Found 2 exchanges where Qtum is traded for BTC. According to the data on 7 August the most optimal price to exchange QTUM for BTC is ₿0.00001 for 1 Qtum. This rate is fixed at CoinEx at the maximum trading volume of the pair QTUM/BTC - 0 BTC.
The maximum daily trading volume is observed in the QTUM/USDT trading pair at Hotcoin Global and reaches ₿ 5.25 (0.0358% of the exchange's total trading volumes) at the price ₿ 0.00001 per 1 QTUM.
The minimum price to buy QTUM for BTC is 0.00001 - on the exchange CoinEx.
The maximum price to buy QTUM/BTC is 0.00001 - on the exchange Gate.io.
Внимание: у части рынков QTUM аномально широкий спред — такие котировки могут быть ненадёжными (низкая ликвидность или нерыночные сделки). Сверяйтесь с объёмом и несколькими площадками.