Generate a QR code PNG (returned base64-encoded in JSON) for any text or URL using default

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xFFc458dB291b4ABcE020fE3de4f91F2770E537b1",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "data": "https://payapi.market"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "back_color": "#ffffff",
          "border": 4,
          "box_size": 10,
          "data": "https://payapi.market",
          "error_correction": "M",
          "fill_color": "#000000",
          "format": "png",
          "height": 330,
          "image_base64": "iVBORw0KGgoAAAANSUhEUgAAASIAAAEiCAYAAABdvt+2AAAABmJLR0QA/wD/AP+gvaeTAAAF...",
          "modules": 25,
          "size_bytes": 512,
          "version": 2,
          "width": 330
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "properties": {
                "data": {
                  "description": "Text or URL to encode, up to 4296 characters.",
                  "type": "string"
                }
              },
              "required": [
                "data"
              ],
              "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": {
              "properties": {
                "back_color": {
                  "description": "Background colour as normalised #rrggbb hex.",
                  "type": "string"
                },
                "border": {
                  "description": "Quiet-zone border width in modules.",
                  "type": "integer"
                },
                "box_size": {
                  "description": "Pixels per QR module.",
                  "type": "integer"
                },
                "data": {
                  "description": "The text or URL encoded into the QR code.",
                  "type": "string"
                },
                "error_correction": {
                  "description": "Error-correction level used: L, M, Q, or H.",
                  "type": "string"
                },
                "fill_color": {
                  "description": "Foreground colour as normalised #rrggbb hex.",
                  "type": "string"
                },
                "format": {
                  "description": "Image format of the returned bytes; always 'png'.",
                  "type": "string"
                },
                "height": {
                  "description": "PNG height in pixels.",
                  "type": "integer"
                },
                "image_base64": {
                  "description": "Base64-encoded PNG of the QR code.",
                  "type": "string"
                },
                "modules": {
                  "description": "QR module count per side (the grid dimension).",
                  "type": "integer"
                },
                "size_bytes": {
                  "description": "Byte length of the raw PNG.",
                  "type": "integer"
                },
                "version": {
                  "description": "QR version (1-40) chosen to fit the data.",
                  "type": "integer"
                },
                "width": {
                  "description": "PNG width in pixels.",
                  "type": "integer"
                }
              },
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://qr-api-production-1836.up.railway.app/generate/basic"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://qr-api-production-1836.up.railway.app/generate/basic");
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://qr-api-production-1836.up.railway.app/generate/basic")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header