Uniswap Explained: V1, V2, V3, V4 Hooks, and UNI Token (2026)

TL;DR

• Uniswap is the largest decentralized exchange in crypto, launched November 2018 by Hayden Adams. By April 2026 it has cumulatively settled more than $3 trillion in trade volume across four major versions, runs on 30+ chains, and is governed by holders of the UNI token through the Uniswap DAO and Uniswap Foundation.
• Uniswap v4 shipped January 2025 with hooks — pluggable smart contracts that run around swaps to enable dynamic fees, on-chain limit orders, MEV recapture, custom oracles and entirely new AMM curves. UniswapX (intent-based RFQ) and Unichain (Uniswap Labs' OP Stack L2 launched October 2024) extend the protocol off the host chain.
• The UNIfication vote of December 26, 2025 finally activated the long-debated protocol fee switch on selected v2 and v3 Ethereum-mainnet pools and committed Uniswap Labs to burn 100 million UNI — ending seven years of debate over whether UNI is a real cash-flow asset or a pure governance token.
• Despite intense competition from Curve, Balancer, PancakeSwap, Aerodrome, Raydium and Jupiter, Uniswap remains the reference DEX of Ethereum and Base, with no successful exploit of its core contracts in eight years and a permissionless, ecosystem-wide hook market emerging on top of v4.

Table of contents

• What is Uniswap? (definition)
• Who founded Uniswap?
• Uniswap timeline 2017-2026
• How Uniswap works (technical mechanics)
• Uniswap V1 (Nov 2018)
• Uniswap V2 (May 2020)
• Uniswap V3 (May 2021): concentrated liquidity
• Uniswap V4 (Jan 2025): hooks
• UniswapX (intent-based routing)
• Unichain: the DeFi-native Layer 2
• The UNI token, governance and UNIfication
• 30+ chains: where Uniswap runs
• Fee tiers, NFT positions and LP mechanics
• The hooks ecosystem: what's being built on V4
• Uniswap V4 use cases
• Uniswap vs Curve, Balancer, PancakeSwap, Aerodrome
• TVL, volume and market data in 2026
• Hack and exploit history
• Risks and criticism
• How to use Uniswap (step-by-step)
• Research and reports
• FAQ
• Glossary

What is Uniswap? (definition)

Uniswap is the leading decentralized exchange (DEX) on Ethereum and most EVM-compatible Layer 2 networks. It is a set of audited, open-source smart contracts that let any wallet swap one ERC-20 token for another without an account, an order book, a market maker, a broker or any centralized intermediary. Where a traditional exchange like the NYSE or Binance matches buy and sell orders through an order book, Uniswap prices trades algorithmically against pooled liquidity supplied by ordinary users called liquidity providers (LPs).

The protocol pioneered the automated market maker (AMM) model in production scale. AMMs price assets by a deterministic mathematical invariant — the original Uniswap v1 used the constant-product formula x * y = k, which the Bank for International Settlements covers in detail in its 2021 quarterly review. Today Uniswap is the reference implementation against which every other DEX — SushiSwap, PancakeSwap, Curve, Balancer, Aerodrome, Velodrome, Camelot, Raydium, Orca, Jupiter, THORChain — is benchmarked.

By April 2026 Uniswap has cumulatively settled more than $3 trillion in trade volume, deployed on 30+ chains, and become governed by holders of the UNI token through the Uniswap DAO and the Uniswap Foundation. The latest major version, Uniswap v4, shipped January 2025 and introduced "hooks" — pluggable smart contracts that wrap pool lifecycle events and enable an entirely new class of on-chain liquidity primitives.

Who founded Uniswap?

Hayden Adams founded Uniswap. Adams was a 2016 mechanical-engineering graduate working at Siemens when he was laid off in mid-2017. A friend, Karl Floersch (then at the Ethereum Foundation, later at Optimism), suggested he learn smart-contract development. Vitalik Buterin's 2016 forum post sketching a "constant-product on-chain market maker" — itself building on a 2016 idea by Alan Lu and a Reddit comment by "ethrocket" — gave Adams the design target.

He spent thirteen months alone building v1 in Solidity and Vyper, surviving on a $100,000 Ethereum Foundation grant awarded in 2018. The protocol, originally called "Unipig," shipped on Ethereum mainnet on November 2, 2018 at Devcon 4 in Prague. The full origin story has become Silicon Valley folklore — Adams' own "Path to Uniswap V1" blog post is a primary source.

