34 lines
1.1 KiB
Markdown
34 lines
1.1 KiB
Markdown
> ## Documentation Index
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> Fetch the complete documentation index at: https://docs.polymarket.com/llms.txt
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> Use this file to discover all available pages before exploring further.
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# Index Price
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> How the Index Price is computed for Perps
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Index Price is Polymarket's estimate of the underlying asset's fair value. It is
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computed from external price feeds, aggregated to resist stale or anomalous
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inputs, and published every 200 milliseconds per market.
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## Feed Sources
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Index Price can use feeds from external sources such as:
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* Pyth
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* Chainlink Data Streams
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* Hyperliquid
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## Feed Selection
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The system selects different feeds based on the current market session so it can
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use the most accurate feed set for each market. See [Market Sessions](/perps/learn-about-trading/market-sessions).
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## Aggregation
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Index Price is computed as a weighted average across the selected feeds after
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dropping stale prices and filtering outliers. This prevents any single stale or
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anomalous feed from moving the Index.
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The same aggregation approach is used to build the [C3 candidate in Mark Price](/perps/learn-about-trading/mark-price),
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using a separate mark feed set.
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