Uniswap

Uniswap is an open-source decentralized exchange protocol launched in 2018 on Ethereum, providing non-custodial infrastructure for token swaps and liquidity provision through an automated market maker model. Unlike order book exchanges that require buy and sell orders to be matched between counterparties, Uniswap pools operate on a constant product formula — x * y = k — where the ratio of two ERC-20 tokens in a pool determines the exchange price at execution time. The protocol has evolved through multiple versions, with Uniswap v4 introducing a hook system that allows developers to attach custom logic to pool lifecycle events

Uniswap operates across multiple EVM-compatible networks including Ethereum mainnet, Polygon, Arbitrum, Optimism, Base, and other supported chains, making it applicable for users and liquidity providers across a broad set of EVM ecosystems. The UNI governance token gives holders the ability to participate in protocol governance decisions including fee parameter changes, treasury allocations, and protocol upgrades through on-chain voting. Uniswap Labs maintains the main trading interface at app.uniswap.org and the open-source repositories under the Uniswap GitHub organization, while the underlying protocol contracts are independently deployable by developers

The primary user experience on Uniswap begins with the trading interface at app.uniswap.org, where users connect an EVM-compatible wallet, select an input token and an output token, and receive a quoted swap rate drawn from available liquidity across connected pools on the selected network. The interface evaluates available liquidity paths and presents an execution quote including the expected output amount, the effective exchange rate, the applicable pool fee tier, and a price impact estimate for the specified trade size. Trades are executed directly on-chain through the Uniswap protocol smart contracts without custodial transfer of funds to an intermediary

Liquidity provision on Uniswap allows participants to deposit pairs of ERC-20 tokens into AMM pools and earn a proportional share of the trading fees collected on swaps routed through the pool. Uniswap v3 introduced concentrated liquidity, where liquidity providers specify a price range within which their capital is active — enabling more capital-efficient positioning compared to the full-range liquidity model of earlier protocol versions. The Uniswap interface and the protocol's open-source contract layer support all active protocol versions, allowing users to interact with v2, v3, and v4 deployments depending on available pool configurations

Uniswap's core swap mechanism operates through the AMM model, where token price is determined algorithmically by the ratio of reserves held in each liquidity pool rather than through an order book. The constant product invariant — x * y = k — governs each swap by adjusting the reserve ratio after every trade, with the price impact of a given trade scaling with its size relative to the pool's total reserves. This model allows Uniswap to price and execute token swaps for any ERC-20 token pair that has an active liquidity pool without requiring counterparty matching or manual price setting by a market maker

Concentrated liquidity, introduced in Uniswap v3, allows liquidity providers to specify the price range within which their deposited tokens provide active trading liquidity. Rather than spreading capital uniformly across all possible prices as in the constant product model, providers deploy capital that is utilized only when the pool price falls within the selected range, potentially increasing the fee yield per unit of capital for positions concentrated around the prevailing price. This range selection gives liquidity providers control over the trade-off between concentrated return potential and the risk of having their position fall outside an active trading range

Uniswap v4 introduces a hook architecture that allows developers to deploy smart contracts — called hooks — that execute custom logic at defined points in the pool lifecycle, including before and after swap execution, before and after liquidity changes, and at pool initialization. This system enables on-chain integrations such as dynamic fee adjustment based on volatility, custom oracle implementations attached directly to pool contracts, and liquidity incentive programs deployed as pool-level hooks without requiring a separate protocol layer. The v4 core contract repository is publicly available at github.com/Uniswap/v4-core for developers building hook contracts or integrating with the v4 protocol

UNI is the governance token of the Uniswap protocol, giving holders the ability to propose and vote on protocol-level changes through on-chain governance processes. Governance decisions can include updates to fee tier structures, allocations from the Uniswap DAO treasury, and changes to smart contract parameters across supported deployments. All governance activity is conducted through on-chain proposal and voting mechanisms, meaning that protocol changes require UNI-weighted approval before implementation and the full governance history is transparently verifiable on-chain by any external observer

Uniswap supports a broad range of DeFi and on-chain trading use cases across its supported networks: retail users swap ERC-20 tokens at AMM-determined prices without using a centralized exchange or custodial account; DeFi protocols integrate Uniswap pools as a liquidity source for internal token conversion, treasury management, or on-chain price reference; liquidity providers deploy capital to fee-generating AMM pools and configure concentrated liquidity positions to earn trading fee revenue on targeted price ranges; developers building trading applications, yield strategies, or DeFi aggregators use the Uniswap SDK and contract ABIs to route swaps programmatically through the protocol; and UNI token holders participate in on-chain governance to influence protocol parameters, fee structures, and treasury decisions

Developer integration with Uniswap is supported through the documentation at docs.uniswap.org, the Uniswap SDK for JavaScript and TypeScript, the open-source smart contract repositories at github.com/Uniswap, and the v4 core repository at github.com/Uniswap/v4-core for teams building on the hook architecture. The interface repository at github.com/Uniswap/interface is also publicly available for developers who want to inspect the front-end implementation or build on top of the existing interface patterns. Developers building protocol integrations can interact directly with the deployed Uniswap router contracts on-chain using the published ABIs, querying pool state, constructing swap transactions, and executing multi-hop routes across token pairs without relying on a centralized API endpoint

Uniswap protocol smart contracts have undergone independent security audits across protocol versions, and all contract source code is publicly available and independently verifiable on GitHub under the Uniswap organization. An active bug bounty program is maintained at uniswap.org/bug-bounty, providing a structured and incentivized channel for responsible vulnerability disclosure by external security researchers. As a non-custodial protocol, Uniswap contracts do not hold user funds between transactions — assets are transferred atomically within each swap or liquidity operation. Users and integrators should consult the documentation, review available audit summaries, and apply risk assessment appropriate to their level of interaction with on-chain AMM protocols

Uniswap provides open-source AMM infrastructure for token swaps, liquidity provision, and on-chain trading across multiple EVM-compatible networks, operating on Ethereum since 2018. The introduction of concentrated liquidity in v3 and the hook architecture in v4 represent significant protocol-level developments that expand what builders can construct on top of the Uniswap AMM infrastructure. Teams and users evaluating Uniswap should review the developer documentation at docs.uniswap.org, the open-source contract repositories on GitHub, and the bug bounty program to assess the protocol's security posture and integration options against their specific trading, liquidity, or development requirements