IB has the Kospi futures and options in the works. You can also trade through a local or full-service broker.
You gonna need to keep a lot of money in the account for margin ... especially is you sell naked options.
There sure are. There's plenty of restrictions at this point. Options began being included in the PDT rule 8 months ago (October 2002). It's doubly strict on options, at least at some brokers, where the value of options are not counted toward the equity of the account toward the $25,000 minimum account value. Fun fun fun. That's on top of the fact that you can't use margin in buying options in the first place, yet the PDT rule is a Margin rule. On top of that, the C.B.O.E. has rules against "Unbundling" which try to dictate how you may or may not liquidate the options positions in your account. The C.B.O.E. also has rules against "electronic placement of orders", which means that you cannot create an auto-program to trade your options, which isn't such a bad restriction for most of us. And they also have rules against being on both sides of the market, which means you cannot place simultaneous orders to purchase puts and calls on the same option. And now the C.B.O.E. has Cancel Fees for options, which means if you decide to cancel an option order, or modify that order (which is viewed as a cancel), there will be a charge by the exchange if you do not get one execution per each cancel within that day. Some brokers pass this cancel fee onto the customer. There's a mythical Options Messiah that is prophesied to appear very soon (predicted by Nostradamus!) who will lead us out of bondage into a world of options freedom. His name is Boxus Maximus, and if you have faith you may be rewarded by his many signs and miracles. Keep chanting to yourself the mantra of the Faithful: "Box, Box, Box, Box . . ."
In the U.S., QQQ is the most liquid series by a longshot. That being said there are commodity options on futures that are highly liquid, but few to none can be traded electronically through an online broker.