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Interesting. They can't make money on these via PFOF. So how can they guarantee fills at the official close? I suspect some of your orders will go unfilled.

I don't see TDAmeritrade as one of the supported market data providers, so you would have to buy data from someone else.

Are MOC/MOO trades free? If it is, l wander if these orders are guaranteed to be filled.

I don't think we're dumb, it's just I think we live in a kind of a bubble separated from most of the world. I wasn't born in US so I can relate a little better to people outside of US. I remember I was traveling in Thailand and the driver was telling me how there are lots of road accidents...

When I came to America and spoke no English, I thought Americans were the dumbest people. I was within a block of Key Food store and asked someone for directions. Of course I mis-pronounced it as K-Food. The lady said there's no such store around here :). Now when someone makes similar mistake...

Well, it's not that I don't want to help, it's that I'm afraid to tell you something that is completely wrong and/or misleading :) Just because I know there are many way more knowledgeable people here. So you've been warned. Whoever bought this option from you did not buy it so they can...

I don't think theta even matters with weeklies in your case. I think these are pure gamma plays - a binary outcome. Also, I think mentally, you will drive yourself crazy with this strategy. So many decisions to be made in short amount of time. Well, my friend, this issues I'm very familiar...

Your first description was clear as well. I've attended a chat room where the guy day traded weeklies but only on long side and only single legs. I am the last person to give you advice on options, but fwitw, I think you will have losses which will wipe out multiple days/weeks of your wins so...

Less charge for index:

This is a nice tool, just fyi. I think most brokers would follow this guideline. http://www.cboe.com/trading-tools/calculators/margin-calculator

May I ask you, if you had access to enough capital, would you simply day trade the underlying?

US Equities exchanges do, but not Options exchanges (as far as I know). The hidden equity orders are getting rebate for providing liquidity but rebate is smaller than for the displayed order.

Sure, why not.

That can work as well. I don't really understand why you even need it. What if you get filled between the spread but the bid and ask immediately drop?

I was referring to below. One of the great features of IB is that even their smart router is configurable. Make sure the highlighted check box is UN-checked as below.

Yes, but doesn't have to be dark only. Just make sure dark pools are included in smart route you use, I believe they are by default. Basically, you cannot get this price improvement unless the pros are willing to give it to you.

You are sending order using SMART? Make sure to include Dark Pools.

Oh, so no one wants to be liquidity taker I guess. Why don't you lift his offer when it's lowered to the price you wanted?

So you are trying to get improvement of less than $0.01? Or you are asking when the spread is wider? https://www.interactivebrokers.com/en/index.php?f=1058

Sorry, what did you mean by that?