Adams remains CEO of Uniswap Labs, the New York City–based corporate entity that builds the front end (app.uniswap.org), the Uniswap mobile and browser-extension wallet, and now Unichain. Day-to-day protocol governance is run by the independent Uniswap Foundation (Devin Walsh, executive director), a Delaware non-profit that funds grants, manages relationships with the broader Uniswap DAO, and represents UNI holders. Major venture investors over the years include Andreessen Horowitz (a16z), Paradigm, Polychain Capital, Variant Fund, Coinbase Ventures, USV and SV Angel — Labs has raised over $176 million across multiple rounds at a peak valuation around $1.66 billion (Series B, October 2022).

Uniswap timeline 2017-2026

• Mid-2017 — Hayden Adams laid off from Siemens; starts learning Solidity at Karl Floersch's suggestion.
• 2018 — Ethereum Foundation grants Adams $100,000 to build v1.
• November 2, 2018 — Uniswap v1 launches on Ethereum mainnet at Devcon 4. ETH–ERC-20 pairs only, constant-product x*y=k.
• April 2019 — Uniswap Labs raises $1.8M seed (Paradigm).
• May 18, 2020 — Uniswap v2 launches. ERC-20–ERC-20 pairs, flash swaps, TWAP oracles.
• August 2020 — Uniswap Labs raises $11M Series A (a16z lead).
• September 16, 2020 — UNI airdrop: 400 UNI to ~250,000 wallets that had ever used v1 or v2 — worth ~$1,400 at launch, ~$18,000 at the May 2021 peak. The drop seeded the UNI DAO and remains the most-cited reference airdrop in crypto history.
• May 5, 2021 — Uniswap v3 launches on Ethereum mainnet. Concentrated liquidity, multiple fee tiers (0.05%, 0.30%, 1%), positions tokenised as NFTs (ERC-721).
• 2022 — v3 deploys on Polygon, Arbitrum, Optimism, Celo and BNB Chain. Business Source License (BSL) on v3 expires April 2023, freeing forks.
• June 13, 2022 — Uniswap Labs acquires Genie, an NFT aggregator (later integrated as the in-app NFT marketplace).
• October 2022 — Series B at $1.66B valuation (Polychain lead).
• July 17, 2023 — UniswapX launches. Off-chain signed orders, on-chain settlement by competing solvers; introduces gas-free swaps for end users.
• June 2024 — V4 codebase first audited; bug bounty announced ($15.5M, the largest in history).
• October 10, 2024 — Unichain announced.
• October 31, 2024 — Unichain mainnet launches (OP Stack + Flashbots Rollup-Boost).
• January 31, 2025 — Uniswap v4 launches on Ethereum, Optimism, Arbitrum, Base, Polygon, BNB Chain, Avalanche and Unichain. Hooks live; ~150 audited hooks shipped within the first 90 days.
• December 26, 2025 — UNIfication governance proposal #79 passes with ~125M UNI for. Protocol fee switch activates on selected v2/v3 mainnet pools; Uniswap Labs commits to a 100M UNI burn (~10% of supply).
• Q1 2026 — Hook ecosystem matures: Bunni v2, EulerSwap, Cork, Doppler, Sorella PROOF and dozens more deployed in production.
• April 2026 — Uniswap is live on 30+ chains; Unichain enters the top-10 Ethereum L2s by gas burned.

How Uniswap works (technical mechanics)

Liquidity pools and the constant-product formula

A Uniswap pool is a smart contract holding reserves of two tokens, x and y. The constant-product invariant requires that x * y = k after every trade, where k is constant. If a trader sends in Δx of token X, they receive Δy of token Y such that (x + Δx) * (y - Δy) = k. The fee is taken off Δx before the swap. The deeper the reserves (the larger k), the smaller the price impact for a given trade size.

Liquidity providers and LP tokens

Anyone can deposit equal value of two tokens into a pool and receive an LP share representing their proportional claim on reserves and fees. In v1/v2 LP tokens are fungible ERC-20s. In v3 and v4, LP positions are non-fungible (ERC-721 NFTs) because each position has a unique price range.

Fee tiers

V2 used a flat 0.30% LP fee. V3 introduced four fee tiers: 0.01% (stable-stable like USDC/USDT), 0.05% (correlated pairs like USDC/ETH on stable rails), 0.30% (standard pairs) and 1.00% (exotic pairs). Each tier is a separate pool. V4 generalises this further — a hook can implement any fee schedule, including dynamic fees that change with volatility, volume or external oracles.

Pricing oracles

Every Uniswap pool publishes a TWAP (time-weighted average price) that other DeFi protocols can read. Aave, Sky/MakerDAO and Compound historically used Uniswap TWAPs for collateral pricing, although most have migrated primary feeds to Chainlink. V4 hooks can publish per-pool oracles cheaper than v3.

