The campaign is that when you finish their work and they will pay you for example if you join a signed affiliate, the person paying you will tell you what to do to complete the task. Assigned to high rankers from more members 

When you exchange currency with others, of course you have to pay a small fee. If you do not want to charge, use coinbase. Coinbase supports the same account in the coinbase wallet will not charge if the wallet is not a coinbase will charge