# Avoid Unlimited ERC-20 Approvals Approving the maximum value of uint256 is a known practice to save gas. However, this pattern was proven to increase the impact of an attack many times in the past, in case the approved contract gets hacked. Consider approving the exact amount that’s needed to be transferred, or alternatively, add a permissioned function that allows the revocation of unlimited approvals in an emergency case. --- # 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.optimumsec.xyz/coding/avoid-unlimited-erc20-approvals.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.