Routing and the Universal Router

Uniswap's front end and SDK route trades through the Universal Router, which can chain swaps across multiple v2, v3 and v4 pools, mix in UniswapX intents, and even bridge through LI.FI or other partners. Aggregators like 1inch, ParaSwap and CoW Swap regularly route 50%+ of their volume through Uniswap pools.

Uniswap V1 (Nov 2018)

V1 was a proof of concept. Each pool paired ETH with one ERC-20 token, the contract was non-upgradeable, and there was no governance, no fee switch, no oracle and no flash loan. The fee was a flat 0.30%, all of which went to LPs. V1 contracts are still deployed on Ethereum mainnet — they processed $169M in volume in their first year — but no new pools have been created on v1 since v2 shipped in May 2020.

Uniswap V2 (May 2020)

V2 generalised the design to ERC-20–ERC-20 pairs (no need to route through ETH), added flash swaps (borrow either asset, repay in the same transaction), and introduced TWAP oracles that any contract can read. V2 also added a dormant fee switch controlled by an admin address (originally Uniswap Labs, later UNI governance) that could route 1/6 of LP fees to a protocol address — this switch was never flipped until UNIfication in December 2025.

V2 was the workhorse of DeFi Summer 2020. At its peak in May 2021 it held $9B in TVL and processed $42B in monthly volume. It is still actively used today for tail-end tokens and as the deepest-liquidity pool for thousands of pairs that are too small to attract concentrated-liquidity LPs on v3 or v4.

Uniswap V3 (May 2021): concentrated liquidity

V3 was the largest design leap in DEX history. Instead of spreading LP capital uniformly across (0, ∞) like v2, Uniswap v3 lets each LP choose a price range within which their capital provides liquidity. Within the range, capital is concentrated at the active tick, dramatically improving capital efficiency — typically 100-200x for ETH/stable pairs and up to 4,000x for tight stable-stable ranges.

This came with three trade-offs:

1. Active management. A range that goes out of bounds earns zero fees until rebalanced. Specialist LP managers like Arrakis, Gamma and Bunni emerged to automate this.
2. Worse impermanent loss for narrow ranges. Concentration amplifies divergence loss when the price moves outside the range.
3. NFT positions. Each position is unique (range + fee tier + token pair), so v3 LP tokens are ERC-721 NFTs minted by the NonfungiblePositionManager contract, not fungible ERC-20s. This complicated composability — most yield-aggregator integrations had to be rewritten for v3.

V3 dominated Uniswap volume from 2022 to 2024, processing 70-90% of all Uniswap traffic in that period. It deployed on 14+ chains. The Business Source License expired in April 2023, after which forks — including PancakeSwap v3, Aerodrome Slipstream and many others — proliferated.

Uniswap V4 (Jan 2025): hooks

Uniswap v4 launched January 31, 2025. It keeps v3's concentrated-liquidity math but completely re-architects the contract layout and adds the hooks primitive that defines its identity.

Singleton architecture

V2 and v3 deployed one new pool contract per pair. V4 deploys one PoolManager singleton that holds every pool's state. This makes pool creation 99% cheaper, multi-hop swaps run within a single contract (no inter-contract calls), and ETH itself can be a native pool asset (no WETH wrapping required).

Flash accounting

V4 uses transient storage (EIP-1153, available post-Cancun) to track balance deltas during a transaction without writing to permanent storage. This makes complex flash-loan-style operations across multiple pools dramatically cheaper.

Hooks: the headline feature

A hook is a smart contract that pool creators attach at pool initialisation. The PoolManager calls the hook at fourteen lifecycle moments — beforeInitialize, afterInitialize, beforeAddLiquidity, afterAddLiquidity, beforeRemoveLiquidity, afterRemoveLiquidity, beforeSwap, afterSwap, beforeDonate, afterDonate, plus four return-delta variants. A hook can:

• Charge dynamic fees (e.g. higher in volatile periods).
• Implement on-chain limit orders (the hook posts a virtual order; if the pool tick crosses, the hook executes).
• Run a TWAMM (time-weighted AMM) that fills a large order over many blocks.
• Redirect MEV revenue back to LPs (auctioning the right to be the first swap each block).
• Publish custom oracles (e.g. EMA prices, volatility surfaces).
• Block specific addresses (KYC pools, sanctions compliance — the basis of Aave Arc-style permissioned DeFi on Uniswap).
• Compose with Aave, Pendle, Sky, Morpho, EulerSwap and any other protocol atomically inside the swap.

By Q2 2026 ~150 hooks are deployed in production with combined hook-managed TVL above $1.5B.

