evidence crosscheck derived

{
  "input": {
    "body": {
      "target_url": "https://api.example.com/v1/resource"
    },
    "type": "http",
    "method": "POST",
    "bodyType": "json"
  },
  "output": {
    "type": "json",
    "example": {
      "target": "https://api.example.com/v1/resource",
      "receipt": {
        "alg": "Ed25519",
        "key_id": "k1",
        "signature": "..."
      },
      "summary": {
        "status": "WARN",
        "actionable": 1,
        "differences": 1,
        "expected_behavior": 0
      },
      "declared": {
        "amount": "10000",
        "method": "GET",
        "pay_to": "0xabc...",
        "source": "bazaar",
        "network": "eip155:8453"
      },
      "observed": {
        "price": {
          "value": "10000",
          "source": "live_402_header",
          "confidence": "HIGH",
          "observed_at": "2026-08-10T14:03:11+00:00",
          "observations": 3,
          "evidence_hash": "sha256:7b21..."
        },
        "payable": {
          "value": "LIVE_PAYABLE",
          "source": "live_probe",
          "confidence": "HIGH",
          "observed_at": "2026-08-10T14:03:11+00:00",
          "observations": 3,
          "evidence_hash": "sha256:1f0c..."
        }
      },
      "surfaces": {
        "bazaar": {
          "present": true
        },
        "openapi": {
          "present": false
        },
        "live_402": {
          "probed": true,
          "post_policy": null,
          "observations": 3,
          "probed_method": "GET",
          "declared_method": "GET"
        },
        "well_known": {
          "present": true
        },
        "method_bypass": {
          "note": "the alternate method would be POST, which is never sent to a target solely to test for a bypass",
          "method": "POST",
          "probed": false
        }
      },
      "payability": {
        "live": "LIVE_PAYABLE",
        "note": "we never pay the target by design: post-payment delivery is not observable from here and is never inferred",
        "delivery_verified": "UNAVAILABLE_BY_DESIGN"
      },
      "differences": [
        {
          "field": "price",
          "reason": "the amount was stable across 3 observations and differs from the declared one (1.20x)",
          "rule_id": "XCC-010",
          "declared": "10000",
          "observed": "12000",
          "severity": "warning",
          "confidence": "HIGH",
          "evidence_refs": [
            "hash:sha256:7b21..."
          ],
          "classification": "STALE_CATALOG_PRICE"
        }
      ],
      "duration_ms": 2410,
      "observed_at": "2026-08-10T14:03:11+00:00",
      "rules_version": "2026.08.09.1",
      "schema_version": "1.0.0"
    }
  }
}