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mcp/harbor
Claude Desktop

PayStage Preflight for Claude Desktop

io.github.base-buzz/preflight

Evaluate x402 PaymentRequired against a local spending policy before an agent pays

client:Claude Desktop transport:stdio runtime:npm

Install PayStage Preflight in Claude Desktop

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

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{
  "mcpServers": {
    "preflight": {
      "command": "npx",
      "args": [
        "-y",
        "@paystage/preflight"
      ],
      "env": {
        "PAYSTAGE_POLICY_PATH": "<PAYSTAGE_POLICY_PATH>"
      }
    }
  }
}

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

PayStage Preflight in other clients

PayStage Preflight MCP server