UniswapX (intent-based routing)

UniswapX launched July 17, 2023. It is not an AMM — it is an off-chain order-book where users sign intents (e.g. "swap 1000 USDC for ≥ 0.30 ETH within 30 seconds, deadline T") and competing fillers (also called solvers) bid to settle the order on-chain. Fillers must beat or match the best Uniswap on-chain quote (the "RFQ floor"), can route through any liquidity venue (v2, v3, v4, off-chain market makers, CoW), and pay the user's gas — making swaps gas-free from the trader's perspective. UniswapX cross-chain orders launched in early 2024 and now settle via Across and Wormhole bridges.

UniswapX is structurally similar to CoW Swap and 1inch Fusion but is the highest-volume intent system, processing roughly 25-40% of Uniswap front-end swaps by Q1 2026.

Unichain: the DeFi-native Layer 2

Unichain is Uniswap Labs' Ethereum Layer 2 rollup, announced October 10, 2024 and launched on mainnet October 31, 2024 (the Unichain mainnet event). Three design choices distinguish it:

1. OP Stack base. Unichain uses Optimism's open-source rollup framework, making it natively interoperable with the broader Optimism Superchain.
2. Flashbots Rollup-Boost. A verifiable, tee-attested block-builder pipeline gives Unichain 1-second block times (vs 2s on most OP Stack chains) and lets the chain internalise MEV — recapturing sandwich and priority-gas value that would otherwise leak to bots.
3. DeFi-native economics. After UNIfication, sequencer revenue from Unichain is rerouted to the UNI fee-collection contract rather than retained by Uniswap Labs as a private revenue stream. This is the closest a major L2 has come to fully aligning rollup economics with a token-holder base.

By April 2026 Unichain hosts roughly $1B in TVL, is in the top 10 Ethereum L2s by gas burned, and is a primary settlement venue for v4 hook deployments that benefit from sub-second finality (perp-style hooks, frequent rebalancers).

The UNI token, governance and UNIfication

Tokenomics

UNI launched September 16, 2020 with a fixed 1 billion supply released over four years:

• 60% to community — 15% airdrop, 43% governance treasury, 2% liquidity-mining program (Sep 2020–Mar 2021).
• 21.51% to Uniswap Labs team (4-year cliff).
• 17.80% to investors (4-year vest).
• 0.69% to advisors.

After year four (September 2024), a 2% perpetual annual inflation kicks in to fund ongoing governance — at the DAO's discretion, this can be (and has been) effectively zero.

Governance

UNI holders can submit proposals once they hold or are delegated at least 2.5M UNI. Proposals pass with a quorum of 40M UNI for a "yes" plurality. Voting happens via Compound Governor Bravo–style on-chain voting. UNI holders can also delegate their vote to active community members (the "delegate ecosystem"). Major delegate organisations include the Uniswap Foundation itself, GFX Labs, Argent, StableLab, Wintermute Governance and various university blockchain clubs.

Treasury

The UNI DAO treasury holds approximately $3 billion+ in UNI plus several hundred million in stablecoins and other assets accumulated through token sales and yield. It funds Uniswap Foundation grants, public-goods initiatives (e.g. Optimism RetroPGF rounds, Devcon sponsorships) and protocol upgrades.

UNIfication (December 26, 2025)

For seven years, UNI was widely criticised as "governance theatre" — holders could vote, but the protocol returned no economic value to them because the v2/v3 fee switch was never flipped. UNIfication ended that debate.

Governance proposal #79, drafted by Uniswap Labs and the Uniswap Foundation jointly with major delegates, did three things:

1. Activated the protocol fee switch on selected v2 and v3 Ethereum-mainnet pools (initially 1/5 of the LP fee on the top 100 pools by volume; the parameter is now DAO-tunable).
2. Committed Uniswap Labs to burn 100 million UNI from its treasury, reducing circulating supply by ~10%.
3. Aligned Labs and DAO economics by routing future Unichain sequencer revenue and UniswapX surplus to the UNI fee-collection contract.

The vote passed December 26, 2025 with ~125 million UNI voting yes (against ~3M no, roughly 36% of the eligible electorate participating — well above quorum). UNI rallied 35-50% in the two weeks around the vote and a further 25-40% on the burn announcement. As of April 2026 the protocol fee contract has accrued ~$45M in fees; the DAO has not yet distributed these to holders (a "fee router" proposal is in active discussion).

30+ chains: where Uniswap runs

Uniswap is the most-deployed DEX in crypto. As of April 2026 the protocol runs on:

Cross-chain swaps are routed through UniswapX cross-chain orders, LI.FI, Across and Wormhole. THORChain provides native BTC↔ERC-20 routing that integrates as a UniswapX filler.

