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How Aster delists a perp
Verified against Aster's official docs on 2026-09-29.
Aster can delist a contract for low liquidity or volume, a project shutting down, a major change to the underlying chain such as a hard fork, or "other factors that negatively affect the trading experience." If you hold a position in a small market, the timeline below is the one to know.
The timeline
- Notice, at least 24 hours ahead. Posted on X (Twitter), Telegram and Discord, with the cessation-of-trading date. The docs do not list email or in-app notice, so a day away from those channels can mean missing it.
- Final hour: mark price averaging. The mark price becomes the average of the index sampled every second, "a total of 3,600 data points."
- Final 10 minutes: reduce-only. "No new positions can be opened during this time."
- Delisting. "All remaining open positions are automatically closed at the final Mark Price", unrealized PnL becomes realized, and "trading fees are charged for the automatic settlement."
What that means in practice
Letting a position ride into settlement costs a fee and takes a price you do not choose. Aster's own advice is to "manually close all positions before the cessation of trading." Closing before the last 10 minutes also keeps your full choice of order types.
FAQ
Is a delisted position closed at the last traded price?
No. It settles at the final mark price, the one-hour average of the index.
Can I still open a position after the notice?
The docs restrict only the last 10 minutes to reduce-only orders. Opening a position in a market that is about to close is rarely worth the settlement fee.
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