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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.

Contracts that settle every 8 hours will see no change in their per-period funding rate; contracts that settle every 4, 2 or 1 hour will see a proportionally smaller per-period rate.What is Changing Current formula: Funding rate = clamp [ Average premium index + clamp ( Interest rate − Average premium index, 0.05%, −0.05% ), Funding rate cap, Funding rate floor ] Interest rate = 0.03% / ( 24 / Settlement interval ) Updated formula: Funding rate = clamp [ ( Average premium index + clamp ( Interest

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

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.

The buyer only pays a premium, no margin (not applicable for Portfolio Margin). The seller has to pay margin in USD, USDC, or USDG. The buyer only pays a premium, no margin (not applicable for Portfolio Margin). Potential risks The buyer's potential gain is unlimited and the loss is limited to the premium paid. The seller's potential loss is unlimited but the gain is limited to the premium received. P&L is denominated in the underlying coin.

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).

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.

If the option premium is 0.05 BTC, the trading fee is the minimum of 0.03% × 0.01 × 1 × 100 = 0.0003 BTC, and 7% × 0.05 × 0.01 × 1 × 100 = 0.0035 BTC, i.e., 0.0003 BTC (cap not triggered). Effective Notional = Min(1, 0.0003 / 0.03%) = 1 BTC. Trading volume unchanged. If the option premium is 0.001 BTC, the trading fee is the minimum of 0.0003 BTC, and 7% × 0.001 × 0.01 × 1 × 100 = 0.00007 BTC, i.e., 0.00007 BTC (cap triggered). Effective Notional = Min(1, 0.00007 / 0.03%) = 0.2333 BTC.

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.

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

Once the premium has sustained normal levels, the system will automatically revert the settlement frequency to 4 hours directly. Please Note OKX reserves the right to disable the automatic frequency adjustment feature for specific contracts based on market conditions. Please refer to the Perpetual Contract Information page or the API endpoint GET /api/v5/public/funding-rate for the latest settlement frequency, and adjust your trading strategies accordingly.