An interest rate swap is an exchange of interest payment ( e.g. fixed rate interest for floating) in the same currency. The FX swap is just like an interest rate swap except in more than one currency.
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Foreign currency futures are available both over-the-counter and on organized exchanges.
A foreign currency put option gives the purchaser the right, not the obligation, to buy a given amount of foreign exchange at a fixed price per unit for a specified period.
Both covered and uncovered interest arbitrage are risky operations in the sense that the returns are unknown until all transactions are complete.
When the cross rate for currencies offered by two banks differs from the exchange rate offered by a third bank, a triangular arbitrage opportunity exists.