This morning I saw this message from the CEO of Aphelion. They disabled trading, probably because Aphelion had NEX trading pairs, and Aphelion is no regulated exchange.
All market pairs in the Aphelion DEX will be disabled on November 21, 2018 .
Funds are safe and even if you don’t cancel your orders or withdraw your funds we will process those automatically starting on Friday November 23rd, 2018 .
Get your NEX tokens away from this stupid exchange, and wait for NEON EXCHANGE!