Found 11 exchanges where Dash is traded for BTC. According to the data on 26 July the most optimal price to exchange DASH for BTC is ₿0.0005 for 1 Dash. This rate is fixed at Azbit at the maximum trading volume of the pair DASH/BTC - 29.9 BTC.
The maximum daily trading volume is observed in the DASH/USDT trading pair at Azbit and reaches ₿ 113.29 (0.545% of the exchange's total trading volumes) at the price ₿ 0.0005 per 1 DASH.
The minimum price to buy DASH for BTC is 0.00049 - on the exchange Coinbase Pro.
The maximum price to buy DASH/BTC is 0.00053 - on the exchange CoinEx.