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P2B is a centralized cryptocurrency platform, that offers more than 200 tokens. It covers the following markets: BTC, ETH, USD, EUR, and a number of stablecoins. 
Decentralized exchange under Poloniex | Zero transaction fee
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.