> For the complete documentation index, see [llms.txt](https://docs.synfutures.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.synfutures.com/perp-trading/security/smoothed-spot-index-price.md).
# Smoothed Spot Index Price
The raw spot price fetched from the underlying oracle **is not used directly but undergoes a specific exponential moving average (EMA) method to smooth the fluctuation.** This ensures that the spot index price cannot be easily **manipulated for the market's stability,** as the fluctuation directly impacts mark price, which determines the safety of all positions.
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