Graph-aware trust score for an A2A/x402 agent — adversarial-resistant sybil/collusion-ring

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xa4Ae721f1492C831201A8e8aF344d51107875aA4",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "job": {
            "capability": "summarize",
            "price_usdc": 0.05
          },
          "provider_id": "0xtest"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "explanation": "High LCB from strong completion history.",
          "flags": [],
          "provider_id": "0xtest",
          "routing_decision": "ROUTE",
          "score": 0.71
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "properties": {
                "job": {
                  "properties": {
                    "capability": {
                      "type": "string"
                    },
                    "price_usdc": {
                      "type": "number"
                    }
                  },
                  "required": [
                    "capability",
                    "price_usdc"
                  ],
                  "type": "object"
                },
                "provider_id": {
                  "description": "Wallet/agent address being scored",
                  "type": "string"
                }
              },
              "required": [
                "provider_id",
                "job"
              ]
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "type": "string"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://trace-api-nk2026.azurewebsites.net/v1/x402/score"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://trace-api-nk2026.azurewebsites.net/v1/x402/score");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

import httpx
res = httpx.get("https://trace-api-nk2026.azurewebsites.net/v1/x402/score")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header