Korea Business Verify (KBV) MCP server

Korea Business Verify (KBV) — MCP Server

KBV is a hosted MCP server that verifies Korean businesses in real time — 10 free calls/day, then pay-per-call (x402). Give it a 10-digit Korean business registration number (사업자등록번호) and it returns the registration status (active / suspended / closed), tax type, and — optionally — whether the number matches a representative name and opening date. Data comes live from the Korea National Tax Service (NTS) and is returned as clean, English-normalized JSON.

No account, no API key, no installation — connect any MCP-capable agent to one URL:

https://kbv-server-f7vfitmlkq-du.a.run.app/mcp

Built for AI agents and developers doing KYB / due-diligence on Korean companies: procurement, contracting, payments, marketplace onboarding.

Quick facts

Connect your agent

Claude (claude.ai)

1. Settings → Connectors → Add custom connector
2. URL: https://kbv-server-f7vfitmlkq-du.a.run.app/mcp
3. Enable the connector in a chat and ask: "Check the status of Korean business 124-81-00998."

Claude Code (CLI)

claude mcp add --transport http kbv https://kbv-server-f7vfitmlkq-du.a.run.app/mcp

ChatGPT

1. Settings → Connectors (requires a plan with connector / developer-mode support)
2. Add a custom MCP connector with URL https://kbv-server-f7vfitmlkq-du.a.run.app/mcp
3. Enable it in a conversation and ask about a Korean business number.

Cursor

Add to .cursor/mcp.json (project) or ~/.cursor/mcp.json (global):

{
  "mcpServers": {
    "korea-business-verify": {
      "url": "https://kbv-server-f7vfitmlkq-du.a.run.app/mcp"
    }
  }
}

Any other MCP client

Use transport Streamable HTTP with the endpoint above. Clients must send Accept: application/json, text/event-stream (standard MCP clients do this automatically). Opening /mcp in a browser returns Method not allowed by design — browsers send GET, MCP uses POST. Use /health for a visual liveness check.

Tools

checkkoreanbusiness_status

Check the registration status of a Korean business by its 10-digit business registration number.

Input — hyphens/spaces allowed; normalized internally:

{ "business_number": "124-81-00998" }

Output (real example — Samsung Electronics):

{
  "business_number": "1248100998",
  "status": "active",
  "status_code_raw": "01",
  "tax_type": "general",
  "closed_date": null,
  "checked_at": "2026-08-24T10:08:20.082Z",
  "source": "Korea National Tax Service (NTS)",
  "cache": false
}

Field reference:

Shortened. The full README is on GitHub.