Bittrex API is very poor at filtering out order spoofing bots which is manipulative and makes it hard to place genuine orders - although this is a case of them letting others run these through the orderbook, not them doing it themselves I think.

I always believe all non-regulated exchanges front-run the order book, but unless one's the FBI how are you going to know it or prove it?

I think the main reason for the price discrepancy between BTC38 and Bittrex Zcoin price is that BTC38 is a CNY (Renmimbi) XZC (Zcoin) pair, and Bittrex is a BTC XZC pair. Otherwise every man and his dog would be arbitraging such a huge gap, and bring the prices into line.

If only XZC could be listed on one more large exchange that does a BTC XZC pair.