Ask Japan

Japanese public business data for AI agents: search 5.8M registered corporations, company profile by corporate number, qualified invoice issuer check, EDINET filers by industry, postcode and address lookup. Plus MARU Japan Hands: real people in Japan who make Japanese phone calls, restaurant and golf reservations, interpreting and in-store purchases. Remote Streamable HTTP endpoint, no API key: https://askjapan.senpinai.com/mcp

GitHub

Hosted MCP Server

npx add-mcp 'https://askjapan.senpinai.com/mcp'

Installs into Claude Code, Codex, Cursor and more

Documentation

Ask Japan — MCP server for Japan

Japanese company, invoice and postcode data, plus real people in Japan who make phone calls, reservations and errands for your AI agent.

MCP endpoint (Streamable HTTP, no API key): https://askjapan.senpinai.com/mcp
Website: https://askjapan.senpinai.com/
Official MCP Registry: com.senpinai/ask-japan
Operator: iHouse Co., Ltd. (iHouse株式会社), Osaka, Japan — corporate number 3120001180173
Privacy policy: https://askjapan.senpinai.com/privacy

This repository holds documentation only. The server is hosted; there is nothing to install.

Connect

Claude (claude.ai / Claude Desktop): Settings → Connectors → Add custom connector → paste https://askjapan.senpinai.com/mcp.

ChatGPT (developer mode), Cursor, Cline, VS Code, any MCP client:

{
  "mcpServers": {
    "ask-japan": {
      "type": "streamable-http",
      "url": "https://askjapan.senpinai.com/mcp"
    }
  }
}

Clients that only speak stdio can use npx mcp-remote https://askjapan.senpinai.com/mcp.

Tools

Japanese public data (free, read-only)

Tool	What it does
`search_company`	Search all ~5.8 million corporations registered in Japan by name (partial match, Japanese).
`get_company_profile`	Profile from a 13-digit corporate number: registered name, address, status, invoice registration.
`check_invoice`	Check whether a company is a registered Qualified Invoice Issuer (T-number).
`search_listed_companies`	Filter companies that file securities reports (EDINET) by industry.
`lookup_postcode`	Address for a 7-digit Japanese postcode, including large-office postcodes.
`search_address`	Find postcodes from part of an address or an office name.

Sources: National Tax Agency corporate number and invoice publication data, Japan Post postcode data, FSA EDINET code list. Synced daily.

People in Japan (MARU Japan Hands, paid)

Tool	What it does
`list_services`	Services and prices: Japanese phone calls (¥1,500), restaurant and golf reservations (¥3,000), interpreting, in-store purchase and shipping, on-site photo checks, queue and pickup.
`check_availability`	Whether a new request can be taken now (JST 9:00–21:00).
`request_service`	Send a task. Fixed-price tasks are quoted immediately; others get a fixed quote within 2 hours.
`get_request_status`	Status, quote, payment and result (confirmation numbers, photos, receipts).
`quote_purchase`	Instant cost estimate to buy an item in Japan and ship it.
`get_menu`, `check_open`, `place_takeout_order`	Takeout from participating restaurants.

Payment: JPYC, USDC or USDT (Kaia or Polygon); credit card coming soon. Full refund if the task cannot be done or is cancelled before work starts. Terms and seller details: https://hands.senpinai.com/legal

Example prompts

"Is 株式会社〇〇 a registered invoice issuer? Give me its corporate number and address."
"Find the postcode for 大阪市北区梅田."
"Call this restaurant in Osaka and book a table for 4 on Friday at 19:00."
"How much would it cost to buy this item in Japan and ship it to Taiwan?"

Contact

info@senpinai.com · https://hands.senpinai.com/contact