Sending coins to the blockchain costs a network fee. It depends on the asset and the network and follows the load of the network: when the network gets busy the fee goes up at once, when it calms down the fee comes down gradually. It covers the cost of the transfer in the blockchain, with a minimum and an upper limit.

The fee is shown in the withdrawal form next to each network and under the amount: Network fee. Choosing another network may be cheaper if the receiver supports it.
The fee is deducted from the amount you enter. Amount to receive shows how much arrives. The arrows button in the amount field adds the fee on top, so the receiver gets the amount you typed.
The minimum withdrawal is shown under the amount field. It depends on the network fee, so it can change too.
The amount must be more than the network fee. In Bitcoin, Litecoin and Dogecoin the Amount to receive must also not be tiny: the network does not accept such small payments. Otherwise the form says Amount is below the minimum withdrawal.
If the fee of a network is not known yet (for example, a network that was just added), withdrawals there are paused for a while and the form says Withdrawals on this network are temporarily unavailable. Please try again later.
If the fee goes up after the form showed it and before you confirm, the form shows the new fee and asks you to confirm again. If it goes down, you never pay more than the fee you confirmed.

A withdrawal to the deposit address of another Strade user does not go to the blockchain and has no network fee. After you enter such an address, the form shows Internal transfer to a Strade account: instant, no network fee and a network fee of 0: Sending to another Strade user.

How to withdraw: How do I withdraw crypto?

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What is the network fee on withdrawals?