# Buy Collateral **This function allows any account to use the base token to buy collateral from the protocol at a price below the feed price. A minimum collateral amount should be specified to indicate the maximum slippage acceptable to the buyer.** **This function can also be used after the account is liquidated and there is collateral available for purchase. Doing so increases the protocol reserve. The amount of available collateral can be found by calling the Collateral Balance function. The price of collateral can be determined using the quoteCollateral function.** --- # 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://lenen-protocol.gitbook.io/lenen-protocol/proper-indicator/buy-collateral.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.