Swap fees arise from the difference in interest rates between the currencies (in forex trading) or assets involved in the transaction. If you are long on a currency pair where the base currency has a higher interest rate than the quote currency, the swap might be positive, meaning you could receive a fee for holding the position.
Example of Positive Swap Fee in Forex:
Long EUR/USD Position: If you’re holding a long position in EUR/USD and the interest rate in the Euro (EUR) is higher than the interest rate in the U.S. (USD), the swap fee could be positive, meaning you would receive a payment for holding that position overnight.