Found 4 exchanges where 0x Protocol is traded for EUR. According to the data on 6 August the most optimal price to exchange ZRX for EUR is €0.0686 for 1 0x Protocol. This rate is fixed at Bitvavo at the maximum trading volume of the pair ZRX/EUR - 15.3 ths. EUR.
The maximum daily trading volume is observed in the ZRX/USDT trading pair at Poloniex and reaches € 1,350,434.97 (0.253% of the exchange's total trading volumes) at the price € 0.0681 per 1 ZRX.
The minimum price to buy ZRX for EUR is 0.0682 - on the exchange Bit2Me.
The maximum price to buy ZRX/EUR is 0.0689 - on the exchange OKEx.