curl --request GET \
  --url https://test.deribit.com/api/v2/public/get_book_summary_by_currency \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "id": 9344,
  "method": "public/get_book_summary_by_currency",
  "params": {
    "currency": "BTC",
    "kind": "future"
  }
}
'

{
  "jsonrpc": "2.0",
  "id": 3659,
  "result": [
    {
      "volume": 0.55,
      "underlying_price": 121.38,
      "underlying_index": "index_price",
      "quote_currency": "USD",
      "price_change": -26.7793594,
      "open_interest": 0.55,
      "mid_price": 0.2444,
      "mark_price": 80,
      "low": 0.34,
      "last": 0.34,
      "interest_rate": 0.207,
      "instrument_name": "ETH-22FEB19-140-P",
      "high": 0.34,
      "creation_timestamp": 1550227952163,
      "bid_price": 0.1488,
      "base_currency": "ETH",
      "ask_price": 0.34
    }
  ]
}