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mcp/harbor
Claude Desktop

usps mcp for Claude Desktop

io.github.mrfentmen/usps-mcp

USPS shipping, tracking, address validation, and label creation.

client:Claude Desktop transport:stdio runtime:npm

Install usps mcp in Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json · windows: %APPDATA%\Claude\claude_desktop_config.json

Held in this page only — never stored, logged, or sent anywhere but back to your screen. 

{
  "mcpServers": {
    "usps-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "usps-mcp"
      ],
      "env": {
        "USPS_API_KEY": "<USPS_API_KEY>",
        "USPS_USERNAME": "<USPS_USERNAME>",
        "USPS_PASSWORD": "<USPS_PASSWORD>",
        "USPS_API_URL": "<USPS_API_URL>"
      }
    }
  }
}

Settings → Developer → Edit Config opens this file. Restart the app after saving. Claude Desktop docs

usps mcp in other clients

usps mcp MCP server