Fee tiers, NFT positions and LP mechanics

V3 introduced four fee tiers that have become the de facto standard across nearly every concentrated-liquidity DEX:

Liquidity positions are NFTs in v3 and v4. Each position has a unique combination of (token0, token1, feeTier, lowerTick, upperTick), so the NonfungiblePositionManager (v3) and PositionManager (v4) mint an ERC-721 to the LP. Specialist managers like Arrakis, Gamma, Bunni and Steer wrap NFT positions in vaults for passive LPs.

V4 adds dynamic fees. A pool's hook can adjust the fee on every swap based on volatility, time of day, oracle prices or arbitrary on-chain signals. The Bunni v2 hook, for example, uses an EMA volatility estimator to widen fees during volatile windows and tighten them in calm markets, reproducing Uniswap CLMM's "auto-tuned" fees algorithmically.

The hooks ecosystem: what's being built on V4

By April 2026 the Uniswap v4 hooks ecosystem includes:

• Bunni v2 — LP rehypothecation: idle pool capital is auto-deposited into Aave, Morpho or Sky to earn yield while waiting to be swapped.
• EulerSwap — Hooks that bind v4 pools to Euler v2 lending vaults so a swap can simultaneously borrow against itself.
• Cork — Depeg insurance hooks that pay out if a stable goes off-peg by more than a threshold.
• Doppler — Token-launch hook: progressive Dutch auction inside a v4 pool, replacing fair-launch LBPs.
• Sorella PROOF — MEV-recapture hook that auctions block-top swap rights to searchers and rebates LPs.
• TWAMM (Time-Weighted AMM) — Implements long-running orders that fill linearly over multiple blocks, originally proposed by Paradigm.
• Limit-order hooks — Multiple implementations (Hookd, Blaze) for on-chain limit orders without a separate book.
• Range-order vaults — Bunni, Gamma, Arrakis and Steer all run v4-native vaults.
• Custom AMM curves — Curve-style stableswap, Balancer-weighted, RMM (replicating market makers) implemented as hooks rather than separate protocols.
• Compliance hooks — KYC pools using on-chain identity (e.g. Quadrata, Coinbase Verifications) for institutional liquidity.

The Uniswap Foundation runs an Atrium grants program and hooks bug bounty to seed and secure this ecosystem.

Uniswap V4 use cases

Dynamic fees

Replaces v3's static tier choice with on-the-fly fee adjustment. Volatile windows charge more (compensating LPs for higher impermanent loss), calm windows charge less (winning more flow from aggregators). Bunni v2 reports 15-40% LP-revenue uplift vs equivalent v3 pools.

On-chain limit orders

A hook posts a virtual order at a chosen tick. When the pool's price crosses, the hook fills the order at exact tick price (no slippage). For the first time in DEX history, retail users can place limit orders without a centralised order book or off-chain solver.

Custom AMMs

Stableswap, weighted, RMM and even discrete-tick "logarithmic market maker" curves can be implemented as v4 hooks instead of separate protocols. This collapses fragmentation: one liquidity ledger (the v4 PoolManager), many pricing curves on top.

MEV recapture

The Sorella PROOF hook (and similar) auction the right to be the first swap each block to MEV searchers; the auction proceeds rebate LPs. Early data suggests 30-60% of MEV that previously leaked to private builders now returns to v4 LPs.

KYC and permissioned pools

Compliance hooks check that a swapper holds a specific on-chain attestation (sanctions-clear, accredited investor, qualified counterparty). This is the on-chain replacement for Aave Arc and the foundation for institutional DeFi on a permissionless protocol.

Uniswap vs Curve, Balancer, PancakeSwap, Aerodrome

Uniswap remains the volume and brand leader on Ethereum and most L2s, but is not dominant on every chain — PancakeSwap owns BNB, Aerodrome owns Base by a thin margin, Raydium and Jupiter own Solana, THORChain owns native cross-chain.

TVL, volume and market data in 2026

• Onchain TVL (April 2026): ~$3B across v2, v3 and v4 — relatively low because v3 concentrated liquidity needs less capital to do the same volume.
• Annual spot volume (TTM April 2026): ~$1.2 trillion across all chains and versions.
• Cumulative all-time volume: $3 trillion+.
• Daily active addresses (Ethereum + L2s): 200,000-450,000 depending on market activity.
• UNI market cap: ~$10-13B (post-100M-burn supply).
• UNI fully diluted valuation: same — supply is now effectively capped.
• Unichain TVL: ~$1B.
• Hook-managed TVL: ~$1.5B+ across 150+ deployed hooks.
• Front-end share of total Uniswap traffic: ~35-45% (the rest comes from aggregators 1inch, ParaSwap, CoW, LI.FI and direct integrations).

Sources: DefiLlama Uniswap dashboard, Uniswap Foundation quarterly reports, Dune Analytics community dashboards, Messari State of DeFi 2024.

