Found 2 exchanges where Phoenix is traded for USDT. According to the data on 7 October the most optimal price to exchange PHB for USDT is ₮0.013 for 1 Phoenix. This rate is fixed at Huobi Global at the maximum trading volume of the pair PHB/USDT - 584.4 USDT.
Warning: some PHB markets show an abnormally wide spread — those quotes may be unreliable (thin liquidity or off-market trades). Cross-check the volume against several venues.