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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. 
Decentralized Platform
Tux Exchange is currently not operating. It was closed in 2019 with a prior announcement as of June 15, 2019. July 6, 2019, was the deadline for the withdrawal of funds. Tux Exchange referred to “unfavorable conditions” and “low volume” as key factors stipulating the decision to close down.