Comment by downandout

Is your counterparty risk zero? Custody risk?

In the case of flash loans/swaps, the answer is yes. It's 0. Further, I never have any capital at risk, all of my bots use flash loans/swaps. These transactions are atomic, which means that either all parts of it succeed or they all fail (it's a "revert" in blockchain parlance). So I can borrow $200 million without any prior permission and do an arb/liquidation or anything else I want with it for the life of my transaction, with the only requirement being that I must return it by the end. If my arb/liquidation/whatever succeeds and I return the loan, I keep the profits. If not, it's as if the whole thing never happened. The only risk is the transaction fee, which on the chains I do this on are miniscule.

I realize that it sounds unbelievable, but it exists. My code does thousands of these daily. I am not the only one doing this. See https://eigenphi.io/ . With the exception of sandwich transactions, every one of the bots you see on there is making profits without any capital at risk.