CoW Protocol will shift to a fair combination auction mechanism, starting testing on May 20, with a full launch expected around June 3, 2025, across all chains. FCA is a form of auction that allows order matchers to submit multiple solutions, including: individual order bids and bundled batch bids, enabling the CoW protocol to evaluate more execution paths. For users, FCA will increase the number of orders completed in each auction, reduce Slippage, and enhance MEV resistance; for order matchers, FCA introduces a new rewards logic, with expected rewards increasing by about 25%.
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