{
  "jsonrpc": "2.0",
  "method": "subscription",
  "params": {
    "subscription": "0x7a8b9c0d1e2f...",
    "channel": "user_fills",
    "filters": {
      "symbols": [
        "BTC"
      ]
    },
    "result": {
      "fillId": "fill_123456789",
      "orderId": "1234567890",
      "clientOrderId": "550e8400-e29b-41d4-a716-446655440000",
      "symbol": "BTC",
      "side": "buy",
      "price": "64950.0",
      "quantity": "0.005",
      "quoteQuantity": "324.75",
      "fee": "0.1623",
      "feeAsset": "USDT",
      "isMaker": true,
      "timestamp": 1710000001000,
      "tradeId": "trade_987654321",
      "hyperethTradeId": "1710000001000001",
      "eventTime": 1710000001000
    }
  }
}