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Get interest on $100K by spending only $2K using FOREX rollovers?
I'm smart enough to know that the answer to your questions is 'no'.  There is no arbitrage scenario where you can trade currencies and be guaranteed a return. If there were, the thousands of PhD's and quants at hedge funds like DEShaw and Bridgewater would have already figured it out. You're basically trying to come up with a scenario that is risk free yet yields you better than market interest rates.  Impossible. I'm not smart enough to know why, but my guess is that your statement "I only need $2k margin" is incorrect.  You only need $2k as capital, but you are 'borrowing' on margin the other 98k and you'll need to pay interest on that borrowed amount, every day.  You also run the risk of your investment turning sour and the trading firm requiring a higher margin.