0xcircuitbreaker

Live DDG Agent Services catalog over remote MCP: 54 tools for discovering and calling 376 pay-per-call x402 routes (USDC on Base), quoting payment challenges, and checking service status. No account or API key required.

Five free guardrail skills for agents that touch money, audits, or outbound messaging: fleet audit starter, UNKNOWN-is-not-pass, agent price-parity check, cron outreach safety gate, and x402 facilitator health check.