Found 1 exchange where USD1 is traded for BTC. According to the data on 4 September the most optimal price to exchange USD1 for BTC is ₿0.000013 for 1 USD1. This rate is fixed at Upbit at the maximum trading volume of the pair USD1/BTC - 0 BTC.
The maximum daily trading volume is observed in the USD1/USDT trading pair at BTCC and reaches ₿ 1 784.09 (2.68% of the exchange's total trading volumes) at the price ₿ 0.000013 per 1 USD1.
The minimum price to buy USD1 for BTC is 0.000013 - on the exchange Upbit.
The maximum price to buy USD1/BTC is 0.000013 - on the exchange Upbit.