Clerkfield

Clerkfield MCP server

Verify U.S. businesses against official state registries and search UCC liens, from Claude, Cursor, VS Code, Windsurf and any other Model Context Protocol client.

Clerkfield reads each state's own business registry and UCC filing office, not a resold database, and returns every result with its official source and the date of the data. It's built for merchant cash advance funders, lenders and anyone doing KYB on U.S. businesses.

Tools

Tool	What it does
verify_business	Checks a business against the registry of the state it was formed in. Returns pass, review or fail with flags explaining why (name match, active status, months in business, whether the owner is listed) and the state's record: legal name, entity id, status, formation date, addresses, registered agent and officers.
search_liens	Lists UCC financing statements filed against a business (debtor) or by a lender (secured party), newest first, with a summary of active, lapsed and terminated filings and the lenders on active filings. Each filing has its file number, dates, parties, collateral and later amendments.
get_coverage	Which states each check covers today. Tool descriptions are built from it at start-up, so they always list the states covered right now.

All tools are read-only.

Get an API key

Create a free account at clerkfield.com/app, open your profile and create an API key. Clerkfield is free during the beta.

Option 1: remote server (no install)

Point your client at https://clerkfield.com/mcp (Streamable HTTP) with the header Authorization: Bearer <your key>.

Claude Code

claude mcp add --transport http clerkfield https://clerkfield.com/mcp --header "Authorization: Bearer YOUR_KEY"

Cursor / VS Code / Windsurf (mcp.json)

{
  "mcpServers": {
    "clerkfield": {
      "url": "https://clerkfield.com/mcp",
      "headers": { "Authorization": "Bearer YOUR_KEY" }
    }
  }
}

Option 2: local server (npm)

Runs on your machine and calls the Clerkfield API. Needs Node.js 18.17 or later.

Claude Desktop (claude_desktop_config.json), Cursor, VS Code, Windsurf

{
  "mcpServers": {
    "clerkfield": {
      "command": "npx",
      "args": ["-y", "clerkfield-mcp"],
      "env": { "CLERKFIELD_API_KEY": "YOUR_KEY" }
    }
  }
}

Claude Code

claude mcp add clerkfield --env CLERKFIELD_API_KEY=YOUR_KEY -- npx -y clerkfield-mcp

Docker

docker build -t clerkfield-mcp .
docker run -i --rm -e CLERKFIELD_API_KEY=YOUR_KEY clerkfield-mcp

Variable	Required	Meaning
CLERKFIELD_API_KEY	Yes	Your Clerkfield API key
CLERKFIELD_BASE_URL	No	API base URL (default https://clerkfield.com)

Example prompts

• "Verify Joes Pizza Italia Inc in New York and tell me how long it's been in business."
• "Is Jane Doe listed as an officer of Acme Roofing LLC in Florida?"
• "Show every active UCC lien on Harbor Street Bakery LLC in Connecticut, newest first."
• "Which states can you search UCC liens by lender in?"

Good to know

• Coverage varies by state and grows over time: ask get_coverage, or see clerkfield.com/coverage.
• When a state doesn't publish a field for free, the result says "not published" instead of leaving it blank. When a state's records can't be reached, the tool returns an error, never stale or guessed data.
• Clerkfield reports on businesses only and is not a consumer reporting agency. Don't use results to decide an individual's eligibility for credit, employment, housing or insurance (terms).
• Each verify_business and search_liens call counts as one request on your account.

Links

• API documentation: clerkfield.com/docs · OpenAPI: clerkfield.com/openapi.json
• Support: [email protected]

License

MIT © Bramonti Ventures LLC. This repository contains only the MCP client for the Clerkfield API.