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Does whoever is closest win or only if you guess the exact price?

Price must be exact to win ( up to two decimal points, example 107.77 USD )

What's the exact time and exchange? We wouldn't want you to bluff about the prize. ;)

It's in the description

May 29, 2017 11:50PM ET then you will receive 1 ETHEREUM. Coinbase USD price will be used to determine the price.