The dip follows several days of big gains and record highs. Bitcoin broke through $4,000 a coin for the first time early Sunday morning, a record high, and continued to rise throughout Monday and early Tuesday morning, peaking at $4,339.79. Investors are most likely taking some profit after the rapid rise.
Mati Greenspan, an analyst at the trading platform eToro, told Business Insider: "Some profit taking is to be expected. Of course, if it gets out of hand, there isn't any real support anywhere close."
Bitcoin cash, the cryptocurrency that was split off from bitcoin at the start of the month, is also down Tuesday. Bitcoin cash is down 2.20% against the dollar to $295.35 at the time of writing.
Ethereum, the other major cryptocurrency by market capitalisation, is sliding too. Ethereum is down 2.43% against the dollar to $291.80.
Greenspan said: "Bitcoin cash is testing its usefulness. We haven't seen any sort of mass adoption of the bitcoin bastard as of yet. Unless that changes soon it could go to nil.
"Ethereum is building a range from $200 to $300. ICOs have slowed down so excitement has cooled as well. All things considered, it remains the crypto of choice for developers."