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Get interest on $100K by spending only $2K using FOREX rollovers?
No free lunch You cannot receive risk-free interest on more money than you actually put down. The construct you are proposing is called 'Carry Trade', and will yield you the interest-difference in exchange for assuming currency risk. Negative expectation In the long run one would expect the higher-yielding currency to devalue faster, at a rate that exactly negates the difference in interest. Net profit is therefore zero in the long run. Now factor in the premium that a (forex) broker charges, and now you may expect losses the size of which depends on the leverage chosen. If there was any way that this could reliably produce a profit even without friction (i.e. roll-over, transaction costs, spread), quants would have already arbitraged it away. Intransparancy Additionaly, in my experience true long-term roll-over costs in relation to interest are a lot harder to compute than, for example, the cost of a stock transaction. This makes the whole deal very intransparant. As to the idea of artificially constructing a USD/USD pair: I regret to tell you that such a construct is not possible. For further info, see this question on Carry Trade: Why does Currency Carry Trade work?