{
  "id": 42,
  "jsonrpc": "2.0",
  "method": "private/subscribe",
  "params": {
    "channels": [
      "user.isolated.portfolio.USDC"
    ]
  }
}

{
  "jsonrpc": "2.0",
  "method": "subscription",
  "params": {
    "channel": "user.isolated.portfolio.USDC",
    "data": {
      "available_funds": 40,
      "currency": "USDC",
      "equity": 50,
      "initial_margin": 10,
      "main_uid": 1000,
      "maintenance_margin": 5,
      "margin_balance": 50,
      "user_id": 123456
    }
  }
}