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Binance announced updates to its funding rate formula and mark price calculations for USDⓈ-M and COIN-M futures on September 18, 2025. The changes refine funding intervals and reduce the mark price moving average from one minute to 30 seconds.
According to Binance’s press release, the update aims to improve liquidity, transparency, and trading efficiency across perpetual and delivery futures markets. Funding rates are crucial in maintaining price convergence between futures contracts and their underlying spot markets. Inaccurate calculations can distort trader behavior. By refining both the funding rate formula and mark price basis, Binance seeks to minimize pricing anomalies and protect users from unnecessary liquidation risks.
The new funding rate formula introduces a scaling factor, dividing calculations by (8/N) where N is the funding interval, instead of applying a flat formula across all contracts. For example, PUMPUSDT, which has a 4-hour funding interval, will now calculate rates as [Average Premium Index + clamp(0.01% - Premium Index, 0.05%, -0.05%)] / 2. This ensures that funding costs remain proportional and fair across assets with varying intervals while maintaining exceptions such as BNBUSDT and ETHBTC, which continue to carry a 0% interest rate.
