Because gold investment futures or spot are leveraged, that is, margin trading is adopted, but financing is actually carried out, and 1-N% margin is provided by the financing party. So if you use other people's financing money, of course there will be an overnight fee.

Foreign exchange gold is a general term for foreign exchange and gold, because in the financial investment market, foreign exchange and gold are often the most relevant, so people are used to mentioning gold and foreign exchange side by side.