# MARKET DATA & CHARTS

This section describes how PaperMarket works with Polymarket data under the hood.

Here the focus is on the data layer

* how the app reads order books and prices from Polymarket
* how it builds price history for charts
* how real time updates are streamed into the interface
* how these data sources are used to value positions and calculate PnL

The goal is to make clear which parts of the information come directly from Polymarket APIs and which parts are derived inside PaperMarket before they appear in the UI.


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