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

🛠️ Key Features

Tool count: 6
Validates company existence against government open data
Verifies invoice-issuer registrations
Checks registered addresses for accuracy
Lightweight server for compliance checks
Open data-driven verification

🚀 Use Cases

Compliance auditing for Japanese suppliers
Due diligence for B2B partnerships
Verification of invoice issuer credentials
Address validation for corporate records
Regulatory reporting with government-backed data
Integrations into procurement workflows

⚡ Developer Benefits

Clear data sourcing from government open data
Focused on corporate verification workflows
Simple integration surface for compliance checks
Grounded in real-world corporate verification tasks
Minimal dependency surface with 6 tools

⚠️ Limitations

Dependent on availability of government open data
May require up-to-date data refreshes for accuracy
Limited to defined verification domains (companies, registrations, addresses)

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。

Parameters6

op	string	required	操作種別
date	string	optional	基準日 YYYY-MM-DD（list_holidays以外で必須）
days	integer	optional	加算する営業日数（add_business_daysで必須。負数=遡り、0=基準日をそのまま返す）
from	string	optional	期間開始日（list_holidaysで必須）
to	string	optional	期間終了日（list_holidaysで必須）
year_end_as_holiday	boolean	optional	12/29〜1/3を非営業日として扱う（官公庁・銀行休業の慣行。既定false=祝日法と土日のみ）

Raw schema

{
  "type": "object",
  "properties": {
    "op": {
      "type": "string",
      "enum": [
        "is_business_day",
        "next_business_day",
        "prev_business_day",
        "add_business_days",
        "list_holidays"
      ],
      "description": "操作種別"
    },
    "date": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "基準日 YYYY-MM-DD（list_holidays以外で必須）"
    },
    "days": {
      "type": "integer",
      "minimum": -1000,
      "maximum": 1000,
      "description": "加算する営業日数（add_business_daysで必須。負数=遡り、0=基準日をそのまま返す）"
    },
    "from": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "期間開始日（list_holidaysで必須）"
    },
    "to": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "期間終了日（list_holidaysで必須）"
    },
    "year_end_as_holiday": {
      "type": "boolean",
      "default": false,
      "description": "12/29〜1/3を非営業日として扱う（官公庁・銀行休業の慣行。既定false=祝日法と土日のみ）"
    }
  },
  "required": [
    "op"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

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

🛠️ Key Features

🚀 Use Cases

⚡ Developer Benefits

⚠️ Limitations

resolve_company

verify_company

verify_invoice_number

get_company_profile

normalize_address

jp_calendar

Install

Remote endpoint

name	string	required	法人名（(株)等の略記・全半角・かな/カナ・旧字体の表記ゆれ可）
address	string	optional	所在地で絞り込み: 都道府県コード2桁（JIS X 0401）または+市区町村コード3桁の計5桁
include_closed	boolean	optional	閉鎖法人を候補に含める（既定true）
limit	integer	optional	返却する候補数の上限（既定10）

corporate_number	string	required	法人番号13桁（全角・ハイフン・空白は吸収）
include_history	boolean	optional	商号変更等の履歴を含める（既定false）

registration_number	string	required	適格請求書発行事業者登録番号（T+13桁。Tなし13桁・全角・ハイフン空白は吸収）
on_date	string	optional	基準日 YYYY-MM-DD（指定時はその日時点で登録が有効だったかを as_of で返す）
include_history	boolean	optional	公表履歴（新規登録・変更・取消・失効）を含める（既定false）