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This is why you don't withdraw. Just arbitrage back the other direction.

My arbitrage script was weighted to favor rebalancing my portfolio.

Are you talking about pair trading? How do you do it, since you can't go short in crypto? (At least not if you are not using bitfinex)

You short by selling. See my sibling comment: https://news.ycombinator.com/item?id=16931793

Yes I have answered on that link. I think in that case is unrealizable.