As of Monday, TD Ameritrade will support CBOE’s Futures market for Bitcoin. The fee structure will be the same as other leading futures, while the margin requirements will be 1.5 times their usual margin requirement for futures. This is involved with “adequate liquidity” as required to trade futures.
TD Ameritrade may also support the CME futures contract. The two contracts differ in that CME’s contract is for 5 Bitcoins versus a 1 Bitcoin contract from CBOE.
TD Ameritrade is monitoring the opening of the CME contracts starting Sunday evening before making the decision to support the CME contract.