This script is designed to located darkpool prints on SPY.
If you do not know what a darkpool is, please research into it.
Essentially, darkpools print at 8 am EST premarket almost everyday. When price hits these pockets, it is usually quite reactive to it since there are a large number of orders in that pocket.
When the script finds a darkpool print, it will plot the line until price hits the pocket, once the pocket is hit, the orders are filled entirely, hence the line will stop plotting. These pockets are only filled in the New York Cash session, if it isn't hit the day its printed, it remains open until it is filled.
For this script to work correctly, the user must have the Arca data exchange paid for since this is the only data that will show the wick prints during the premarket. Once the correct data is enabled, use the 1-5 minute candles for the plots to render correctly, you may have to use each one for best results.
Even though this script was made for SPY, it works on any ticker because any equity ticker has darkpool prints.
So if you want to use the script on other tickers besides SPY, you must purchase the according exchange data or the script will not work!
If you are in a different time-zone other than EST, you must configure the inputs in the script to match the 8 AM EST time for the script to print properly.
Darkpools are not an end all be all play, sometimes its a coinflip, its just another tool in you toolbox to help determine your move in the market.