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Pre-signature x402 payment verdict (GO/HOLD/STOP) for AI agents, with a verifiable signed receipt.
npx @getmcp/cli add com.blackwalltier/blackwall-x402-guardrailRequires Node.js 18+. Community-contributed server. Review source before installing.
Config file: ~/Library/Application Support/Claude/claude_desktop_config.json
{
"mcpServers": {
"com.blackwalltier/blackwall-x402-guardrail": {
"url": "https://mcp.blackwalltier.com",
"transport": "streamable-http"
}
}
}