Site: portion.io
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Kryptono is a centralized cryptocurrency exchange incorporated under  the law of Singapore. The KNOW token is the platform’s utility token. 
Crypto Token Manager & Decentralized Exchange Manage and Trade Ethereum-Based Tokens
PrimeXBT is a Bitcoin-based platform, offering leveraged trading on several digital assets including Bitcoin, Ethereum, Litecoin, and Ripple. The company was founded in 2018 and from the very first day, it has grown exponentially and currently serves clients in more than 150 countries.