Matching Algorithm

A matching algorithm is the logical set of rules programmed into an exchange's engine to determine how orders are paired. Beyond simple FIFO, these algorithms can include pro-rata matching, where volume is distributed among multiple participants at the same price.

The algorithm must handle complex scenarios like partial fills, order cancellations, and price updates simultaneously. It is designed to be deterministic, meaning the same inputs will always yield the same result, ensuring fairness.

Developers test these algorithms rigorously to prevent bugs that could lead to erroneous trades or systemic issues. The choice of algorithm significantly impacts how liquidity providers behave and how the market settles.

It is the foundation of trust in any centralized or decentralized exchange platform.