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Decentralized Exchange
Stellarport is a trading gateway to the Stellar Decentralized Exchange and wallet for handling multiple assets, including XLM. It also provides an opportunity to participate in the XLM giveaway program. 
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.