ListRiver MCP server

Lets Claude and other AI assistants search new and active U.S. businesses from official state business registries through ListRiver: new LLCs, corporations and nonprofits by state, city, county, ZIP, NAICS industry, entity type, formation month, and whether a phone or email is on file.

Ask things like:

• "How many businesses were formed in Miami-Dade in the last 3 months that have a phone number?"
• "Find 20 new construction companies in Harris County, Texas."
• "List new LLCs in ZIP 80202 formed this month, with their registered agents."

Tools

The assistant is told to count first and to ask only for as many businesses as you need.

Setup

1. Get a free API key (500 records a month): listriver.com/Account/ApiSignUp.aspx
2. Install uv (it runs the server with uvx, no other install needed).
3. Add the server to your AI app.

Claude Desktop (Settings > Developer > Edit Config, then restart Claude Desktop):

{
  "mcpServers": {
    "listriver": {
      "command": "uvx",
      "args": ["listriver-mcp"],
      "env": { "LISTRIVER_API_KEY": "lr_key_..." }
    }
  }
}

Claude Code:

claude mcp add listriver -e LISTRIVER_API_KEY=lr_key_... -- uvx listriver-mcp

Other MCP clients: run uvx listriver-mcp (stdio) with LISTRIVER_API_KEY in the environment. Or pip install listriver-mcp and run listriver-mcp.

Notes

• Every business returned counts against your records each time it is returned; repeated or overlapping searches count again. Counting is free.
• Phone, email, NAICS and county are on file for only part of the records, and coverage varies by state.
• The data is for your own business use, not for resale or for credit, insurance, employment or housing decisions (ListRiver API agreement).
• More: API documentation - support@listriver.com

MIT license.