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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.

The details are as follows: Features Details Underlying KAT/USDT index Settlement crypto USDT Face value 100 Price quotation 1 KAT value calculated in USDT equivalent Tick size 0.00001 Leverage 0.01-20x Funding rate clamp [Average premium index + clamp (Interest rate – Average premium index, 0.05%, -0.05%), 1.50%, -1.50%] For average premium index and interest rate calculations, refer to our product documentation Funding interval 4 hours Trading hours 24/7 Tiered position limits Tier Max open positions

The details are as follows: Features Details Underlying ZAMA/USDT index Settlement crypto USDT Face value 10 Price quotation 1 ZAMA value calculated in USDT equivalent Tick size 0.00001 Leverage 0.01-20x Funding rate clamp [Average premium index + clamp (Interest rate – Average premium index, 0.05%, -0.05%), 1.50%, -1.50%] For average premium index and interest rate calculations, refer to our product documentation Funding interval 4 hours Trading hours 24/7 Tiered position limits Tier Max open positions

The details are as follows: Features Details Underlying FOGO/USDT index Settlement crypto USDT Face value 10 Price quotation 1 FOGO value calculated in USDT equivalent Tick size 0.00001 Leverage 0.01-20x Funding rate clamp [Average premium index + clamp (Interest rate – Average premium index, 0.05%, -0.05%), 1.50%, -1.50%] For average premium index and interest rate calculations, refer to our product documentation Funding interval 4 hours Trading hours 24/7 Tiered position limits Tier Max open positions

The details are as follows: Features Details Underlying BREV/USDT index Settlement crypto USDT Face value 1 Price quotation 1 BREV value calculated in USDT equivalent Tick size 0.0001 Leverage 0.01-20x Funding rate clamp [Average premium index + clamp (Interest rate – Average premium index, 0.05%, -0.05%), 1.50%, -1.50%] For average premium index and interest rate calculations, refer to our product documentation Funding interval 4 hours Trading hours 24/7 Tiered position limits Tier Max open positions

The details are as follows: Features Details Underlying MET/USDT index Settlement crypto USDT Face value 1 Price quotation 1 MET value calculated in USDT equivalent Tick size 0.0001 Leverage 0.01-20x Funding rate clamp [Average premium index + clamp (Interest rate – Average premium index, 0.05%, -0.05%), 1.50%, -1.50%] For average premium index and interest rate calculations, refer to our product documentation Funding interval 4 hours Trading hours 24/7 Tiered position limits Tier Max open positions

The details are as follows: Features Details Underlying YB/USDT index Settlement crypto USDT Face value 1 Price quotation 1 YB value calculated in USDT equivalent Tick size 0.0001 Leverage 0.01-50x Funding rate clamp [Average premium index + clamp (Interest rate – Average premium index, 0.05%, -0.05%), 1.50%, -1.50%] For average premium index and interest rate calculations, refer to our product documentation Funding interval 4 hours Trading hours 24/7 Tiered position limits Tier Max open positions

, Index × (1 – Y) + Avg premium in the last 2 mins), Index × (1 – Z)] OKX may adjust the parameters J, X, Y, Z or switch limit price calculation methods based on market conditions without prior notice.

, Index × (1 – Y) + Avg premium in the last 2 mins), Index × (1 – Z)] OKX may adjust the parameters J, X, Y, Z or switch limit price calculation methods based on market conditions without prior notice.

Price limit rules: During Pre-open session and continuous trading, index-based limit rules will be applied.Index-based limit calculation rules: Phase Maximum bid price Minimum ask price During Pre-Open session Index × (1 + J) Index × (1 – J) Within the 10 minutes of continuous trading Index × (1 + X) Index × (1 – X) After the first 10 minutes of continuous trading Min[Max(Index, Index (1 + Y) + Avg premium in the last 2 mins), Index × (1 + Z)] Max[Min(Index, Index × (1 – Y) + Avg premium in the last

, Index × (1 – Y) + Avg premium in the last 2 mins), Index × (1 – Z)] OKX may adjust the parameters J, X, Y, Z or switch limit price calculation methods based on market conditions without prior notice.

, Index × (1 – Y) + Avg premium in the last 2 mins), Index × (1 – Z)] OKX may adjust the parameters J, X, Y, Z or switch limit price calculation methods based on market conditions without prior notice.

Index-based limit calculation rules: Phase Maximum bid price Minimum ask price During Pre-Open session Index × (1 + J) Index × (1 – J) Within the 10 minutes of continuous trading Index × (1 + X) Index × (1 – X) After the first 10 minutes of continuous trading Min[Max(Index, Index (1 + Y) + Avg premium in the last 2 mins), Index × (1 + Z)] Max[Min(Index, Index × (1 – Y) + Avg premium in the last 2 mins), Index × (1 – Z)] OKX may adjust the parameters J, X, Y, Z or switch limit price calculation methods

in the last 2 mins), Index × (1 + Z)] Max[Min(Index, Index × (1 – Y) + Avg premium in the last 2 mins), Index × (1 – Z)] OKX may adjust the parameters N, H, X, Y, Z or switch limit price calculation methods based on market conditions without prior notice.