Base Tx Preflight for Gemini CLI

com.madebydevx.preflight/preflight

Simulate a Base tx before signing: revert reason, gas limit, full fee in ETH/USD. Paid x402.

client:Gemini CLI transport:streamable-http tools:2

Install Base Tx Preflight in Gemini CLI

~/.gemini/settings.json · windows: %USERPROFILE%\.gemini\settings.json

{
  "mcpServers": {
    "preflight": {
      "httpUrl": "https://preflight.madebydevx.com/mcp"
    }
  }
}

Gemini expands $VAR and ${VAR} inside env values, so a secret can live in your shell rather than this file. Gemini CLI docs