confidence": 0.96,
"corporation": {
"city": "港区",
"name": "国立印刷局",
"status": "active",
"street": "虎ノ門二丁目2番5号",
"name_en": null,
"corp_kind": "101",
"name_kana": null,
"address_en": null,
"close_date": null,
"prefecture": "東京都",
"change_date": "2015-10-05",
"close_cause": null,
"postal_code": "1058445",
"update_date": "2018-04-02",
"address_full": "東京都港区虎ノ門二丁目2番5号",
"process_kind": "01",
"assignment_date": "2015-10-05",
"corp_kind_label": "National government agency",
"prefecture_code": "13",
"corporate_number": "7000012050002",
"close_cause_label": null,
"successor_corporate_number": null
}
}
]
}
}Tags
x402
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