Produce a normalized pre-sign evidence packet for one exact unpaid x402 v2 exact Base USDC

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xdb7b2b54f80479826222749a2ea73a8acc306e1e",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "maxTimeoutSeconds": 60
  }
]

{
  "bazaar": {
    "info": {
      "description": "Produce a normalized pre-sign evidence packet for one exact unpaid x402 v2 exact Base USDC requirement: request identity, selected requirement, public payer coverage, caller ceiling, optional baseline evidence, and an integrity digest. Does not sign, pay, construct a transaction, or recommend whether to buy.",
      "input": {
        "body": {
          "allowed_pay_to": [
            "0xdb7b2b54f80479826222749a2ea73a8acc306e1e"
          ],
          "max_amount_atomic": "20000",
          "method": "POST",
          "payer_address": "0x1111111111111111111111111111111111111111",
          "resource_url": "https://api.agentmercantile.com/v1/url-context"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "decision": "READY",
          "machine": "VM09",
          "methodology_version": "x402-presign-handoff-0.1.0",
          "status": "OK"
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "additionalProperties": false,
              "properties": {
                "allowed_pay_to": {
                  "items": {
                    "type": "string"
                  },
                  "type": "array"
                },
                "max_amount_atomic": {
                  "type": "string"
                },
                "method": {
                  "enum": [
                    "GET",
                    "POST"
                  ],
                  "type": "string"
                },
                "payer_address": {
                  "type": "string"
                },
                "resource_url": {
                  "description": "Public HTTPS x402 resource URL.",
                  "format": "uri",
                  "type": "string"
                }
              },
              "required": [
                "resource_url",
                "method",
                "payer_address",
                "max_amount_atomic",
                "allowed_pay_to"
              ],
              "type": "object"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "additionalProperties": true,
              "properties": {
                "decision": {
                  "enum": [
                    "READY",
                    "NOT_READY",
                    "INDETERMINATE"
                  ],
                  "type": "string"
                },
                "machine": {
                  "enum": [
                    "VM09"
                  ],
                  "type": "string"
                },
                "methodology_version": {
                  "enum": [
                    "x402-presign-handoff-0.1.0"
                  ],
                  "type": "string"
                },
                "status": {
                  "enum": [
                    "OK",
                    "PARTIAL",
                    "HOLD"
                  ],
                  "type": "string"
                }
              },
              "required": [
                "status",
                "machine",
                "methodology_version",
                "decision"
              ],
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://api.agentmercantile.com/v1/x402-presign-handoff"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://api.agentmercantile.com/v1/x402-presign-handoff");
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://api.agentmercantile.com/v1/x402-presign-handoff")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header