Thanks for all the comments everyone, it's greatly appreciated. I welcome feature requests/suggestions/comments.

I just want to remind everyone about our liquidity provider rebates of 0.55%. I often hear comments such as "I like your service; I would use it more often if there was more volume." Obviously this is a chicken and egg problem. Thus, the 0.55% liquidity provider rebates.

Liquidity provider rebates are given to those who place their order and have it queued in the orderbook (it's not immediately executed and they have to wait). So, instead of paying the normal order execution fee, you're actually getting paid to have your orders executed.