Hack and exploit history

In eight years and ~$3T cumulative volume, Uniswap's core router and pool contracts have never been successfully exploited. Every reported incident has involved peripheral or third-party code:

• April 2020 (v1, imBTC) — A re-entrancy attack on imBTC (an ERC-777 token, not Uniswap) drained an imBTC/ETH v1 pool. Cause: ERC-777 hook callbacks; v2 added re-entrancy guards.
• July 2022 (Universal Router phishing) — Malicious frontends abused the permit2 approval pattern. Mitigated by Uniswap Wallet's transaction-simulation UI and Rabby/Pocket Universe integrations.
• April 2023 (V3 fork pool spoofing) — Fake "v3 forks" listed scam tokens. Not a Uniswap issue but a permissionless-listing reality.
• 2024-2025 (token-side scams) — Routine: scam tokens listed in v2/v3/v4 pools rug-pull retail buyers. The protocol is permissionless; due diligence is the user's responsibility.
• No core-contract exploit — Trail of Bits, OpenZeppelin, ABDK and a $15.5M v4 bug bounty have produced zero unrecovered losses on Uniswap-native code.

The track record is the single strongest argument for using Uniswap over forks of Uniswap.

Risks and criticism

1. Hook risk (v4). A malicious or buggy hook can drain a pool, charge confiscatory fees or block withdrawals. The protocol can't protect users from hooks they opt into. Always inspect hook source, audits and TVL before LPing into a custom-hook v4 pool.
2. Impermanent loss. Especially severe for narrow-range v3/v4 LPs. Bancor's research and Paradigm post-mortems show median LPs underperform a 50/50 hold over 12-month horizons in volatile pairs.
3. Phishing and approval drainers. The biggest single risk for retail. Use a hardware wallet, Rabby's transaction simulator, never approve unlimited spends on unfamiliar contracts.
4. Permissionless listing. Anyone can list a token. Roughly 70-90% of v2/v3 pools are scam or honeypot tokens. Always verify contract addresses on Etherscan, Defined.fi or Coingecko.
5. MEV. Sandwich attacks on Uniswap v3 cost retail traders an estimated $400-700M in 2024. UniswapX, v4 MEV-recapture hooks (Sorella PROOF) and Unichain's Rollup-Boost are the structural fixes.
6. Regulatory. The SEC sent Uniswap Labs a Wells notice in April 2024; charges were dropped February 2025 after regulatory turnover. The IOSCO 2023 DeFi report and FSB 2023 financial-stability assessment treat Uniswap-class DEXes as the canonical case study for "DeFi without intermediaries."
7. Centralisation residual. Uniswap Labs still controls the dominant front end (app.uniswap.org), the iOS/Android wallet brand, and the Universal Router upgrade key (multi-sig). Censorship of specific tokens or addresses on the front end has happened (OFAC-sanctioned addresses) — though the smart contracts themselves remain permissionless.
8. L2 fragmentation. Liquidity is split across 30+ chains. Aggregators (UniswapX cross-chain, LI.FI, 1inch) are the partial fix.

How to use Uniswap (step-by-step)

Buying a token (basic swap)

1. Install a self-custodial wallet — Uniswap Wallet, MetaMask or Rabby (recommended for transaction simulation).
2. Fund the wallet with ETH or USDC from a regulated exchange (Coinbase, Kraken). For L2s, also bridge ETH via the Uniswap Wallet, Across or the official L2 bridge.
3. Go to app.uniswap.org. Always verify the URL — phishing clones cost users millions every year.
4. Connect your wallet. Choose the network (Ethereum mainnet, Base, Arbitrum, Unichain etc.).
5. Select the input token (ETH/USDC) and output token. Paste the contract address if it's not in the default list — never trust ticker matches alone.
6. Review the price impact and slippage tolerance. Default 0.5% slippage is fine for blue-chip pairs; raise to 1-3% for tail tokens; never above 5% unless you understand the consequences.
7. Click "Swap," sign the approval transaction (one-time per token), then sign the swap transaction. UniswapX swaps are gas-free; standard v2/v3/v4 swaps charge L1 or L2 gas.
8. Wait for confirmation (12 seconds on Ethereum, 1-2 seconds on most L2s and Unichain).

Providing liquidity (v3 / v4)

1. Decide pair, fee tier and price range. Tighter range = more fees but more out-of-range risk. ETH/USDC at 0.05% with ±10% range is a typical conservative choice.
2. Connect wallet, choose "Pool" → "New Position."
3. Approve both tokens, deposit equal value.
4. The protocol mints an ERC-721 NFT representing your position.
5. Monitor and rebalance as needed — or use Arrakis, Gamma or Bunni for automated management.

