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kaisha-mcp

by vladic-corp
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kaisha-mcp

MCP server for the Kaisha API — official Japanese company-registry data for AI agents, paid per call with x402 (USDC on Base or Solana). No API keys, no signup — the paying wallet is the account.

Data comes from Japan's National Tax Agency open datasets: all ~5.8M registered corporations (法人番号) and ~5M qualified-invoice registrations (適格請求書). Individual proprietors' names are never returned.

Install

Add it to any MCP client (Claude Code, Cursor, OpenClaw, …) in one line:

claude mcp add kaisha -e EVM_PRIVATE_KEY=0x<base-wallet-with-usdc> -- npx -y kaisha-mcp

Or run it directly:

EVM_PRIVATE_KEY=0x... npx -y kaisha-mcp

Related MCP server: jp-m2m-mcp

Configuration

Set at least one signing key — a wallet holding a small amount of USDC (calls cost $0.002–$0.01):

Env var

Meaning

EVM_PRIVATE_KEY

Base wallet private key holding USDC (0x…)

SVM_PRIVATE_KEY

Solana wallet private key holding USDC (base58)

EVM_RPC_URL

(optional) Base RPC, default https://mainnet.base.org

KAISHA_BASE_URL

(optional) API base, default https://kaisha-api.hp-vladic.workers.dev

Keep your private key in your MCP client's env config — never commit it.

Tools

Tool

Description

Price

resolve_japanese_company

Company name (fuzzy) or 13-digit corporate number → canonical name, address, entity type, active/closed

$0.005

verify_japan_invoice_number

Qualified-invoice number (T+13 digits) → active / cancelled / not-found, registration date, name

$0.01

japan_new_companies

Daily feed of newly registered companies (新設法人), closures, moves, renames, mergers from NTA diff data

$0.01

japan_business_days

Business-day check / add N days / count a range (weekends + national holidays)

$0.002

japan_holidays

Japanese national holidays for a year (1955–2027)

$0.002

kaisha_catalog

Machine-readable catalog of endpoints, prices, and payment networks

free

How payment works

Each priced call triggers the x402 flow automatically: the API replies 402 Payment Required with a price, your wallet signs a USDC payment, the request is retried, and the data comes back with an on-chain settlement proof. Every challenge offers both Base (eip155:8453) and Solana mainnet.

Links

License

MIT

This server cannot be installed

A
license - permissive license
-
quality - not tested
C
maintenance

How are these scores calculated?

Maintenance

–Maintainers
–Response time
–Release cycle
–Releases (12mo)
Commit activity

Resources

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Looking for Admin?

If you are the server author, to access and configure the admin panel.

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