Important Updates on Mark Price Calculation of TradFi Perpetual Contracts (2026-08-31)

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Fellow Binancians,
Binance constantly reviews its product and service offerings to ensure the best user experience for all users. Effective from 2026-08-31 08:15 (UTC), Binance Futures will make adjustments to mark price calculation of TradFi Perpetual Contracts by updating the basis of Price 2 from 30 seconds basis to 1 minute basis. 
Futures Contracts
Before the Adjustment
After the Adjustment
TradFi Perpetual Contracts
Mark Price = Median (Price 1, Price 2, Contract Price)

 Where Price 2 = Price Index + Moving Average (30 Seconds Basis) 

Note: The Moving Average (30 Seconds Basis) is calculated as the average of 30 data points over a 30 seconds period.

The basis is calculated every second by taking the average of the bid and ask prices and then subtracting the Price Index.
Mark Price = Median (Price 1, Price 2, Contract Price) 

Where Price 2 = Price Index + Moving Average (1-Minute Basis) 

Note: The Moving Average (1-Minute Basis) is calculated as the average of 60 data points over a 1-minute period.

The basis is calculated every second by taking the average of the bid and ask prices and then subtracting the Price Index.
The moving average basis of Price 2 of non-TradFi Perpetual Contracts remains unchanged at a 30 seconds basis.

Notes:
There may be discrepancies between this original content in English and any translated versions. Please refer to the original English version for the most accurate information, in case any discrepancies arise.
For More Information:Perpetual Futures on Traditional Assets
What Are Mark Price and Price Index in USDⓈ-Margined Futures
Mark Price and Price Index of COIN-Margined Contracts
Thank you for your support!
Binance Team
2026-08-28

Futures Contracts	Before the Adjustment	After the Adjustment
TradFi Perpetual Contracts	Mark Price = Median (Price 1, Price 2, Contract Price) Where Price 2 = Price Index + Moving Average (30 Seconds Basis) Note: The Moving Average (30 Seconds Basis) is calculated as the average of 30 data points over a 30 seconds period. The basis is calculated every second by taking the average of the bid and ask prices and then subtracting the Price Index.	Mark Price = Median (Price 1, Price 2, Contract Price) Where Price 2 = Price Index + Moving Average (1-Minute Basis) Note: The Moving Average (1-Minute Basis) is calculated as the average of 60 data points over a 1-minute period. The basis is calculated every second by taking the average of the bid and ask prices and then subtracting the Price Index.