How do you find information about historical open interest on particular options on particular strikes? I used to keep track of it manually for contracts of interest to me because I don't know of a service that keeps track of daily open interest. Is there a site somewhere that shows the day to day open interest of options contracts?
I use LiveVol, their platform is awesome. Here is a link so you can get a 14 day free trail . You may even be able to do it using TOS thinkback.