For traders, they will need to pay gas fee and transaction fee.
Gas fee will be about 1/100 of that on Ethereum on mainnet.
Transaction fee will be set by operators - creator of the perpetual market. For pools operated by DAO, the transaction fee will be 0.07%, 0.015% of which will go to DAO Vault, 0.055% will go to LP.
But we will have transaction mining program going on when launching, please refer to proposal25 for details.