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Out of curiosity, why the huge difference in position sizes? Did STX seem to have that much better odds than your other trades?

Good thread so far. I switched from Townsend to NxCore in January. My (modest) requirement is to scan about 2000 symbols once per minute, so the minimal (under $500/month) version of NxCore suffices. I also bought 5+ years of historical "tapes" from DTN, providing a complete database for...

Well, I think I figured out the 18-coin one: Divide into 3 piles of 6 coins and put any two of these piles on the balance. If they're equal, then keep the 3rd pile, else keep the heavier pile. You have used the balance once and reduced the problem to 6 coins. Now divide those into 3 piles of...

If you're a C or C++ programmer, then I'd highly recommend DTN's NxCore service. You get a "tape" for each date containing every trade (and optionally quotes too) exactly as reported by the exchanges, and a well-designed API to access them.