HojinCheck — Japanese corporate verification API (hojin = 法人/corporate entity)

Name: HojinCheck — Japanese corporate verification API (hojin = 法人/corporate entity)
Author: hojincheck

Verify Japanese companies, invoice-issuer registrations and addresses against government open data.

CommunityOnlineAPI key requiredGlobalFreeRead-only

What it can do

What data it sees

Do you need an account

An API key from the service settings is required

Verify Japanese companies, invoice-issuer registrations and addresses against government open data.

How to connect

How to connect HojinCheck — Japanese corporate verification API (hojin = 法人/corporate entity) to Claude

The server address to paste into Claude settings:

https://hojincheck.com/mcp

Open Claude (claude.ai or the desktop app).
Go to Settings → Connectors.
Click Add custom connector.
Paste the server address copied below into Remote MCP server URL and click Add.
In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect HojinCheck — Japanese corporate verification API (hojin = 法人/corporate entity) to ChatGPT

The server address to paste into ChatGPT settings:

https://hojincheck.com/mcp

Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
Open Settings → Connectors and click Create.
Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect HojinCheck — Japanese corporate verification API (hojin = 法人/corporate entity) to Cursor

The server address to paste into Cursor settings:

https://hojincheck.com/mcp

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (6)

Raw names from tools/list. Only developers need these.

resolve_company	法人名（表記ゆれ・かな/カナ対応）から法人番号の候補と確度（0〜1＋根拠ラベル）を返します。データ源: 国税庁法人番号システムWeb-API。
verify_company	法人番号（13桁・チェックディジット検証つき）から実在・商号・本店所在地・法人種別・閉鎖ステータスを返します。include_history=trueで商号変更等の履歴も返します。データ源: 国税庁法人番号システムWeb-API。
verify_invoice_number	適格請求書発行事業者の登録番号（T+13桁）から登録有無・登録年月日・取消/失効を返します。on_dateで基準日時点の有効性判定、include_history=trueで公表履歴も返します。入力は登録番号のみ（氏名等による検索は提供しません）。データ源: 国税庁適格請求書発行事業者公表システムWeb-API。
get_company_profile	法人番号（13桁・チェックディジット検証つき）からgBizINFOの法人プロファイル（所在地・代表者・資本金・従業員数等）を、項目別の出典・最終取得日メタとあわせて返します。データ源: Gビズインフォ REST API v2（経済産業省）。
normalize_address	日本の住所を正規化し、都道府県／市区町村／町字（大字・町名＋丁目）に分解して町字ID（アドレス・ベース・レジストリ）を解決し、郵便番号と照合します（不一致は不一致として明示）。【v1の粒度と限界】分解は町字（大字・丁目）まで。街区符号・住居番号・地番・小字・京都の通り名は解析対象外で、未解析部分は残余文字列としてそのまま返します（推測補完なし）。データ源: アドレス・ベース・レジストリ町字マスター（デジタル庁）＋日本郵便郵便番号データ（ローカルマスター駆動・政府API停止の影響なし）。
jp_calendar	日本の祝日判定と営業日計算（内閣府「国民の祝日」CSV準拠）。営業日=土日・祝日以外。year_end_as_holiday=trueで12/29〜1/3も非営業日扱い。