Yes, there may be a small fee. If your payout account receives funds in a currency different from the currency used by the customer, the payment provider may apply a currency conversion fee when the payout is processed. This fee is not added by the marketplace and is handled entirely by the payment provider or your bank.
For example, if a customer pays in EUR and your payout account is in GBP, your share will be converted into GBP before being deposited. The payment provider will use the current exchange rate and may deduct a small fee for the conversion. You can often minimise or avoid these fees by using a payout account that matches your typical payment currency, where available.