CoW Protocol Upgrades to Fair Combinatorial Auction (FCA)

🐮 Batch Auctions Just Got Smarter

By CoW DAO
May 29, 2025, 3:15 PM
CoW DAOTwitter

CoW Protocol is transitioning from single Batch Auctions to Fair Combinatorial Auction (FCA), launching June 3, 2025.​ The upgrade enables:

  • Multiple solution submissions per auction
  • Better price fairness and lower slippage
  • Increased order fill rates
  • Enhanced MEV resistance
  • ~25% higher solver rewards

Testing begins May 20.​ The new mechanism allows both individual and bundled batch bids, creating more execution paths and fairer pricing for traders.​

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It's official: CoW Protocol is officially moving from single Batch Auctions to a new core mechanism: the Fair Combinatorial Auction (FCA). This is one of the biggest changes in how trades are settled on-chain - and it's great news for users. Here's why 🐮✨

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