Install Genesis402 by UnyKorn (x402 pay-per-call) for Claude Desktop

Claude Desktop reads mcpServers from claude_desktop_config.json. Restart the app after saving.

Open ~/Library/Application Support/Claude/claude_desktop_config.json on macOS, %APPDATA%\Claude\claude_desktop_config.json on Windows, or ~/.config/Claude/claude_desktop_config.json on Linux.
Paste the JSON config below.
Replace placeholder secrets, then restart the client if it does not reload on its own.

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "fthtrading-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "genesis402-mcp@0.3.10"
      ],
      "env": {
        "GENESIS402_LIVE": "0",
        "GENESIS402_PAYER_KEY": "YOUR_GENESIS402_PAYER_KEY",
        "GENESIS402_MAX_USD": "0.25"
      }
    }
  }
}

Official Claude Desktop docs