Agent Verification API

{
  "name": "Agent Verification API",
  "description": "Confirms an AI agent/service is who it claims to be: cross-signal domain verification fused with a real agent-card fetch and a real MCP handshake.",
  "url": "https://agent-verification-api-325572559480.us-central1.run.app",
  "version": "1.0.0",
  "documentationUrl": "https://agent-verification-api-325572559480.us-central1.run.app/docs",
  "provider": {
    "organization": "nexus-mcp-infra",
    "url": "https://github.com/nexus-mcp-infra"
  },
  "capabilities": {
    "streaming": false,
    "pushNotifications": false,
    "stateTransitionHistory": false
  },
  "defaultInputModes": [
    "application/json"
  ],
  "defaultOutputModes": [
    "application/json"
  ],
  "additionalInterfaces": [
    {
      "url": "https://agent-verification-api-325572559480.us-central1.run.app/mcp",
      "transport": "MCP"
    }
  ],
  "skills": [
    {
      "id": "nexus_agent_verification_api_verify_agent_identity",
      "name": "Verify Agent Identity",
      "description": "Confirm an AI agent/service is who it claims to be, fusing domain existence verification with agent-card and MCP-handshake evidence.",
      "tags": [
        "agent-identity",
        "verification",
        "anti-hallucination",
        "trust"
      ]
    }
  ],
  "metadata": {
    "protocol_note": "This service implements the Model Context Protocol (MCP) at /mcp, not A2A's own task methods. POST /verify-agent-identity is charged $0.35 via x402 (Base Sepolia TESTNET, not real funds) -- higher than a simple metadata-extraction call because each request does real paid WHOIS spend plus 5-6 real outbound checks (WHOIS, Certificate Transparency, Wayback Machine, DNS, agent-card fetch, MCP handshake), not one. The MCP tool is currently free -- see README. Payment settles BEFORE verification runs, at the ASGI middleware layer ahead of request validation: a call is charged even if it returns a non-VERIFIED verdict, and even if it 400s (invalid domain / agent_endpoint_url rejected by the SSRF guard) or 422s (malformed body)."
  }
}