# Definition of Pool Types In NFT AMMs Collection.xyz has three types of pools, **TOKEN**, **NFT** and **TRADE** pools. TOKEN/NFT are what we call limit-type pools. Once they trade one way, they do not trade the other way. For example, a TOKEN pool may have a bid for an NFT, but after it buys the NFT, it does not sell it again. This is unlike the two-sided TRADE pool, which will buy and sell within the pool’s liquidity range. You can think of them as price ladders, with the prices parameterized by pool’s bonding curve and liquidity. The difference between TOKEN and NFT pools are mainly the type of liquidity in the pool. If we think of TOKEN-NFT pair as TOKENs being the bid liquidity, and NFTs as ask liquidity, then TOKEN pools have bid liquidity and NFT pools have ask liquidity --- # 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.collection.xyz/guides/technical-reference/pool-types/definition-of-pool-types-in-nft-amms.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.