Schwab provides historical option quotes free, but don't think they are "best platform".Will Ninja Trader or RT do this? Thoughts on others?
SPX, yes. Data back to 1-1-2007. EOD data only.
Source is OptionMetrics, the defacto data provider for every major investment manager and hedge fund.
All strikes, all contracts, yes.
I think we went though this once before. I only buy after I try. Been burned to many times. Sorry.
I am sure you can cancel any time. Try it for a month, cancel if you do not like. It will set you down whopping $89.