My algo tried to define options contract for strike price 5635 with expiry on 2025-04-14 (0DTE), but got error message saying "Unknown contract". I then found that this particular strike (5635) was missing from the options chain (spot was trading at around 5610 at that moment). I suppose SPX's strikes are listed every 5 points (unless the strike is very far away from spot or it is long dated like a year ahead). Is this common ? How do you guys' code cater for this missing strike ?
Lewis_Tang
