Complex Instruments and Signed Prices

All price fields in the BOE protocol are signed values capable of accommodating complex instruments that can be negative (See Data Types for a description and an example of using the Binary Price type with a negative price). For an example of the Binary Price type with a negative price value in an application message, see NewComplexOrderUSOptionsV2 (Effective TBD).

Cboe Titanium U.S. Options BOEv3 Specification - Complex Instruments and Signed Prices | Cboe