basic.sx

{
  "name": "logbalances",
  "base": "",
  "fields": [
    {
      "name": "out",
      "type": "extended_asset"
    },
    {
      "name": "rewards",
      "type": "extended_asset"
    },
    {
      "name": "text",
      "type": "string"
    }
  ]
}