btc38's now ceased the deposit and withdrawal of xzc, and there's no offical notice when these will be reopened.
the  price difference between cryptopia and btc38 majorly comes from the liquidity problem of cryptopia, in which the price of xzc is now 0.001btc, however if you buy 100xzcs, the price will go up to 0.0019.
btc38 and bittrex shares the best liquidity of xzc-fiat or xzc-btc, by value, btc38 takes about 65%-80% of all xzc trading, while bittrex takes another 20%-30%.