I'm just looking at trying to do that myself because I was curious, is there a way to show it as % of ath as I'm just getting a flat line for the S&P on my phone when trying to compare it to bitcoin.

@OP it's hard to correlate atm as bitcoin is quite young as a currency but you can certainly follow peaks and troughs and see if so far there are any trends.

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Bispex sounds like a margin trading service similar to bitmex? If so, you don't trade actual bitcoin you trade a contract equal to a certain number of bitcoins or a certain number of dollars and the site converts between the two.