當然是NOMINAL，光interest rate swap 就可能400萬億了，OTC根本不透明，看看這一段

Since swaps are highly customized and not easily standardized, the swap market is considered an over-the-counter (OTC) market, meaning that swap contracts cannot typically be easily traded on an exchange. But that does not necessarily mean swaps are illiquid instruments. The swap market is one of the largest and most liquid global marketplaces, with many willing participants eager to take either side of a contract. According to the Bank for International Settlements, the notional amount outstanding in over-the-counter interest rate swaps was more than $341 trillion in 2019.1