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Bisq exchange was launched back in 2014. At that time it was one of the first Decentralized Autonomous Organizations (or simply DAO). According to the founders of this exchange, one of the goals of Bisq network is to "keep the original spirit of Bitcoin alive".
Founded in 2011, Paymium describes itself as the first Bitcoin exchange in Europe. It is registered in France as a SAS company and operates as a Bitcoin trading platform. 
AENX, also known as AEN Exchange, is a digital asset trading platform developed by Aenco Limited.