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Where can I trade FX spot options, other than saxobank.com? 
Have you looked at ThinkorSwim, which is now part of TD Ameritrade? Because of their new owner, you'll certainly be accepted as a US customer and the support will likely be responsive. They are certainly pushing webinars and learning resources around the ThinkorSwim platform. At the least you can start a Live Help session and get your answers. That link will take you to the supported order types list. Another tab there will show you the currency pairs. USD is available with both CAD and JPY. Looks like the minimum balance requirement is $25k across all ThinkorSwim accounts. Barron's likes the platform and their annual review may help you find reasons to like it. Here is more specific news from a press release: OMAHA, Neb., Aug 24, 2010 (BUSINESS   WIRE) -- TD AMERITRADE Holding   Corporation (NASDAQ: AMTD) today   announced that futures and spot forex   (foreign exchange) trading   capabilities are now available via the   firm's thinkorswim from TD AMERITRADE   trading platform, joining the recently   introduced complex options   functionality.