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Part of what you ask for is about 4min into the link provided by guru. Since you indicate you wish to close a spread, and using "market orders" should be generally frowned on... If you are familiar with your product, you should have a handle on how much you are willing to accept from the MID...

Today received an email, and this link was in it, which answers more clearly: "https://tlc.thinkorswim.com/center/faq/Prophet-Charts.html#q_03" body of link: How do I chart an option/option spread? To chart an option, go to Trade>All Products and expand one of the option series, then right...

For the "symbol" selection: Enter what you wish to observe! Note: For options, TOS requires a leading ".". Note: The entry you use is displayed directly below. Also beware TOS will display a "BAR" ONLY if volume was >0! The BARs reflect trades, NOT BID/ASK data.

Do you have TOS (ThinkorSwim)? It does and is free if you have an account. -- Below a long SPY straddle (daily bars) for reference.

If you desire more strikes, reference the Monthlies instead of the Weeklies! -- That is fairly consistent across all equities and indexes.

any details? - provide your position, to promote response (strikes, expiry, etc)

negative "gemma"? Depending on your strikes (all OTM or far OTM, balanced, ITM, etc) and your planned time horizon, you may wish to consider what the odds are of PnL projections for remaining for a range of time, and exit accordingly (instead of relying solely on theta)! If you have a balanced...

They have both (1) Historic (a one-time purchase of historic data based one precisely what you chose), and (2) Subscription services, to allow you to keep current, if you want! -- Seems you will need both! If you do, you may want to start the Subscription, then once going, purchase the...

Similar thoughts to qlai ... When I go to working an option order to get a "good" fill (manual, not automated, mind you), the notion of automating that process, which would be required if coding a "black box" leave me feeling less enthusiastic, to state it mildly. -- If you are willing to...

It is possible some may be using the TDA-API for trading (I hope/wish so), but know of no-one doing that. I have heard that Interactive Brokers has an API, (that can be used for trading?), but also know of no-one doing that either! -- I know of people using TradeStation for programmed trading...

I think he is referring to an "API", which for TDA would be the TDA-API, as they have no TOS API. However the TDA-API is lacking good support.

Recommend you reread your post, then revise to what you "intended" to post. -- SPY is currently around 290, a DITM PUT would > 290! (not 205) -- Did you mean 305?

EOD is for End Of Day

You are correct! -- If using OnDemand, you can get OI, Volume, B/A, but not the greeks or IV. You can try to calc the greeks yourself OR, if you are OK with EOD only, you can use "thinkBack", which does support Greeks!

It depends on what specifically you need! If you want volume for a specific date, you may be able to achieve using OnDemand. If you want volume for a specific option, just use Charts, and specify the option, and insure volume is included! Such as below: If you need much more complex than...

"https://www.google.com/search?q=what+is+contango+and+backwardation&oq=what+is+contango&aqs=chrome.1.69i57j0l5.5488j0j8&sourceid=chrome&ie=UTF-8" one way to monitor: "http://vixcentral.com/" Note that this relationship also holds for SPX option series directly as well (as long as you discount...

I agree that randomly (or systematically) is dangerous. Depending on your trade/process, you should observe that launching the trade at certain times is too risky, so avoiding those time (or altering of the trade to something more likely to work) may be called for. For example, my trades work...

:-) Agreed! "Consistently profitable" would be sweet! <-- I think that is not in my wheelhouse!

Yes! Agree. -- the trade must support what the market give you and "roll" with the changes. -- These are NOT "cannon-launch" trades, but are managed! -- by "not a scalable process" are you referring to position sizes or "consistent amount of money at risk?" -- or something else.

For me, there is a process, that is "slowly" being tweaked. I am looking for consistent "base-hits", so when a great pitcher is on the mound, I don't go to bat! I think each individual will have unique process to suit his/her comfort zone. -- I also think this is getting more and more...