According to Fortune, Circle is paying $400 million for the acquisition. Poloniex has been around for years and used to be one of the biggest exchanges out there — there are now many exchanges competing with Poloniex.
Circle is an interesting startup because it’s hard to keep track of what it does. The company first pitched itself as a bitcoin company that wants to make bitcoin more accessible. Circle wanted to become the PayPal of bitcoin. You could buy and sell bitcoins quickly and easily without any technical knowledge.

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