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Site: portion.io
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CEX.io can be called one of the oldest exchange platform and can be used all over the world. Today this exchange supports Bitcoin, Ethereum and the number of other currencies as well. CEX. io was established in 2013 in London as an exchange and cloud mining provider.
Cryptocurrency exchange
Kryptono is a centralized cryptocurrency exchange incorporated under  the law of Singapore. The KNOW token is the platform’s utility token.