Found 5 exchanges where Tezos is traded for BTC. According to the data on 28 July the most optimal price to exchange XTZ for BTC is ₿0.0000034 for 1 Tezos. This rate is fixed at Coinbase Pro at the maximum trading volume of the pair XTZ/BTC - 0.3 BTC.
The maximum daily trading volume is observed in the XTZ/USDT trading pair at Phemex and reaches ₿ 17.42 (0.228% of the exchange's total trading volumes) at the price ₿ 0.0000032 per 1 XTZ.
The minimum price to buy XTZ for BTC is 0.0000032 - on the exchange Upbit Indonesia.
The maximum price to buy XTZ/BTC is 0.0000035 - on the exchange WhiteBIT.
Внимание: у части рынков XTZ аномально широкий спред — такие котировки могут быть ненадёжными (низкая ликвидность или нерыночные сделки). Сверяйтесь с объёмом и несколькими площадками.