If you are long 1 lot of USD/JPY overnight and the position is rolled for 1 day, the swap (the cost of holding the position overnight) is :
- If long swap points of USD/JPY = -0.24
- Contract size = 100,000 ( 1 Lot = 100,000 of the first-named currency)
- Period(Day) = 1
- Swap calculation = -0.00024 * 100,000 * 1 = -24 JPY
If when the swap is applied to your account, the currency of your account is USD and USD/JPY is 123.456, finally -0.19(USD) will be applied to your one at end of day(21:59 GMT)