contract2.gm

{
  "name": "wrapcost_row",
  "base": "",
  "fields": [
    {
      "name": "item_type",
      "type": "uint8"
    },
    {
      "name": "tier",
      "type": "uint8"
    },
    {
      "name": "amount",
      "type": "uint64"
    }
  ]
}