Found 1 exchange where 0x Protocol is traded for BTC. According to the data on 1 September the most optimal price to exchange ZRX for BTC is ₿0.0000012 for 1 0x Protocol. This rate is fixed at Upbit at the maximum trading volume of the pair ZRX/BTC - 0 BTC.
The maximum daily trading volume is observed in the ZRX/USDT trading pair at BitDelta and reaches ₿ 163.89 (0.605% of the exchange's total trading volumes) at the price ₿ 0.0000012 per 1 ZRX.
The minimum price to buy ZRX for BTC is 0.0000012 - on the exchange Upbit.
The maximum price to buy ZRX/BTC is 0.0000012 - on the exchange Upbit.
Warning: some ZRX markets show an abnormally wide spread — those quotes may be unreliable (thin liquidity or off-market trades). Cross-check the volume against several venues.