BingX will **continuously introduce data from multiple exchanges into the "Latest Index" of Perpetual Futures to improve the stability of the latest index price as well as to reduce index price deviations. **The major exchanges include Binance, FTX, Gate.io, OKX, MEXC, and more. BingX will add new exchanges to or remove existing exchanges from its reference list depending on actual conditions.

Notes:

- If there are multiple pairs of the same underlying asset on the same exchange, only one of them will be adopted, with priority given to the USDT-margined pair, and if there is no USDT-margined pair, the USDC- or USD-margined pair will be adopted.
- The price calculation weights of each external exchange are the same.
- If the data of an external exchange is returned more than 5s earlier/later than the current system time, the exchange will be ignored in this calculation.
- Each time the price index is updated, the Mark Price is also updated.
- When the deviation between the last price of an external exchange and the median of all the above exchanges’ price is ≥ 3%, that external exchange will not be included in the Price Index Calculation for the next 5 minutes. | After 5 minutes the system will check the price of that exchange again and if the price deviation returns to the normal level, that exchange will be re-included in the price index calculation, and if not, it will not be included. | In case of non-inclusion in the calculation of the price index for 4 consecutive times within 30 minutes, it is considered that the price deviation of that exchange is too large and the system will no longer evaluate the conditions for restoration; instead, a manual review is required to determine whether the exchange will be included in the calculation of the price index or not.

Example:

Take the index price of BTC/USDT as an example to calculate.

Assume the latest BTC prices of Binance, OKEx, Coinbase, Bitstamp, Bittrex, Gate, MXC, and Kraken are P1~P9 respectively.

- P1~P9, sorted by smallest to largest to take the median. Name Pmedian, assuming Pmedian=P5
- Calculate |Px/Pmedian-1|, if the result is greater than 3%, then eliminate Px
- The retained Px are reassigned equal weights, assuming that the final retention is (P1, P3 ~ P8), a total of seven, then Weight = 1/7
- Index Price "PIndex" = P1 * Weight + P3 * Weight + ... + P8 * Weight

So, the index price of BTC/USDT is PIndex.

BingX reserves the right in its sole discretion to amend or change or cancel this announcement at any time and for any reason without prior notice.