14External exchanges
MediannestedAggregation
Stake-weightedValidator votes
LiveUpdated every block
The inputs
- 14 external exchanges contribute price feeds for each market.
- Each active validator independently observes those feeds.
- The exact list of exchanges is documented on docs.asterdex.com.
The aggregation
- Each validator computes a median across its observed exchange prices.
- The chain takes the validator medians and produces a final mark price weighted by validator stake.
- This nested median structure is robust: a single bad feed or a single malicious validator cannot move the mark price meaningfully.
What the mark price drives
- Liquidation. Your position liquidates when your maintenance margin becomes insufficient at the mark price, not the last trade price.
- Funding. The funding rate on perps tracks the mark price vs the trade price.
- Unrealized PnL. Shown in the UI at the mark price.
RWA and pre-IPO oracles
- For listed RWAs the oracle uses the official market price during trading hours and a reference index during off-hours.
- For pre-IPO markets the oracle uses an aggregated signal (secondary valuations, analyst implied values). The exact methodology is per-market and documented per pair. See RWA Perps.
Why it matters when you trade
- In fast moves, the mark price lags or leads the trade price depending on where most volume sits across the 14 venues.
- You can be liquidated even if AsterDEX's own order book has not printed the liquidation price, because the mark price is calculated externally.
- Conversely, brief wicks on a single venue cannot liquidate you because they are filtered out by the median.
Further reading
Last reviewed May 2026. Numbers drift — check the oracle feed for current values.
Corrections → @aster_scan