> For the complete documentation index, see [llms.txt](https://deluthium.gitbook.io/tutorial/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://deluthium.gitbook.io/tutorial/core-technology/cpo-foam-fair-ordering-mechanism.md).

# CPO-FOAM: Fair Ordering Mechanism

**CPO-FOAM (*****Conditional Price Ordering with Fair Ordering and Allocation Mechanism*****)** is the ordering and matching protocol native to Deluthium's execution engine.

Standard blockchain transaction ordering creates a race condition. MEV searchers and high-frequency bots compete on gas price or latency to front-run other participants. CPO-FOAM replaces this race with a price-priority system. Orders are evaluated based on price quality and allocated according to deterministic fairness rules.

This mechanism ensures that no participant, regardless of their infrastructure or capital, can gain execution priority through gas bidding. The result is a structurally fair execution environment where the best price wins, not the fastest bot.