CoW Swap

CoW Swap is the trading interface built on CoW Protocol, a decentralized trading protocol launched in 2021 that uses intent-based order submission, batch auction settlement, and solver competition to execute token swaps on Ethereum and supported EVM networks. Rather than routing trades directly through on-chain AMM pools at the moment of submission, CoW Swap collects signed trade intents from users and delivers them to an off-chain order book where competing solvers find optimal execution paths across available liquidity sources. The resulting settlement is submitted on-chain by the winning solver in a batch transaction, with the protocol verifying that the settlement satisfies each order's specified minimum output before accepting it

The COW token is the governance token of the CoW Protocol ecosystem, used by holders to participate in protocol governance through the process described at docs.cow.fi/governance. CoW Swap is accessible at swap.cow.fi, and the underlying CoW Protocol smart contracts are published under the GPL-3.0 open-source license on GitHub at github.com/cowprotocol for independent review. Documentation for users, developers, and integrators is maintained at docs.cow.fi, covering the order submission flow, solver architecture, settlement contract design, and developer API for building on CoW Protocol

The primary user interaction with CoW Swap begins at swap.cow.fi, where traders connect an EVM-compatible wallet, select input and output tokens, and submit a signed trade intent specifying the tokens to trade, the amount, and the minimum acceptable output. Unlike AMM-based DEX interfaces where trades execute immediately against a pool at the current spot price, CoW Swap submits the signed order to the CoW Protocol order book, where it is held until a solver includes it in a batch settlement. The trader does not select routing paths — the solver determines execution and the protocol verifies the settlement satisfies the order's minimum output requirement before the on-chain settlement is accepted

A distinctive feature of CoW Swap's execution model is the possibility of Coincidence of Wants (CoW) matching, where two or more orders in the same batch can be settled peer-to-peer if one trader's desired output matches another's desired input, eliminating the need to route those trades through an on-chain liquidity pool. When a CoW match is possible, the settling solver fills the matched portion of the orders directly between the traders without interacting with any external AMM or liquidity pool, avoiding AMM fees, price impact, and slippage on the matched portion. Unmatched portions of orders in the batch are filled through on-chain liquidity sources — AMM pools, aggregator routes, or other available liquidity — by the solver that wins the batch auction

The intent-based order model of CoW Swap separates the act of expressing a trade from the act of executing it on-chain. When a trader submits an order on swap.cow.fi, they sign an off-chain message encoding their trade parameters — input token, output token, amount, minimum received, and expiry — without broadcasting any on-chain transaction. This signed intent is submitted to the CoW Protocol order book, where it remains available for solvers to include in upcoming batch settlements. The gas cost of settlement is borne by the winning solver rather than the trader, meaning users interact with the protocol by signing an off-chain message rather than paying gas for a swap transaction directly

Batch auction settlement on CoW Protocol groups multiple pending orders and settles them together in a single on-chain transaction at the end of each batch window. Solvers competing to win the right to settle a batch submit solution proposals that route batch orders through available liquidity to satisfy all specified minimum outputs, with the protocol evaluating submitted solutions and selecting the solver that provides the best aggregate execution across the batch. The batch settlement model enables netting of opposing trade directions through CoW matching before routing remaining demand to on-chain liquidity sources, reducing the total volume of trades that must interact with external AMM pools

MEV (Maximal Extractable Value) protection is an architectural property of CoW Swap's off-chain order submission and solver-based settlement design. Because trades submitted through CoW Swap are not broadcast as pending on-chain transactions in the standard mempool, they are not visible to frontrunning bots that monitor pending swap transactions for sandwich opportunities. The solver that wins the batch auction settles all orders in a single atomic transaction, making it structurally more difficult for third parties to insert transactions before or after individual orders to extract value. The GPv2 (Gnosis Protocol v2) settlement contract that underpins CoW Protocol is documented with audit reports available at cowswap.mintlify.app/composable-cow/security/audits

The COW governance token enables token holders to participate in CoW Protocol governance through the documented process at docs.cow.fi/governance, covering decisions on protocol parameters, solver admission criteria, fee structures, and development priorities. CoW Protocol operates as a GPL-3.0 open-source protocol with all core settlement contract implementations available at github.com/cowprotocol, allowing independent review of the GPv2 settlement contract, solver interface definitions, and order relay infrastructure. Governance participation and protocol development are coordinated through the documentation and governance resources at docs.cow.fi, providing a structured path for COW token holders to influence the protocol's direction

CoW Swap supports a range of intent-based trading and MEV-aware execution use cases on Ethereum and supported EVM networks: traders submit signed swap intents through swap.cow.fi to access batch auction settlement without broadcasting pending mempool transactions, reducing exposure to frontrunning and sandwich MEV; DeFi protocols integrate CoW Protocol's order submission API to route user trades through the solver network for MEV protection and potential CoW peer-to-peer matching; developers build integrations using the documented API at docs.cow.fi and the GPL-3.0 open-source contracts at github.com/cowprotocol to submit orders programmatically and query settlement state; COW token holders participate in protocol governance through the process at docs.cow.fi/governance to vote on solver admission, fee parameters, and protocol upgrades; and traders with opposing swap directions benefit from peer-to-peer CoW matching when a solver identifies a matching pair in the same batch

Developer integration with CoW Swap is supported through the documentation at docs.cow.fi, which covers the order submission API, the CoW Protocol settlement contract interface, and the solver architecture for teams building programmatic trading or order management applications. The CoW Protocol repositories on GitHub at github.com/cowprotocol — published under the GPL-3.0 license — include the GPv2 settlement contract, order book relay infrastructure, and solver interface definitions, providing the foundational code for developers integrating order submission, cancellation, or settlement queries into their applications. Developers building on CoW Protocol can submit ERC-20 token swap orders through the order book API, query order status, and monitor settlement outcomes using the endpoints documented at docs.cow.fi

CoW Protocol maintains audit documentation at cowswap.mintlify.app/composable-cow/security/audits, covering the security review history of the GPv2 settlement contract and associated CoW Protocol infrastructure. All CoW Protocol smart contract source code is publicly available on GitHub at github.com/cowprotocol under the GPL-3.0 license, enabling independent inspection of the settlement contract, order validation logic, and solver interface implementations. The off-chain order submission model means that traders' signed intents are not broadcast as pending mempool transactions — orders are relayed to the CoW Protocol order book and settled on-chain only after solver selection, structurally limiting exposure to transaction-level MEV. Users evaluating CoW Swap should review the audit documentation at cowswap.mintlify.app/composable-cow/security/audits, apply standard Web3 wallet security practices before signing order intents at swap.cow.fi, and review the governance documentation at docs.cow.fi/governance before participating in COW token governance

CoW Swap provides an intent-based DEX trading interface on Ethereum and supported EVM networks through CoW Protocol's batch auction settlement architecture — with off-chain order submission, competing solver networks, peer-to-peer Coincidence of Wants matching, and MEV protection through structured batch settlement rather than direct AMM-based on-chain execution. Published audit documentation at cowswap.mintlify.app/composable-cow/security/audits, GPL-3.0 open-source contracts at github.com/cowprotocol, and COW governance through the process at docs.cow.fi/governance give developers, traders, and protocol evaluators structured resources for understanding CoW Protocol's settlement design and security posture. Teams and users evaluating CoW Swap should review the documentation at docs.cow.fi, the audit documentation, and the contract repositories to understand the intent order model, solver competition mechanics, and CoW matching architecture before trading or building integrations on the CoW Protocol