The exchange fee is a transparent 0.5%.
This is split between Argent and Paraswap, the decentralized exchange aggregator that enables the service. (Out of the 0.5% fee, Argent takes 85% and Paraswap takes 15%).
Even with the fee the rates should still be better than in our previous exchange due to the routing optimization.
There is also a network fee (gas), which is variable. Argent does NOT profit from the network fee; it goes to parties processing the Ethereum network. For more information on this please read our network fee policy.