TD Ameritrade just reneged on its promise to allow this, which baffles me. Any other zero commission brokers allow this. Fidelity doesn't.
On Schwab, you cannot go on margins on your IRA, no level 3 (naked, short) allowed. Solo 401K is even more restricted, only level 1. If you are self employed, you can set up both a 401K and an IRA with Schwab. After that, I think you can roll 401K contribution into IRA to trade level 2.
What the hell is LEVEL-3 options? only been in this business for 35 years, what the hell do i know...