Optioncharts.io premium subscription is worth every penny.  It gives you updates on options data and most importantly GAMMA exposure in popular stocks/indexes. Use them to identify price targets. When high gamma exposure strikes get breached it often times gets pulled to the next high volume node. There are ways to view proxies to this data for free if you know what youre looking for but this is much easier to read and use. 250$ a year is a fraction of a rounding error in the potential profits one can make from understanding this data and how to trade with it.

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