curl --request GET \
  --url https://api.joyride.exchange/v1/account

{
  "user_id": "alice",
  "available": 9500000000,
  "locked": 500000000,
  "positions": [
    {
      "instrument_id": "SOL_USDC-28FEB26-150-C",
      "quantity": 1000,
      "avg_price": 1500000
    }
  ]
}