> For the complete documentation index, see [llms.txt](https://midaswap.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://midaswap.gitbook.io/docs/technical-reference/liquidity-tracking.md).
# Liquidity Tracking
To facilitate query liquidity Midas uses a 3-layer tree structure. Each node is a 256bit array recorded with uint256. There are exactly $$256^3=2^{24}$$ slots at the bottom of the tree, corresponding to the theoretical maximum of $$2^{24}$$ slots in our bin. We record this underlying slot as 1 when there is liquidity in a bin, and label it as 0 otherwise. When a parent node has a 1 in the 256 slots it contains, the parent node is also marked as 1, and so on.
This structure can help us efficiently find the next bin with liquidity in a given direction and update the current floor price and best offer.
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