Maybe not, I'm just speculating that GDAX or coinbase may have added this as some sort of "sanity-check" in their system (regardless of the insane volatility in

Maybe not, I'm just speculating that GDAX or coinbase may have added this as some sort of "sanity-check" in their system (regardless of the insane volatility in crypto right now!) In the situation with ETH, a bunch of automated margin calls happened because of one large order on the books, dumping the price down to 10 cents! GDAX/Coinbase repaid a lot of people who lost money then, even though they didnt have to. They may now have some dumb heuristics that slow down trades / whatever if a bunch of large orders are going through, or price delta over a short time period goes too high. I remember looking at the charts today on GDAX and the 5 minute candle went from 20k open to 16k close before trading halted! I also heard from others that there were a lot of ~19k sells of 100 coins each on the books and executing. So yeah, just speculating that this may bave been the case of someones boss at GDAX/Coinbase telling engineering "please don't make us do that again", after they ate the cost last time! :-)