# Self-trade prevention Trades between the same address cancel the resting order instead of causing a fill. No fees are deducted, nor does the the cancel show up in the trade feed. On CEXs this behavior is often labeled as "expire maker." This is a commonly preferred behavior for market making algorithms, where the aggressing order would like to continue getting fills against liquidity behind the maker order up until the limit price. --- # 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://hyperliquid.gitbook.io/hyperliquid-docs/trading/self-trade-prevention.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.