basic.sx

{
  "name": "trade",
  "base": "",
  "fields": [
    {
      "name": "quantity",
      "type": "extended_asset"
    },
    {
      "name": "minreturn",
      "type": "asset"
    },
    {
      "name": "exchange",
      "type": "name"
    }
  ]
}