Generate one UUID version 4 using server-side cryptographic randomness

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x12fe99C184192A0d4a3C507602ad4b03AA3A6fbb",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "7000",
    "maxTimeoutSeconds": 60
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "method": "GET",
        "type": "http"
      },
      "output": {
        "example": {
          "algorithm": "solgiery-random-v1",
          "entropy": {
            "hex": "80808080808080808080808080808080",
            "source": "os-csprng"
          },
          "result": "80808080-8080-4080-8080-808080808080"
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "additionalProperties": false,
              "description": "Unknown or duplicate parameters and null parameter values are rejected. JSON body: at most 65536 bytes, depth 16, and 4096 bytes per item. Repeated sample items together must fit 65536 bytes.",
              "properties": {},
              "required": [],
              "type": "object"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "additionalProperties": false,
              "properties": {
                "algorithm": {
                  "const": "solgiery-random-v1",
                  "type": "string"
                },
                "entropy": {
                  "additionalProperties": false,
                  "properties": {
                    "hex": {
                      "maxLength": 262144,
                      "pattern": "^([0-9a-f]{2})*$",
                      "type": "string"
                    },
                    "source": {
                      "const": "os-csprng",
                      "type": "string"
                    }
                  },
                  "required": [
                    "source",
                    "hex"
                  ],
                  "type": "object"
                },
                "result": {
                  "format": "uuid",
                  "type": "string"
                }
              },
              "required": [
                "algorithm",
                "result",
                "entropy"
              ],
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

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

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