Looks like at interactive brokers you will only be able to trade futures on the long side.....guess anyone looking to short is out of luck if they have an account at IB!!!!
Peterffy has sounded alarms before about the dangers of bitcoin, but his firm is allowing traders access to the futures products as of Monday, at a 50 percent margin requirement. Traders will be able to take long positions only, at $5 a contract, and won't be able to take a short position, or a bet on a decline. The steep price per contract —normally the broker charges 25 cents to 80 cents a contract — is to pay Interactive for the risk, Peterffy said.