Execute combo orders

Execute multiple orders as a combo. Supports options spreads or option+perp combos. Only fill_or_kill (FOK) order type is supported.

Important Constraints:

• Price Increment (Perp Leg Only): If limit_perp_price is provided, it must be divisible by the minimum price increment for the base asset (see GET /api/v1/exchange_info → orderConstraints.priceIncrements). Option legs in combo orders are not subject to price increment validation since the net limit price is calculated across multiple legs.
• Size Increment: Each leg's size must be divisible by the size increment (see GET /api/v1/exchange_info → orderConstraints.options.sizeIncrements or orderConstraints.perpetuals.sizeIncrements)
• Single Perp Leg: Combo orders can have at most one perpetual leg
• Minimum Size: Each leg must meet minimum size requirements

Authentication Options:

• Signature: Include signature and signature_deadline fields in the request
• One-click session: Include x-one-click header with session hash (no signature needed)

When using one-click sessions, the signature fields can be omitted from the request.