Re: [ANN][XCP] Counterparty - Pioneering Peer-to-Peer Finance - Official Thread
Poloniex deposit is not working, too. 
Deposited some XCP 13 hours ago but it is not shown up on deposits, not even on pending deposits. Some similar experiences?
Deposited some XCP 13 hours ago but it is not shown up on deposits, not even on pending deposits. Some similar experiences? "The XCP is under maintenance" on bittrex 
I had same problem few days ago with Storjcoin X deposit. Send message to Polo support with tx ID and you will get it faster.