Found 1 exchange where USD1 is traded for BTC. According to the data on 25 August the most optimal price to exchange USD1 for BTC is ₿0.000012 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 ₿ 1 467.18 (0.763% of the exchange's total trading volumes) at the price ₿ 0.000012 per 1 USD1.
The minimum price to buy USD1 for BTC is 0.000012 - on the exchange Upbit.
The maximum price to buy USD1/BTC is 0.000012 - on the exchange Upbit.
Warning: some USD1 markets show an abnormally wide spread — those quotes may be unreliable (thin liquidity or off-market trades). Cross-check the volume against several venues.