nsgoods Workbench MCP. Endpoint: https://mcp.nsgoods.org/mcp (Streamable HTTP). Free tools: payability_verdict, host_summary, x401_status, drift_status, verify_signature, reports. Add as a custom connector in Claude: Settings > Connectors > Add custom connector > paste the endpoint URL. Rate limit 10 tool calls per IP per day. https://x402.nsgoods.org