Withdrawal fee
A withdrawal fee is what an exchange charges to send crypto out to an external wallet — usually a flat amount per withdrawal that covers the network fee plus the exchange's margin.
Unlike percentage-based trading fees, withdrawal fees are typically flat per asset and network: a fixed USDT amount to withdraw USDT, adjusted occasionally as network conditions change. The exchange pays the actual on-chain cost and keeps the difference.
The network you choose dominates the cost. The same USDT withdrawal can differ by an order of magnitude between an ERC-20 transfer during busy hours and a cheaper network like TRC-20 — always compare the supported networks in the withdrawal screen, and confirm the receiving side supports the same network before sending.
Withdrawal fees are operational rather than trading costs, so they sit outside rebate programs — but they interact with payout design. Rebates settled by internal transfer to your exchange UID arrive without any withdrawal fee; you only encounter one when you later move funds off the exchange, on your own schedule, ideally batched so the flat fee is amortized over a larger amount.