Found 2 exchanges where 1INCH is traded for BTC. According to the data on 13 August the most optimal price to exchange 1INCH for BTC is ₿0.0000013 for 1 1INCH. This rate is fixed at WhiteBIT at the maximum trading volume of the pair 1INCH/BTC - 0.4 BTC.
The maximum daily trading volume is observed in the 1INCH/USDT trading pair at BitDelta and reaches ₿ 50.88 (1.23% of the exchange's total trading volumes) at the price ₿ 0.0000013 per 1 1INCH.
The minimum price to buy 1INCH for BTC is 0.0000013 - on the exchange CEX.IO.
The maximum price to buy 1INCH/BTC is 0.0000013 - on the exchange WhiteBIT.
Warning: some 1INCH markets show an abnormally wide spread — those quotes may be unreliable (thin liquidity or off-market trades). Cross-check the volume against several venues.