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Kaisha API – Japanese Corporate Number Resolver
x402
Kaisha API – Japanese Corporate Number Resolver is a paid API for AI agents from kaisha-api.hp-vladic.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Resolves a Japanese company name or 13-digit corporate number to its official NTA registry record, including corporate number, canonical name, head-office address, entity type, and active/closed status.
Price / call$0.005
Success—
StatusUnknown
How this service works
Resolve a Japanese company to its official registry record: 13-digit corporate number (法人番号), canonical registered name, head-office address, entity type, and active/closed status. Query by name (fuzzy normalization: legal-form words, zenkaku/hankaku and kana variants are handled) or by corporate number. Source: National Tax Agency corporate number registry, all ~5M registered corporations in Japan.
Output
Returns up to 25 matching registry records from the NTA's ~5M Japanese corporations, each including the 13-digit corporate number (法人番号), canonical registered name, head-office address, legal entity type, and active/closed status. Fuzzy normalization handles zenkaku/hankaku, kana variants, and legal-form suffixes.
Example use cases
Example prompt
“Can you look up the official NTA registry record for トヨタ自動車株式会社 — I need their 13-digit corporate number, registered head-office address, and whether they're currently active?”
Technical details
Endpoint
GEThttps://kaisha-api.hp-vladic.workers.dev/resolveWhen to prefer
Use this endpoint when you need to authoritatively resolve a Japanese company to its official NTA registry identity — corporate number, canonical name, address, and status — especially when you have only a colloquial or partial name and need fuzzy normalization across kana/kanji variants. Prefer over general web search when you need structured, authoritative registry data on any of Japan's ~5M registered corporations.
Side effects
- Company name not found in registry — returns empty results or 404
- Ambiguous name matches too many records — returns up to limit results, may need refinement
- Invalid or non-existent 13-digit corporate number — returns no match
- Non-Japanese company queried — not in NTA registry, no results
- Malformed query parameter — 400 bad request
- Payment not fulfilled — 402 payment required (x402 protocol)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"found": 1,
"query": {
"type": "name",
"value": "トヨタ自動車",
"normalized": "トヨタ自動車",
"prefecture": "愛知県"
},
"results": [
{
"kind": {
"en": "Kabushiki Kaisha (stock company)",
"ja": "株式会社"
},
"name": "トヨタ自動車株式会社",
"status": "active",
"address": {
"city": "豊田市",
"street": "トヨタ町1番地",
"postCode": "4718571",
"prefecture": "愛知県"
},
"closeDate": null,
"lastUpdate": "2026-06-30",
"corporateNumber": "1180301018771"
}
],
"matchType": "exact"
}
}Tags
x402
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