Index Price, Fair Price, and Last Price
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1. What Is Index Price?
The index price is the weighted average of the underlying asset's price across major spot exchanges. As the price of the underlying asset changes, the index price is continuously updated to reflect the fair market value of the futures pair. MEXC selects prices from major exchanges as the source of each Futures index, ensuring that the pricing of its Futures is based on real-time market data.
The purpose of setting the index price is to reduce the risk caused by price volatility and market manipulation, providing a more stable price reference.
Calculation Method:
Index Price = (Weight Percent of Exchange A × Price of the Underlying Asset on Exchange A + Weight Percent of Exchange B × Price of the Underlying Asset on Exchange B + ... + Weight Percent of Exchange N × Price of the Underlying Asset on Exchange N)
- Weighted Percent of Exchange i = Weight of Exchange i / Total Weight
- Total Weight = Weight of Exchange A + Weight of Exchange B + ... + Weight of Exchange N
MEXC will periodically update the index components and weights. If extreme market conditions or abnormal price deviations occur, MEXC will take additional protective measures, including but not limited to changing the index components and weights without prior notice.
Note:
If a certain exchange's market data is consistently delayed or significantly deviates from the market, its price data will be excluded from the index calculation. Once the data quality from the excluded exchange returns to normal, it will be reintegrated into the calculation.
If the spot price of a particular exchange deviates from the median of all exchanges by ±3%, MEXC will implement a price protection mechanism and exclude the spot price from that exchange (under extreme market conditions, the platform may adjust the median deviation coefficient for certain trading pairs or not be bound by this arrangement).
2. What Is Fair Price?
The fair price is calculated based on the index price and the cost basis moving average.
To improve market stability and reduce liquidation risk during abnormal market fluctuations, MEXC Perpetual Futures uses a specially designed fair price marking system. Instead of using the last price, the system sets the mark price to the fair price. This helps prevent unnecessary deviations between the market price and the price index caused by market manipulation or lack of liquidity, thereby avoiding unnecessary liquidation.
On the MEXC Futures trading page, you can view the fair price on the right side of the trading pair. Alternatively, you can set the candlestick chart to display the fair price at the top of the chart.
Calculation Method:
Fair Price = Median (Funding Rate Premium, Mid-Price Basis Fair Price, Last Price)
- Funding Rate Premium = Index Price × (1 + Latest Funding Rate × (Hours Until Next Funding Settlement / Funding Settlement Period in Hours))
- Mid-Price Basis Fair Price = Index Price + Moving Average of Basis (specified period) = Index Price + Moving Average [(Best Bid Price + Best Ask Price) / 2 - Index Price]
- Last Price is the most recent Futures transaction price, updated in real-time.
Note:
The fair price only affects the liquidation price and unrealized PNL, it does not affect realized PNL.
This means that when user orders are executed, they may see positive or negative unrealized profit and loss immediately. This happens due to a slight deviation between the fair price and the last price. This is a normal phenomenon and does not mean that users have lost funds, but users must pay attention to the liquidation price to mitigate the risk of liquidation.
3. What Is Last Price?
The last price refers to the price at which Futures pairs are instantly traded in the MEXC order book.
You can view this price by clicking on the Market Trades tab in the order book area on the MEXC Futures trading page.
4. How to Switch Between Index Price, Fair Price, and Last Price on MEXC
4.1 Website
Open the Futurestrading page on MEXC. Hover your mouse over Last Price ▼, Index Price ▼, or Fair Price ▼ above the candlestick chart, and a dropdown menu with three price options will appear. Click to select the price you want to use to switch between them.
4.2 App
1) Open the MEXC App and tap Futures at the bottom.
2) On the Futures trading page, tap the candlestick icon in the top right corner.
3) On the candlestick chart page, tap the screen rotation icon at the top right.
4) In the horizontal candlestick chart view, tap Last Price ▼, Index Price ▼, or Fair Price ▼ in the top right corner, and a dropdown menu with three price options will appear. Tap to select the price you want to use to switch between them.
Disclaimer: This information does not provide advice on investment, taxation, legal, financial, accounting, consultation, or any other related services, nor does it constitute advice to purchase, sell, or hold any assets. MEXC Learn provides information for reference purposes only and does not constitute investment advice. Please ensure you fully understand the risks involved and exercise caution when investing. The platform is not responsible for users' investment decisions.