expiry_market::fee_incentive_subsidy_amount — a sponsor pays part of the trader's MINT
fee, bounded by the expiry's remaining sponsored balance. Mints only; redeems pay in full.
rate is the protocol's fee_incentive_subsidy_rate (1e9-scaled), 20% when omitted.
expiry_market::fee_incentive_subsidy_amount— a sponsor pays part of the trader's MINT fee, bounded by the expiry's remaining sponsored balance. Mints only; redeems pay in full.rateis the protocol'sfee_incentive_subsidy_rate(1e9-scaled), 20% when omitted.