This question comes up pretty much every week in the options industry. I don't know the OP's intent, but this question is classic and that is part of the reason most brokers won't touch this business or ramp up the margin requirement. This is the proverbial picking up dimes in front of steamrollers. In the '80s in the OEX the scheme was to sell very short-dated premium - if there is any. Customers would mark "opening orders" as "closing" to game the system. The intent is pretty much the same - sell very short-dated premium and pray. Firms figured it out and generally restricted the accounts. Today's technology is much better and most firms simply won't do it without a ton of SMA. In 87 the strategy self-corrected and simply destroyed the short put side of the equation. There are a number of funds that love this strategy and try to accomplish it in some size in the SPX, but with enormous margin requirements.