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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. 
Cat.Ex exchange platform was founded in mid-2018. Its headquarters is based in China. Providing its local token holders with dividends on a daily basis, Cat.Ex utilizes transaction mining in order to ensure an efficient profit-sharing. 
CoinTandem allows end-users to buy Bitcoin via wire transfers or credit card, upon completing an efficient one-time compliance process. The website is a gateway between FIAT to the Crypto world, making the process clear and easy.