> For the complete documentation index, see [llms.txt](https://hyperliquid.gitbook.io/hyperliquid-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hyperliquid.gitbook.io/hyperliquid-docs/trading/self-trade-prevention.md).

# 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.