Source-backed vendor regulatory evidence package

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xF21563B76cC165F337b67D9f304D4c60eADbbaa4",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "500000",
    "maxTimeoutSeconds": 300
  }
]

{
  "agentServicesQuote": {
    "operation": "build_vendor_evidence_package",
    "payment": {
      "amount": "500000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "currency": "USDC",
      "network": "eip155:8453",
      "payTo": "0xF21563B76cC165F337b67D9f304D4c60eADbbaa4",
      "price": "$0.50"
    },
    "schemaVersion": 1,
    "scope": {
      "method": "POST",
      "resource": "/x402/v1/vendors/evidence"
    }
  },
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "idempotency_key": "buyer-generated-request-001",
          "recovery_key": "0000000000000000000000000000000000000000000000000000000000000000",
          "vendor_token": "opaque-signed-reference"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "sources": [],
          "status": "complete",
          "tool": "build_vendor_evidence_package"
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "additionalProperties": false,
              "properties": {
                "idempotency_key": {
                  "maxLength": 128,
                  "minLength": 8,
                  "type": "string"
                },
                "recovery_key": {
                  "description": "Hex-encoded 32 random bytes generated and retained by the buyer",
                  "pattern": "^[0-9a-f]{64}$",
                  "type": "string"
                },
                "subject": {
                  "type": "string"
                },
                "vendor_token": {
                  "type": "string"
                }
              },
              "required": [
                "vendor_token",
                "idempotency_key",
                "recovery_key"
              ],
              "type": "object"
            },
            "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://experiment-001-production-90c3.up.railway.app/x402/v1/vendors/evidence"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://experiment-001-production-90c3.up.railway.app/x402/v1/vendors/evidence");
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://experiment-001-production-90c3.up.railway.app/x402/v1/vendors/evidence")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header