I believe BabyPips school has a short bit on this subject - and someone correct me if I am in error as I don’t really look to trade based on swap/carry interest.
More or less you buy near the weekend to hold for interest over the weekend with a pair with a high interest rate differential. If doing it solely for a swap (carry) then you might look for a pair that is not just favorable on interest but also going in the “right” direction (if you are buying for interest the pair is in buy - or if selling the pair is in sell direction already), so that you don’t lose money on the trade and eat your interest profit. I had a demo trade where on two full lots of USD/CHF I made $4.47 … but every pip bad would eat maybe $18 of equity so definately want that trade to be profitable otherwise. In this case it was good for 25 pips which seem more important than the less than $5 swap… I could have lost on the swap interest and been further ahead than if I had a losing trade and a small amount of swap interest.
I would guess if you were very careful, last minute trade made beforethe weekend, a very tight stop loss and johnny on the spot to close the carry trade when the market opened you might be able to get some profit week in and out on this. For me it isn’t too practical in that sense …perhaps it could be done with a tight take profit limit if you can’t be on the computer when the market reopens? An idea.