curl --request GET \
  --url https://api.orderly.org/v1/public/system_info

{
  "success": true,
  "data": {
    "status": 0,
    "msg": "<string>",
    "scheduled_maintenance": {
      "startTime": 1618822380000,
      "endTime": 1618822440000
    }
  },
  "timestamp": 1702989203989
}