QR code generator

[
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "FSnwAPTNNSxqnR8MtuNrtwLkyYusZ4hncp684HxYpdLb",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "3000",
    "maxTimeoutSeconds": 120
  },
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x55ae5d177cdc9493391a632794fd048e8dba4e20",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "3000",
    "maxTimeoutSeconds": 120
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "method": "GET",
        "queryParams": {
          "data": "https://example.com",
          "size": 256
        },
        "type": "http"
      },
      "output": {
        "example": {
          "body": "<svg xmlns=…>…</svg>",
          "contentType": "image/svg+xml"
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "properties": {
                "data": {
                  "description": "Payload to encode (max 2,048 UTF-8 bytes; QR capacity is lower at Q/H error correction)",
                  "maxLength": 2048,
                  "minLength": 1,
                  "type": "string"
                },
                "ecl": {
                  "description": "Error correction, default M",
                  "enum": [
                    "L",
                    "M",
                    "Q",
                    "H"
                  ],
                  "type": "string"
                },
                "size": {
                  "description": "SVG width/height in px, default 256",
                  "maximum": 1024,
                  "minimum": 64,
                  "type": "number"
                }
              },
              "required": [
                "data"
              ],
              "type": "object"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://toolvend.dev/qr"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://toolvend.dev/qr");
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://toolvend.dev/qr")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header