When it comes to cryptocurrency exchanges, there is one constant to be found : all altcoins have to be traded against either Bitcoin or Litecoin. Exchanges such as Cryptsy and Bittrex have been experimenting with additional trading markets in the form of Blackcoin and Primecoin, but these endeavours have not lead to any major successes just yet. EmpoEx, a recently launched digital currency exchange, is looking to open up an additional trading market in the form of Viacoin. On the other hand, some coins will be facing delisting , so let’s look at those as well.