[ { "period_start": 1451606400, "volume": "1095.22020000", "num_trades": 1920 }, { "period_start": 1483228800, "volume": "1883.98890000", "num_trades": 4302 }, { "period_start": 1514764800, "volume": "5295.74640000", "num_trades": 13908 }, { "period_start": 1546300800, "volume": "10712.38666886", "num_trades": 16552 } ]