I've visited all the 4 exchange options and haven't found any information about the fees.
Anyone knows them?
As for the Monsternode exchange, the fees are published inside the account, you can see it after registration.
I think it is exactly the same on other exchanges. If the exchange does not provide for registration, then fees are likely to be included in the exchange rate.
If you do not find the fees, then you can write to the support service of each exchange.