curl --request GET \
  --url https://api.example.com/trading/holdings

{
  "data": [
    {
      "venue": "kalshi",
      "marketId": "<string>",
      "outcomeId": "<string>",
      "side": "long",
      "size": 1,
      "outcomeLabel": "<string>",
      "conditionId": "<string>",
      "avgPrice": 123,
      "pnl": 123
    }
  ],
  "cursor": "<string>"
}