Execute market orders

Execute a "marketable limit order" against the orderbook with built-in slippage protection.

Key Features:

• Slippage Protection: Requires limit_price to prevent execution at unfavorable prices
• Immediate Execution: Fills immediately against available liquidity (IOC/FOK)
• Multi-Asset: Supports both options and perpetual futures

Unlike traditional market orders, Kyan's market orders won't execute beyond your limit_price, protecting you from excessive slippage during volatile conditions.

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.