{
  "tool_id": "art-19-agentic-checkout-protocol-selector",
  "note": "golden_hash is empty until first `node golden-parity.test.mjs --update`.",
  "vectors": [
    {
      "name": "minimal",
      "policy_parameters": {
        "platform": "custom",
        "buyer_type": "agent",
        "aov": "mid",
        "agent_appetite": "high",
        "geo": "global",
        "tech_cap": "api",
        "stack_card": false,
        "stack_crypto": false
      },
      "output_payload": {
        "primary_recommendation": "ACP",
        "primary_name": "ACP (Agent Commerce Protocol / AP2)",
        "primary_score": 100,
        "protocol_scores": [
          {
            "protocol": "ACP",
            "name": "ACP (Agent Commerce Protocol / AP2)",
            "score": 100,
            "label": "recommended",
            "bestFor": "AI-native merchants, ChatGPT / Gemini checkout integration, structured mandate flows",
            "notFor": "Merchants with no AI agent traffic or no API integration capability"
          },
          {
            "protocol": "UCP",
            "name": "UCP (Universal Checkout Protocol)",
            "score": 95,
            "label": "recommended",
            "bestFor": "Platform merchants, broad agent interop, standardized checkout across agent surfaces",
            "notFor": "Micropayments < $1, custom API-only merchants needing sub-cent settlement"
          },
          {
            "protocol": "x402",
            "name": "x402 (HTTP 402 Micropayment Protocol)",
            "score": 55,
            "label": "viable",
            "bestFor": "API/content micropayments, per-call AI agent billing, developer tools, sub-$10 transactions",
            "notFor": "Consumer checkout flows, merchants needing fiat settlement, high-AOV merchandise"
          },
          {
            "protocol": "TAP",
            "name": "Visa TAP / VIC (Trusted Agent Protocol)",
            "score": 55,
            "label": "viable",
            "bestFor": "Card-first merchants, backward compat with existing Visa acquiring, high-value B2C/B2B",
            "notFor": "Crypto-native merchants, micropayments, merchants without Visa acquiring"
          }
        ],
        "viable_protocols": [
          "ACP",
          "UCP",
          "x402",
          "TAP"
        ],
        "recommended_protocols": [
          "ACP",
          "UCP"
        ],
        "profile": {
          "platform": "custom",
          "buyer_type": "agent",
          "aov": "mid",
          "agent_appetite": "high",
          "geo": "global",
          "tech_cap": "api",
          "stack_card": false,
          "stack_crypto": false
        }
      },
      "golden_hash": "41a81f93959aac9b99d3581fe444956a8cb9eec29910e49b491e7385e0971a20"
    }
  ]
}