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I've heard of strategies where multiple accounts can collude to manipulate the solo bots that make statistical decisions. Is this a real danger when professional companies start getting involved in crypto?

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Hmm, just looking at GDAX's API, you aren't able to tell who's making an order. You don't know if it's one account with ten orders, or ten accounts with one each. So I don't see why multiple accounts would be an advantage.

One thing that springs to mind is that it would allow you to have POSITIONS on both sides of the market, you could use this to create a series of small sell orders that would lure the bots down towards a larger buy order.

You could do this by just placing orders, but I guess in some instances it would be beneficial to be able to hold positions in both directions.

The API let's you take positions on both sides with a single account, or prevent yourself from self-trades by setting a flag.

EDIT: Nvm, the flag just specifies what the behavior is in the event that the system encounters a self-trade: decrement and cancel, cancel resting, cancel incoming, cancel both.

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