Voting in governance

1. Hold UNI in a wallet that supports delegation (most do).
2. Visit app.uniswap.org/vote or Tally.xyz.
3. Delegate to yourself (to vote directly) or to an active delegate.
4. Vote on proposals — quorum is 40M UNI; threshold to submit is 2.5M UNI.

Research and reports

• The Bank for International Settlements 2021 quarterly review on AMMs — the canonical academic primer.
• BIS DeFi 2021 quarterly review — broader DeFi landscape including Uniswap.
• Messari State of DeFi 2024 — full-year metrics.
• Delphi Digital DeFi Thesis 2024 — qualitative assessment, hook ecosystem.
• Nansen DeFi Report 2024 — flow and wallet analysis.
• DefiLlama DeFi Review 2024 — TVL and volume snapshot.
• a16z State of Crypto 2025 — UNI tokenomics, governance benchmark.
• IOSCO DeFi Final Report 2023 — regulatory perspective.
• FSB Financial Stability Risks of DeFi 2023 — systemic-risk assessment.

FAQ

What is Uniswap?

Uniswap is the largest decentralized exchange (DEX) on Ethereum and most EVM Layer 2s, founded by Hayden Adams in November 2018. It uses an automated market maker (AMM) model — pricing trades algorithmically against pooled liquidity — instead of a traditional order book. By April 2026 Uniswap has settled $3T+ in cumulative volume across four major versions (v1, v2, v3, v4) and 30+ chains, and is governed by holders of the UNI token through the Uniswap DAO.

Who founded Uniswap?

Hayden Adams, a former Siemens mechanical engineer, founded Uniswap in 2018. He learned Solidity at Karl Floersch's suggestion and built v1 over thirteen months funded by a $100,000 Ethereum Foundation grant. Adams remains CEO of Uniswap Labs. The protocol is now governed by the Uniswap Foundation (a Delaware non-profit) and the broader Uniswap DAO.

What is the difference between Uniswap V2, V3 and V4?

V2 (May 2020) generalised the design to ERC-20–ERC-20 pairs and added flash swaps and TWAP oracles. V3 (May 2021) introduced concentrated liquidity, where LPs supply within a chosen price range, achieving 100-4,000x capital efficiency at the cost of active management. V4 (January 2025) keeps concentrated liquidity but rebuilds the architecture as a singleton with hooks — pluggable callbacks enabling dynamic fees, on-chain limit orders, custom oracles, MEV recapture and arbitrary AMM curves.

What are Uniswap V4 hooks?

Hooks are user-supplied smart contracts attached to v4 pools. They expose 14 callbacks across the pool lifecycle (before/after initialize, swap, modify-liquidity, donate). A hook can charge dynamic fees, implement on-chain limit orders, run TWAMM, recapture MEV, publish custom oracles, gate access (KYC pools) and compose with any other protocol atomically. By Q2 2026 ~150 hooks are deployed in production with $1.5B+ in hook-managed TVL.

What is the UNI token used for?

UNI is Uniswap's governance token. Holders vote on the on-chain treasury (~$3B+), set protocol fees, approve grants, deploy on new chains, and (post-UNIfication December 2025) collect activated protocol fees on selected v2 and v3 mainnet pools. UNI was airdropped September 16, 2020 — 400 UNI to ~250,000 wallets that had ever used v1 or v2, the most-cited reference airdrop in crypto history.

What was the UNIfication vote in December 2025?

UNIfication was Uniswap governance proposal #79, passed December 26, 2025 with ~125 million UNI in favour. It activated the long-debated protocol fee switch on selected v2 and v3 Ethereum-mainnet pools, committed Uniswap Labs to burn 100 million UNI (~10% of supply), and aligned Labs and DAO economics by routing future Unichain sequencer revenue and UniswapX surplus to UNI holders. UNI rallied 35-50% around the vote.

What is Unichain?

Unichain is Uniswap Labs' Ethereum Layer 2 rollup, launched on mainnet October 31, 2024. It is built on the OP Stack with Flashbots Rollup-Boost, giving it 1-second block times and verifiable, MEV-internalising block production. Unichain hosts v3 and v4 deployments, holds ~$1B in TVL by April 2026, and is the first major L2 whose sequencer revenue routes back to the protocol's token holders rather than to the operating company.

How do Uniswap fees work?

V2 charged a flat 0.30% LP fee. V3 introduced four tiers — 0.01%, 0.05%, 0.30%, 1.00% — chosen per pool. V4 makes fees fully dynamic via hooks. After UNIfication, a fraction of LP fees on activated v2/v3 mainnet pools also routes to the protocol fee-collection contract. Front-end users of app.uniswap.org additionally pay a 0.15-0.25% interface fee to Uniswap Labs.

