i havn't heard of this mercatox before, but i am willing to see xas listed on new exchange, and i dont know how the team will do.
i register in coolcoin.com, but as i see the trading volume of xas on the past 24 hours is only several btc, i lose my interest, i prefer to wait for the next exchange
there is a rumor that coolcoin.com is the Jubi international, but i heard coinegg.com has the relationship with Jubi today, so anyone can tell me which one is or which is reliable and trustworth