To enhance market liquidity and improve index stability across leverage, futures, and perpetual swap products, a leading digital asset exchange has announced adjustments to the composition rules for the STX/USD and STX/USDT indices. These changes are designed to better manage market risks and provide a more reliable pricing mechanism for traders.
The update is scheduled to take effect between 15:00 and 17:00 (UTC+8) on March 22, 2023. During this maintenance window, the system will transition to the new index calculation method.
Detailed Changes to the STX Index Composition
The primary adjustment involves replacing one of the constituent exchanges within the index calculation. Specifically, Coinbase (with its STX/USD trading pair) has been removed and replaced by Kraken (using its STX/USD pair). The weight allocation for this component remains unchanged at 20%.
The following table outlines the adjustments for both indices:
STX/USD Index Adjustments
| Constituent Exchange | Trading Pair | Weight |
|---|---|---|
| Binance | STX/USDT | 20% |
| OKX | STX/USDT | 20% |
| Kucoin | STX/USDT | 20% |
| Gate | STX/USDT | 20% |
| Kraken | STX/USD | 20% |
STX/USDT Index Adjustments
| Constituent Exchange | Trading Pair | Weight |
|---|---|---|
| Binance | STX/USDT | 20% |
| OKX | STX/USDT | 20% |
| Kucoin | STX/USDT | 20% |
| Gate | STX/USDT | 20% |
| Kraken | STX/USD | 20% |
It is important to note that the removal of an old constituent exchange and the inclusion of a new one will be fully effective within 60 minutes of the maintenance period commencing.
How the Index Price is Calculated
The methodology for determining the index price involves a multi-step process to ensure accuracy and fairness:
- Data Collection: The system continuously gathers the latest transaction prices and trading volumes for the specified trading pairs from all constituent exchanges.
- Validity Check: If an exchange is under maintenance or its price/volume data has not been updated for a significant period, its data is considered invalid and excluded from the current calculation cycle.
- Currency Conversion: For any constituent exchange where the quote currency of the trading pair differs from the index's base currency (e.g., a STX/USDT pair is used for a STX/USD index), a conversion is necessary. This is done using relevant baseline indices like BTC/USDT, BTC/USD, USDC/USD, or USDT/USD to convert the price to the index's designated currency.
Weighted Calculation: The final index price is derived based on the number of valid data points remaining:
- 3 or More Valid Exchanges: The prices are weighted equally. However, a sanity check is applied: if a particular exchange's price deviates by more than 3% from the median of all gathered prices, its price is adjusted to be the median multiplied by either 0.97 or 1.03 before being included in the average.
- 2 Valid Exchanges: The prices from the two exchanges are simply averaged with equal weight.
- 1 Valid Exchange: The price from the sole remaining valid exchange is used directly as the index price.
Important Risk Advisory for Traders
Periods of significant market volatility, coupled with changes to index rules, can lead to sudden jumps in an index's mark price. This mark price is critical as it is used to determine the liquidation price for positions in leverage trading and perpetual contracts.
Following this update, the maintenance margin ratio for some user positions might increase due to adjustments in the tiered margin system. To proactively mitigate the risk of unintended forced liquidation, traders are strongly advised to manage their risk exposure.
You can effectively lower your leverage and protect your positions by:
- Partially or fully closing existing positions.
- Reducing the size of your positions.
- Adding more collateral (margin) to your account.
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Staying informed about platform updates and understanding how they affect your trading strategy is a key component of successful risk management.
Frequently Asked Questions
Q: What exact time will the new STX index rules be active?
A: The transition is scheduled for the two-hour window between 15:00 and 17:00 (UTC+8) on March 22, 2023. The new constituent (Kraken) will be fully integrated within 60 minutes of the start of this period.
Q: Why was the STX index composition changed?
A: The adjustment aims to improve the overall stability and reliability of the STX index price. By carefully selecting constituent exchanges, the platform enhances liquidity and provides a more robust defense against market manipulation and anomalous pricing events.
Q: How does this change affect my existing STX leverage or futures positions?
A: The update could cause a momentary shift in the mark price, which might impact your position's maintenance margin requirement and liquidation price. It is highly recommended to check your positions and adjust your leverage or margin accordingly before and after the update to avoid unnecessary risk.
Q: What happens if one of the constituent exchanges goes offline during the price calculation?
A: The system's methodology accounts for this. If an exchange's data is stale or unavailable, it is deemed invalid and excluded from that specific calculation cycle. The index price is then derived from the remaining valid data sources using the rules outlined above.
Q: Is the weight of each exchange in the index the same?
A: Yes, in this specific configuration for STX, all constituent exchanges are given equal weight (20% each) in the calculation of the final index price.
Q: Where can I learn more about how mark prices work?
A: Mark prices are a common mechanism used in derivative trading to prevent unfair liquidations caused by short-term market volatility on a single exchange. They are typically calculated based on a spot index price and a decaying funding rate basis.