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Funding rate formula: Funding rate = Clamp[Average premium index, Funding cap, Funding floor] To elaborate further, Average premium index = MA(Premium index – Interest rate) Interest rate = 0 Premium index = [(Best bid + Best offer) / 2 – Index price] / Index price MA refers to the moving average and it is calculated every minute Before the switch： Funding rate will be calculated using the premium index of each minute from the start of the period to present.

Price Limit （a）In first 10 minutes of newly listed Perpetual Swap contract: Upper limit = spot index price (1 + 0.5%) Lower limit = spot index price (1 - 0.5%) （b）After 10 minutes: Upper limit = Avg. premium within last 10min + spot index price (1 + 1%) Lower limit = Avg. premium within last 10min + spot index price (1 - 1%) Premium = Contract price – spot index price If the premium calculated deviates from the spot index price by 2% or is below 0: Upper limit = spot index price (1 + 2%) Lower limit

Time Highest price limit Lowest price limit Within 10 minutes of spot/margin listing No limit No limit 10 minutes after spot/margin listing Highest price limit = Min [Max (Index, Index × (1 + y%) + Average premium in last 2 minutes), Index × (1 + z%)] Lowest price limit = Max [Min (Index, Index × (1 – y%) + Average premium in last 2 minutes), Index × (1 – z%)] For details on the y and z parameters, refer to the following link: https://www.okx.com/trade-market/info/spot The average premium in the

Premium index = [Max (0, Impact bid price – Index price) – Max (0, Index price – Impact ask price)] / Index price The average premium index is calculated using a weighted moving average of the premium index over the last settlement interval. For example: Average premium index at Tn = (1 × Premium index at T1 + 2 × Premium index at T2 + ... + n × Premium index at Tn) / (1 + 2 + ... + n).

Average premium in the past 5 minutes is calculated as follows: Contract trading data per 200 milliseconds is obtained for the last 5 minutes, along with the spot index, and the mid-price per 200 milliseconds is calculated. Mid-price = (Best ask price + Best bid price) / 2. The mid-price minus the spot index is used as the premium basis per 200 milliseconds, and the average value of premiums over the last 5 minutes is calculated.

Updated Price limit rules: First 10mins of all newly listed futures: - Upper limit = Index price (1+25%) - Lower limit = Index price (1-25%) After 10min: Upper limit = Avg. premium/discount within last 10min + index price(1+3%) Lower limit = Avg. premium/discount within last 10min + index price(1-3%) premium/discount = (Contract price - index price) If the discount/premium calculated equals to 0, or deviates from the index price by 25% - Upper limit=index price (1+25%) - Lower limit=index price (

Premium index Premium index = [(Best bid + Best ask) / 2 - Index price] / Index price Premium index = [Max (0, Impact bid price – Index price) – Max(0, Index price – Impact ask price)] / Index Price Note: Impact bid and ask prices are calculated using impact value. For more details, refer to our product documentation.

(*not applicable for Portfolio Margin) Both the buyer and the seller have to pay a margin to open a position. potential risks The potential gain from buying an option contract is unlimited, and the loss of a buyer is only limited to the premium paid. However, the potential loss of selling an option is unlimited, but the profit of selling is limited to the premium received. The potential gains or losses for both buyers and the sellers are unlimited

The user needs to pay the premium and transaction fee to release the margin for the short position. Maintenance margin (MMR): Minimum margin required to maintain current positions. Liquidation will occur if the account equity drops below the maintenance margin. Buyer’s MMR is 0.

For example, funding fee calculations at 8:00 am UTC+8 every day will use the funding rate determined by the premium index from 12:00 am UTC+8 to 8:00 am UTC+8. Note that the funding rate may fluctuate before the funding fee is collected, so you need to dynamically manage your positions according to current conditions.

Existing Price limit rules: First 10mins of all newly listed futures: Upper limit = Index price (1+25%) Lower limit = Index price (1-25%) After 10min: Upper limit = Avg. premium/discount within last 10min + index price(1+3%) Lower limit = Avg. premium/discount within last 10min + index price(1-3%) Premium/discount = (Contract price - index price) If the discount/premium calculated equals to 0, or deviates from the index price by 25%: Upper limit = index price (1+25%) Lower limit = index price (1-

To continue providing you with high-quality options trading services, OKX will make the following adjustments to options fees at 7:00 am UTC on May 15, 2025: Before After this adjustment Trading fee Min (Fee rate × Contract multiplier × Contract size × Number of contracts, 12.5% × Option premium × Contract multiplier × Contract size × Number of contracts) Min (Fee rate × Contract multiplier × Contract size × Number of contracts, 7% × Option premium × Contract multiplier × Contract size × Number of

Specific price limit rules are as follows: Phase Highest price limit Lowest price limit Within 10 mins of spot/margin listing Index * (1 + X) Index * (1 - X) 10 minutes after spot/margin listing Min[Max(Index, Index (1 + Y) + Avg. premium in last 2 mins), Index * (1 + Z)] Max[Min(Index, Index * (1 - Y) + Avg. premium in last 2 mins), Index * (1 - Z)] Note: The parameters of X, Y, Z will be adjusted according to market conditions.

Specific price limit rules are as follows: Phase Highest price limit Lowest price limit Within 10 mins of spot/margin listing Index * (1 + X) Index * (1 - X) 10 minutes after spot/margin listing Min[Max(Index, Index (1 + Y) + Avg. premium in last 2 mins), Index * (1 + Z)] Max[Min(Index, Index * (1 - Y) + Avg. premium in last 2 mins), Index * (1 - Z)] Note: The parameters of X, Y, Z will be adjusted according to market conditions.