https://medium.com/eidoo/eidoo-exchange-how-the-hybrid-exchange-works-c8aa0223f094
As far as I could understand the Eidoo wallet will support absolutely any ERC20 token, it will be visible in the balance, but it does not mean that you can trade them, they may be unsupported on the exchange. Most popular tokens are going to be added, but how about various airdropped shitcoins? I will have to use EtherDelta anyway?
And I did not see anything about the usage of EDO tokens in the article, I thought there is going to be an EDO fee for any operations, but they are talking only about the gas fees in ETH.
This might help, I copy it directly from their telegram, dated 13.02.2018
EDO tokens will be used to pay the fees of the advanced services into the Eidoo app (decentralized exchange, debit card, decentralized marketplace and others). Everytime you will pay a fee with EDO half will be burned decreasing the total supply.
And seconded by another team member (on different response to different user)
Yes, the exchange fee will be in EDO while the transaction fee will be in ETH to pay the ethereum blockchain