CoW Swap is the first user interface built on top of the permissionless, open source CoW Protocol, blending a familiar Uniswap-style UI with advanced off-chain batch auctions that protect traders from front-running and MEV attacks by aggregating signed “trade intents” and matching them via a decentralized solver network, which competes to find the optimal execution path and returns any price improvement (surplus) directly to users; it supports market swaps, limit orders, TWAP orders, native token trades, and flash loans across Ethereum, Polygon, and Avalanche, all without routing transactions through a public mempool or requiring on-chain approvals, since gasless approvals and off-chain order cancellations dramatically reduce gas costs. Setup takes minutes, just connect any EIP-1193 wallet such as MetaMask, Rabby, or Trust Wallet, multisig wallets like Safe (including via WalletConnect v2), or hardware wallets like Trezor, and you’re ready to trade.