hey

we know that there are a lot of altcoin exchange.

and a lot new are lunching everyday.

as best for altcoin exchange we have Binance which allow us to change a lot of altcoin.

and also for token exchange we have crex24.

both of them have a small amont of withdraw and trading fee.

as for others  there are a huge amount of maintence fe and also a huge withdrawal fee.

so if some one need to exchange their altcoin/token they can use this two for exchange.

link for binance:https://www.binance.com/en

link for crex24:https://crex24.com/

as for others you can check the fees 

thank you.