Card snapshot

This is a frozen copy of the agent's agent-card.json as we observed it at the timestamp above. We capture a new snapshot every time the card's content hash changes. Useful for: forensic drift analysis, verifying downstream callers see the right version, reproducing routing decisions made historically.

{
  "protocolVersion": "0.3.0",
  "name": "x402check",
  "description": "Call before paying any x402 tool. Trust-check the seller URL: is it reachable, is the 402 legit, what payTo/price does it demand, and has payTo or price drifted. Returns ok|caution|avoid + that tool's history only. Budget guard and compare helpers for agents. Paid per URL. Not a wallet OFAC/drainer scanner.",
  "url": "https://x402check.dev/preflight",
  "preferredTransport": "HTTP+JSON",
  "version": "0.2.2",
  "documentationUrl": "https://x402check.dev/docs",
  "iconUrl": "https://x402check.dev/assets/icon.svg",
  "provider": {
    "organization": "x402check",
    "url": "https://x402check.dev"
  },
  "capabilities": {
    "streaming": false,
    "pushNotifications": false,
    "stateTransitionHistory": false
  },
  "defaultInputModes": [
    "application/json",
    "text/plain"
  ],
  "defaultOutputModes": [
    "application/json"
  ],
  "supportedInterfaces": [
    {
      "url": "https://x402check.dev/preflight",
      "protocolBinding": "https://x402.org/http+json",
      "protocolVersion": "2"
    },
    {
      "url": "https://x402check.dev/mcp",
      "protocolBinding": "https://modelcontextprotocol.io/streamable-http",
      "protocolVersion": "2025-03-26"
    }
  ],
  "skills": [
    {
      "id": "preflight_one",
      "name": "Preflight one x402 tool",
      "description": "Trust-check one absolute https x402 seller URL before you pay it. Use for: is this endpoint safe/legit; verify payTo; detect price or wallet drift; check uptime; validate 402 payment requirements; budget guard before signing USDC on Base; debug a failing 402.",
      "tags": [
        "x402",
        "trust",
        "preflight",
        "safety",
        "payTo",
        "verify",
        "uptime",
        "scam-check",
        "budget-guard"
      ],
      "examples": [
        "GET https://x402check.dev/preflight?url=https://seller.example/api (pay $0.002 first)",
        "Is https://seller.example/x402 safe to pay?",
        "Verify payTo for this x402 tool before settle",
        "Has this seller changed price or wallet?",
        "Is this x402 endpoint down?"
      ],
      "inputModes": [
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    },
    {
      "id": "verify_payto",
      "name": "Verify x402 payTo",
      "description": "Extract and verify the receiving wallet (payTo) from a seller's live 402 challenge, with history of wallet rotations. Use before signing a USDC transfer.",
      "tags": [
        "x402",
        "payTo",
        "verify",
        "wallet",
        "Base",
        "USDC"
      ],
      "examples": [
        "What payTo address does this x402 tool demand?",
        "Compare payTo to my allowlist before settle"
      ],
      "inputModes": [
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    },
    {
      "id": "preflight_batch",
      "name": "Compare / batch preflight x402 tools",
      "description": "Trust-check up to 25 seller URLs in one request. Charged per URL (N \u00d7 unit) in a single Exact settlement. Use when comparing candidates, picking cheapest/most reliable, or screening Bazaar hits before paying.",
      "tags": [
        "x402",
        "trust",
        "batch",
        "compare",
        "cheapest",
        "reliable"
      ],
      "examples": [
        "POST https://x402check.dev/preflight {\"urls\":[\"https://a.example\",\"https://b.example\"]}",
        "Which of these paid APIs is safest and cheapest?"
      ],
      "inputModes": [
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    }
  ],
  "securitySchemes": {
    "x402": {
      "type": "apiKey",
      "in": "header",
      "name": "PAYMENT-SIGNATURE",
      "description": "x402 Exact payment proof after 402 PAYMENT-REQUIRED challenge"
    }
  },
  "security": [
    {
      "x402": []
    }
  ]
}