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CoW Swap vs MEV Blocker

How CoW Swap and MEV Blocker differ on type, protection, rebates and what they’re built for.

CoW SwapMEV Blocker
TypeBatch-auction DEXPrivate RPC
How it worksOrders settle in batches at one uniform clearing price, chosen by competing solvers, with Coincidence-of-Wants matching — removing the ordering advantage MEV bots exploit. Same team as MEV Blocker.Routes your transaction through a searcher auction instead of the public mempool; searchers bid for the right to back-run it and rebate up to 90% of the profit to you automatically.
Protects againstSandwiching/frontrunning via uniform-price batch auctionsFrontrunning & sandwiching on any Ethereum dApp
RebatesPrice surplus returned to youUp to 90% of back-run value, auto-deposited
ChainsEthereum, Gnosis, Arbitrum, BaseEthereum
SetupTrade on CoW SwapAdd RPC rpc.mevblocker.io to your wallet
Best forSpot swaps that want best price + protectionEveryday wallets that want rebates

CoW Swap

  • MEV-protected by design (batch auctions)
  • Coincidence-of-Wants can beat AMM price
  • Gasless limit orders
  • Swaps only, not arbitrary transactions
  • Batch settlement adds some delay

MEV Blocker

  • Largest adoption (4.5M+ wallets)
  • Up to 90% back-run rebates, auto-paid
  • Protects on any dApp once set as RPC
  • Ethereum mainnet only
  • Rebate size depends on searcher competition

Bottom line

Pick CoW Swap for spot swaps that want best price + protection; pick MEV Blocker for everyday wallets that want rebates.