Trades by instrument

{
  "id": 1,
  "method": "subscribe",
  "params": {
    "channels": [
      "orderbook.ETH-PERP.10.20"
    ]
  }
}

{
  "method": "<string>",
  "params": {}
}

{
  "direction": "<string>",
  "index_price": "<string>",
  "instrument_name": "<string>",
  "mark_price": "<string>",
  "timestamp": 123,
  "trade_amount": "<string>",
  "trade_id": "<string>",
  "trade_price": "<string>"
}