A spot market deal is for immediate delivery, which is defined as two business days for most currency pairs. The major exception is the purchase or sale of USD/CAD, which is settled in one business day. The business day calculation excludes Saturdays, Sundays, and legal holidays in either currency of the traded pair. During the Christmas and Easter season, some spot trades can take as long as six days to settle. Funds are exchanged on the settlement date, not the transaction date.
One unique aspect of this international market is that there is no central marketplace for foreign exchange. Rather, currency trading is conducted electronically over-the-counter (OTC), which means that all transactions occur via computer networks between traders around the world, rather than on one centralized exchange. The market is open 24 hours a day, five and a half days a week, and currencies are traded worldwide in the major financial centers of London, New York, Tokyo, Zurich, Frankfurt, Hong Kong, Singapore, Paris and Sydney—across almost every time zone. This means that when the trading day in the U.S. ends, the forex market begins anew in Tokyo and Hong Kong. As such, the forex market can be extremely active any time of the day, with price quotes changing constantly.