# Index Price The Index Price refers to the price of the underlying asset in the spot market. It is an aggregate price based on data from multiple exchanges and Pyth. The index price is calculated every second. The exchanges used for aggregation include: Coinbase, Binance, OKX Oracle Protocol: Pyth Network For BTC-denominated currency pairs, the system multiplies the OKX BTC-USD index to convert to the US dollar price. To ensure that index fluctuations remain within a normal range, the system invalidates exchanges where the latest transaction price or trade volume has not been updated for a specific time. If an exchange price deviates by more than 3% from the median price of all exchanges, it will be adjusted to either median \* 0.97 or median \* 1.03. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.satori.finance/perpetual-trading/index-price.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.