# Japan Company Enrichment by Houjin Number (kasanegi.com)

> Japan Company Enrichment by Houjin Number (kasanegi.com) is a paid API for AI agents from api.kasanegi.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Looks up and enriches Japanese company data using a houjin (corporate registration) number, returning structured public-data details about the company.

## Facts

- Endpoint: GET https://api.kasanegi.com/v1/enrich/company-by-houjin-number
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/japan-company-enrichment-by-houjin-number-kasanegi-com-b9481232
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WVMikhtlYDKxGDBJn2qX-

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability japan-company-enrichment-by-houjin-number-kasanegi-com-b9481232
```

Example prompt: Can you look up the official company details for the Japanese firm 'Toyota Motor Corporation' — search by company name and filter to Aichi prefecture, returning up to 5 candidates with verbose info?

## When to prefer this

Use this endpoint when you need clean, structured Japanese corporate registration data without scraping government sites. Ideal when you have a company name (Japanese or romaji) and optionally a prefecture, and need to resolve it to an official houjin number and enriched company profile. Prefer this over manual scraping of the NTA registry or similar sources when building automated Japan-focused business intelligence, due diligence, or KYC workflows.

## Known failure modes

- Company name not found in the houjin registry — returns empty results or 404
- Invalid or malformed houjin number — returns 400 validation error
- Prefecture filter too narrow — returns zero candidates
- Limit parameter out of range (below 1 or above 50) — returns 422 validation error
- Rate limit or payment failure (x402 payment not attached) — returns 402 Payment Required
- Japanese government data source temporarily unavailable — returns 503

## How this service works

Stop scraping Japanese government and public-data sites. Call clean Japan payroll, company, and grant APIs over one host. Preview free; one public marketplace listing covers all current products; x402 direct is available for agent-native buyers.

## Output

Returns structured JSON with enriched company details sourced from the Japanese houjin public registry, including corporate name (Japanese/romaji), houjin number, registered address, prefecture, and other available public registration metadata for matching companies.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "mimeType": "application/json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/japan-company-enrichment-by-houjin-number-kasanegi-com-b9481232/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.kasanegi.com](https://www.zero.xyz/host/api.kasanegi.com/llms.txt)