hi everyone one: is thare any way to buy Ark with euros or dollars?

As for now dude you cant buy an ARK using dollars or euros directly but theirs a option ; buy Bitcoin or ETH and convert it to ARK

thank you man.

Which exchange can be used to trade eth/ark? I've seen that this isn't possible on bittrex...

Yeah, and bittrex now can not register new account, but you can buy ark with eth on binnace, okex or coss. But i suggestions you buy on binnace because it have big volume than all
https://www.binance.com/trade.html?symbol=ARK_ETH
https://www.okex.com/?forward=%2Fspot%2Ftrade%2Findex.do#ark_eth
https://exchange.coss.io/pair/ark-eth