Oh, I remember now. A few days ago IBKR screwed up something with AM vs PM expiration chain data. Lots of people had an issue on that date and could not trade. I think there was a separate thread about that. First time I saw an issue like that at IBKR. They knew about it (I called to inquire) but probably didn't fix it. I wonder if the issue you are getting is for that specific date?
On Tue, Jan 21, 2025, 10:20?PM Lewis_Tang via <lewis91960127=
[email protected]> wrote:
Thanks leop for your reply. I did use "SPXW" (and always use it) in the tradingClass specification. The following was exactly how I define the option contract :
opt_contract = Option(symbol='SPX', lastTradeDateOrContractMonth='20250116', strike=6005.0, right='C', multiplier=100, exchange='SMART', currency='USD', tradingClass='SPXW')
?
And after ib.qualifyContracts(opt_contract), I print the contents of opt_contract and got the following :
Option(conId=750912933, symbol='SPX', lastTradeDateOrContractMonth='20250117', strike=6005.0, right='C', multiplier='100', exchange='SMART', currency='USD', localSymbol='SPXW ?250116C06005000', tradingClass='SPXW')
?
Then, I tried to find out why the lastTradeDateOrContractMonth between the above two (20250116 vs 20250117) and later I noticed that 202250116 was a trade day where both AM and PM settlement existed for SPX/SPXW. I therefore searched over the web and noticed in Reddit that some traders suggested never trade AM-settled SPX options as the settlement time is set at the morning of next day. As my algo trades 0DTE SPX and expects settlement price to be set at market close on the same day, so this is why I do not want to trade AM-settled SPX options.
