When you send cryptocurrency, Coinbase may charge a network fee (also called a 'miner's fee') to process the transaction on the cryptocurrency network. The exact fee will depend on network conditions at the time of the transaction and will be disclosed prior to completing the send.
Network fees are outside Coinbase's direct control and can spike dramatically during periods of high blockchain congestion, meaning the cost of moving your crypto off Coinbase can be unpredictable and sometimes very high.
Every time you buy, sell, or convert cryptocurrency on Coinbase, you pay at least two layers of cost: a spread embedded in the displayed price plus an explicit Coinbase Fee, meaning the true cost is higher than the price shown before you preview the transaction. Debit card purchases incur significantly higher fees than bank account transactions, making payment method selection a material financial decision. You can reduce your fees by using a linked bank account instead of a debit card and by reviewing the full fee breakdown on the transaction preview screen before confirming.