According to my research there are many legitimate exchange that we can use. Such as coinbase the alternative cryptocurrencies of ethereum and litecoin, the largest claiming $20 billion (£15billion) in currency exchanged. It is created GDAX global digital asset in last 2014 and was develop with the high volume of trading.
That's what we are waiting for, we need a high volume of trading to decentralized most of the alternative token now a days. But also, we need to set the thing about the registration fee of new token to this kind of exchange. Which is the common thing to impossible to get all the famous and not so famous token. What do you think folks?