Hi guys - As part of a class I'm involved with at uni, I'm looking at data usage amongst option traders. I'm especially interested to know if there's a need/demand for End of Day option chain pricing information. My searches so far for such data have found only really costly or seemingly outdated providers. Is there an interest for something like this? If so, what kind of requirement -- full history, minute-level data or EOD or some other increment, IV/HV/greeks calculations as well? Would love to hear your thoughts!