blackwall x402 guardrail for Gemini CLI

com.blackwalltier/blackwall-x402-guardrail

Keyless hosted MCP: pre-signature x402 payment verdict (GO/HOLD/STOP) with a signed receipt.

client:Gemini CLI transport:streamable-http tools:1

Install blackwall x402 guardrail in Gemini CLI

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

{
  "mcpServers": {
    "blackwall-x402-guardrail": {
      "httpUrl": "https://mcp.blackwalltier.com"
    }
  }
}

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