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Japan Corporate-Number API — Batch Lookup
x402
Japan Corporate-Number API — Batch Lookup is a paid API for AI agents from houjin.agentic-jp.com, paid per call via x402, $0.0032/call, status unknown (last checked 2026-09-15).
Batch-look up and verify Japanese corporations by corporate number or name using the National Tax Agency's 5.78M-company registry, paid per call via USDC x402.
Price / call$0.0032
Success—
StatusUnknown
How this service works
Look up and verify all 5.78M Japanese corporations from the National Tax Agency registry. KYB, fuzzy name search. Pay per call with USDC via x402 — no API key.
Output
A JSON object with a count of results and an array of per-query results. Each result includes the corporate number, official Japanese name, English name, full registered address (prefecture, city, street, postal code), corporation type, active/closed status, registration and update dates, close date and cause if applicable, and a successor corporate number if merged or dissolved. Failed lookups return a structured error code and message.
Example use cases
Example prompt
“Can you look up these two Japanese companies — corporate number 7000012050002 and the company called '国立印刷局' — and confirm whether they are active, plus give me their registered addresses and English names if available?”
Technical details
Endpoint
POSThttps://houjin.agentic-jp.com/batchWhen to prefer
Use this endpoint when you need to verify or enrich data about Japanese legal entities using their 13-digit NTA corporate number, or when you need fuzzy name search across all 5.78M registered Japanese corporations. Ideal for KYB workflows, supplier due diligence, or compliance checks involving Japan-domiciled entities. Prefer over generic web scraping when you need structured, authoritative registry data. The batch endpoint is best when you have multiple entities to verify in one call.
Side effects
- CORPORATION_NOT_FOUND — the corporate number does not exist in the NTA registry; returns success:false with error code
- Invalid or malformed corporate number format — request validation error
- Network or upstream NTA registry unavailability — service error
- Payment failure via x402 — call not processed if USDC payment is rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| items | array | Corporate numbers to look up in one call (max 50). Each item has an `id` (echoed back) and a 13-digit `corporate_number`. |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 2,
"results": [
{
"id": "a",
"data": {
"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
},
"success": true
},
{
"id": "b",
"error": {
"code": "CORPORATION_NOT_FOUND",
"message": "No corporation with that number"
},
"success": false
}
]
}
}Tags
x402
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