Is Uniswap safe?

Uniswap's core contracts have settled $3T+ in eight years with no successful exploit of the router or pool code. The main risks for users are not protocol bugs but: (1) phishing on fake front ends, (2) trading scam tokens in permissionless pools, (3) impermanent loss for narrow-range v3 LPs, (4) oracle manipulation in low-liquidity pools, and (5) malicious or buggy v4 hooks — always inspect a hook before LPing.

How does Uniswap make money?

Three streams. (1) Uniswap Labs charges a 0.15-0.25% interface fee on swaps routed through app.uniswap.org and the Uniswap Wallet. (2) Uniswap Labs operates Unichain and earns sequencer revenue (until UNIfication reroutes it). (3) The UNI treasury earns yield on its on-chain reserves, and post-UNIfication collects activated protocol fees on selected v2/v3 pools. Labs has additionally raised over $176M in venture rounds at a peak ~$1.66B valuation.

Glossary

• AMM (automated market maker) — Algorithmic pricing model that replaces order books with pooled reserves and a deterministic invariant.
• Concentrated liquidity — V3/V4 design where LPs choose a price range; dramatically improves capital efficiency.
• Constant product (x*y=k) — Original Uniswap v1/v2 invariant.
• Fee tier — V3 fee level (0.01% / 0.05% / 0.30% / 1.00%).
• Flash swap — V2+ feature: borrow either asset of a pool and repay in the same transaction.
• Hook — V4 smart contract attached to a pool that runs at lifecycle moments (before/after swap etc.).
• Impermanent loss (IL) — Difference between holding tokens and providing liquidity when prices diverge.
• LP (liquidity provider) — User who deposits two tokens into a pool to earn fees.
• NFT position — V3/V4 LP share represented as an ERC-721 with a unique price range.
• PoolManager — V4 singleton contract that holds every pool's state.
• Singleton — V4 architecture where one contract holds all pools (vs one contract per pool in v2/v3).
• TWAP — Time-weighted average price; on-chain oracle every Uniswap pool publishes.
• TWAMM — Time-weighted AMM; long-running orders that fill across many blocks.
• Tick — V3/V4 price granularity unit (every 0.01% step).
• UNI — Uniswap's ERC-20 governance token.
• UNIfication — December 2025 governance proposal #79 that activated the fee switch and burned 100M UNI.
• Universal Router — Uniswap's smart router that chains swaps across v2/v3/v4 and UniswapX.
• Unichain — Uniswap Labs' OP Stack Layer 2 launched October 2024.
• UniswapX — Off-chain intent-based RFQ system; gas-free, solver-filled swaps.
• ve(3,3) — Vote-escrowed token model used by Curve, Aerodrome, Velodrome.

Related reading (internal links)

• What is DeFi? 2026 Guide
• What is Ethereum? 2026 Guide
• Ethereum Layer 2 Networks 2026 Guide
• Aave Complete Guide 2026
• MakerDAO is Now Sky: USDS, SKY and Endgame 2026 Guide
• Stablecoins Explained 2026 Guide

Related comparisons

• Compare: Uniswap vs Curve
• Compare: Uniswap v3 vs Uniswap v4
• Compare: Uniswap v4 vs Uniswap v2
• Compare: Uniswap v3 vs Balancer
• Compare: Uniswap v2 vs PancakeSwap
• Compare: Uniswap v3 vs Raydium

Sources and further reading

• Uniswap Foundation. (2025). Uniswap v4 release blog post
• Uniswap Foundation. (2025). UNIfication blog post
• Uniswap Foundation. (2021). Uniswap v3 release blog post
• Uniswap Foundation. (2023). Introducing UniswapX
• Uniswap Foundation. (2024). Introducing Unichain
• Uniswap docs
• Uniswap.org
• BIS. (2021). DeFi automated market makers — quarterly review
• BIS. (2021). DeFi risks and the decentralisation illusion
• DefiLlama. Uniswap protocol dashboard
• SEC. (2024). Uniswap Labs Wells Notice press release
• Uniswap v4-core GitHub
• IOSCO. (2023). Final report on DeFi
• FSB. (2023). The financial stability risks of decentralised finance
• Coingecko Research. DEX-to-CEX ratio publication

About the author

DeFi Intel Research is the in-house research arm of DeFi Intel, a quantitative crypto desk operating arbitrage, MEV and yield strategies on Ethereum, Solana and Base. Our analysts run live capital across Uniswap v3 and v4 pools and have first-hand operational experience with hooks, UniswapX integration and LP-vault construction. Editorial standards: every numeric claim sourced; protocol risks declared honestly; no affiliate links. Read more at /about.

Last updated: 2026-04-26