jp-verify-mcp

An MCP server for JP-Verify, the English-first API that verifies Japanese companies: qualified-invoice registration numbers (T-numbers), Corporate Numbers (法人番号), English names and major shareholders.

It is a thin client. Each tool call is one HTTPS request to JP-Verify's public API at https://jp-verify.obolpay.xyz. The package holds no register data and contacts no other site; it downloads nothing from the National Tax Agency or from EDINET.

Tools

All four are read-only. Each answered call (HTTP 200) is one metered lookup on your JP-Verify plan; the batch tool counts one per well-formed number. verify_japanese_company and get_major_shareholders reject a number that fails JP-Verify's own format or check-digit rule locally, without a call; the batch tool sends the list as given and JP-Verify lists such numbers under invalid, free of charge.

Every result has two parts:

• jp_verify_response: JP-Verify's answer exactly as sent, including data_as_of, notes, disclaimers and the attribution strings;
• metadata: the endpoint, the HTTP status, whether an API key or the key-less sandbox was used, the quota headers (limit, remaining, resets_at) and where the data comes from.

HTTP errors (400, 401, 404, 429, 503, 5xx) and network failures come back as tool errors with a one-line explanation. JP-Verify does not charge for 400, 401, 404, 429 or 503 answers.

Install and run

Requires Python 3.10 or later.

uvx jp-verify-mcp                # or: pip install jp-verify-mcp && jp-verify-mcp

From a source checkout: pip install ., then jp-verify-mcp.

stdio (default)

For Claude Desktop, Claude Code (.mcp.json), Cursor and other clients that start a local server:

{
  "mcpServers": {
    "jp-verify": {
      "command": "uvx",
      "args": ["jp-verify-mcp"],
      "env": { "JPVERIFY_API_KEY": "your key (optional)" }
    }
  }
}

Leave out env to use the key-less sandbox.

Streamable HTTP

jp-verify-mcp --transport streamable-http --host 127.0.0.1 --port 8000
# endpoint: http://127.0.0.1:8000/mcp  (stateless, JSON responses)

• A client may send its own key in an X-API-Key header. It is forwarded to JP-Verify for that call only and takes precedence over JPVERIFY_API_KEY.
• A loopback bind gets DNS-rebinding protection automatically. For a public host name pass --allowed-host your.host.name (repeatable).
• On a non-loopback address the server refuses to start while JPVERIFY_API_KEY is set, because every caller without its own key would use it. Pass --allow-shared-key if that is intended.
• The sandbox allowance is per IP address, so key-less callers of a hosted endpoint share the host's allowance.

Configuration

Other options: jp-verify-mcp --help.

Keys and plans

• Without a key, JP-Verify's key-less sandbox answers. It is limited per IP address per day (JP-Verify documents 50 requests a day, as of 2026-10-07) and JP-Verify may change or end it (its Terms, Article 4).
• Paid plans and their prices are published on JP-Verify's legal notice: https://jp-verify.obolpay.xyz/legal. For a key, see https://jp-verify.obolpay.xyz or write to yanagithefirst11@gmail.com.

Data, sources and attribution

• Registration status, Corporate Number and Japanese name and address come from data published by Japan's National Tax Agency (国税庁): 国税庁適格請求書発行事業者公表サイト (qualified invoice issuers) and 国税庁法人番号公表サイト (Corporate Numbers), mirrored and processed by JP-Verify. They are not produced or guaranteed by the National Tax Agency.
• English names: official-en where the company filed an English name with the Corporate Number register; otherwise generated, a machine romanisation that is not authoritative. Most companies have not filed one.
• Sole proprietors: number, status and dates only. No name or address is returned.
• Major shareholders: the 「大株主の状況」 tables companies file on the FSA's EDINET, extracted by JP-Verify. Organisations are named; every other holder, including every individual, is reported without a name, normally as an aggregate (always on the sandbox). Only companies that file a 有価証券報告書 or 半期報告書 publish this table; for any other company JP-Verify returns no_public_disclosure, a statement of why nothing is published (not a claim that the company has no shareholders). Some filers may show not_yet_available while JP-Verify's ingest catches up. JP-Verify switches this route on separately (its /health reports major_shareholders.enabled); until then the tool answers route_not_enabled.
• JP-Verify may add the FSA's EDINET code list (PDL1.0) and GLEIF LEI data (CC0 1.0) to a result.
• When you republish data from a response, keep its attribution strings and *_register blocks (JP-Verify Terms, Article 5).
• These are register facts as of the dates each response states. They are not tax, legal, investment or ownership advice. JP-Verify answers 503 rather than serve data older than its freshness window.

Privacy

The server sends JP-Verify only what a tool is asked about (numbers, a name, a date) and the API key, if any. It stores nothing, keeps no cache, never retries a call and adds no logging of its own; at the default log level (WARNING) request contents are not logged. JP-Verify's privacy statement: https://jp-verify.obolpay.xyz/v1/privacy. Terms: https://jp-verify.obolpay.xyz/terms.

Development

python3 -m venv .venv && .venv/bin/pip install -e '.[test]'
.venv/bin/python -m pytest

The tests never reach JP-Verify: HTTP is mocked, or answered by a stand-in on 127.0.0.1.

Company and contact

Yanagi the First Co., Ltd. (株式会社ヤナギtheファースト) · yanagithefirst11@gmail.com · https://jp-verify.obolpay.xyz

License

MIT, for this client. Use of the JP-Verify service is governed by its Terms of Service.

Registry

Official MCP Registry name: xyz.obolpay/jp-verify. Source: https://github.com/Hiroshi-Ichiyanagi/jp-verify-mcp