Processing fees for ETH to ETH transfers.
To ensure that transactions are processed on the Ethereum network (blockchain), outgoing transfers sent to external Ethereum wallet addresses are charged a "mining" or "network" fee. This fee is paid directly to the miners, Wyre does not profit from sending or receiving Ethereum.
Wyre has a dynamic miner fee structure which means the fee changes according to the market conditions.
You can always check the miner fee on the Wyre dashboard: