Slush does not charge any additional platform fees for standard wallet actions like sending or receiving. You only pay the Sui Network Gas Fee, which is a tiny amount of SUI used to compensate the validators who keep the network running and to cover the network storage costs. When using specialized features like Slush Strategies or buying assets via third-party providers, any applicable service fees are clearly displayed in the transaction summary before you confirm.
Review the Network Fee on the final confirmation screen before confirming any action.