# Delistings

To maintain a healthy trading environment, Aster may delist certain perpetual futures contracts based on factors such as low liquidity or low trading volume. The delisting process is designed to be transparent and timely.

### **Reasons for Delisting**

A futures contract may be delisted due to one or more of the following:

* Low liquidity or trading volume
* Project operations cease
* Major changes to the underlying blockchain (e.g., a hard fork)
* Other factors that negatively affect the trading experience

### **Delisting Process**

**Announcement**

A delisting notice will be issued on [Twitter](https://twitter.com/asterdex), [Telegram](https://t.me/asterdex), and [Discord](https://discord.gg/asterdex) at least 24 hours in advance. The announcement will include the cessation of trading date and any relevant instructions.

**Reduce-Only Window**

Starting 10 minutes before the cessation of trading, only reduce-only orders can be placed for the affected contract. No new positions can be opened during this time.

**Final Mark Price Calculation**

During the last hour before trading stops, the Mark Price of the delisted contract is calculated as the average of the price index sampled every second — a total of 3,600 data points.

**Trading Halt and Settlement**

At the time of delisting:

* All remaining open positions are automatically closed at the final Mark Price.
* Trading fees are charged for the automatic settlement.
* All unrealized PnL is settled and converted into realized PnL.

### **After Delisting**

* The delisted contract will no longer be available for trading.
* Historical data may remain available for reference.

### **Recommendations**

To avoid automatic settlement and additional fees, traders are strongly advised to manually close all positions before the cessation of trading.


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