Pre-settlement merchant screen: signed ALLOW/WARN/BLOCK on (domain, payTo, price) before y

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xffFf4B8Da8C165B556326453446F6940C8AFE0DB",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "100000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "address": "0x1111111111111111111111111111111111111111",
          "chain": "base",
          "domain": "example.com",
          "observed_price_atomic": "150000"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "feed": "merchant-screen"
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "properties": {
                "address": {
                  "description": "Optional — the payTo the agent observed.",
                  "pattern": "^0x[0-9a-fA-F]{40}$",
                  "type": "string"
                },
                "chain": {
                  "default": "base",
                  "enum": [
                    "base"
                  ],
                  "type": "string"
                },
                "domain": {
                  "description": "The merchant host the agent is about to pay.",
                  "type": "string"
                },
                "observed_price_atomic": {
                  "description": "Optional — atomic USDC price quoted to the agent. STRING (may exceed 2^53; a JSON number is rejected upstream).",
                  "pattern": "^[0-9]+$",
                  "type": "string"
                }
              },
              "required": [
                "domain"
              ],
              "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": {
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  },
  "payperbyte-service-metadata": {
    "serviceName": "PayPerByte",
    "tags": [
      "payperbyte",
      "merchant-screen",
      "storefront-risk",
      "clone-detect",
      "signed-verdict"
    ]
  }
}

curl "https://x402.payperbyte.io/feeds/merchant-screen"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://x402.payperbyte.io/feeds/merchant-screen");
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://x402.payperbyte.io/feeds/merchant-screen")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header