V4 — Singleton Pool Manager with Hooks

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V4 introduces a singleton PoolManager contract that manages all pools in a single deployment, reducing gas costs. It also adds a hooks system for attaching custom logic to pool lifecycle events.

Contracts (Arc Testnet)

Contract	Address
Pool Manager	`0x153816c77256481e8E3189DdCB599caA1dab4389`
Position Manager	`0x2873F8C62c122A403A9939b18eE562cC91f1d0fc`
Quoter	`0x3A693DE0Bf7e48BB247b24C35A5889834c67450B`
State View	`0x7E735D8753700B5130590978AADf03873238DE5F`
Permit2	`0x4ce562F687d0Ced27b79Ba51d79B63BD978F7F48`
Position Descriptor	`0x2df231fc6281d1D9cC21EB1b67f772Ed4259d38f`

Fee Tiers

Same as V3: 0.01%, 0.05%, 0.30%, 1.00%.

Key Differences from V3

All pools are managed by a single PoolManager contract (singleton pattern)
Swaps are executed via PositionManager.modifyLiquidities using SWAP_EXACT_IN_SINGLE
Price output is estimated via the V4 Quoter (quoteExactInputSingle)
An optional hooks address can be specified in the advanced settings panel
Native USDC maps to address(0) in the PoolKey
Uses Permit2 for token approvals

Hooks

V4 hooks allow custom smart contract logic to execute at specific points in the pool lifecycle. The swap UI exposes an optional hooks address field in the advanced section. The default (no hooks) uses the zero address (0x000...000).

ℹ️

Hook contracts are not deployed or managed by UnitFlow. The hooks field is for advanced users who have deployed their own hook contracts on Arc Testnet.

Components

V4SwapCard — swap interface with fee tier and optional hooks address
V4AddLiquidity — add V4 liquidity
V4RemoveLiquidity — remove V4 positions
V4Positions — view active V4 positions
V4PoolsList — browse V4 pools

Data

V4 pool data is fetched from a GraphQL subgraph via the useV4GraphQL hooks:useV4Pools, useV4ProtocolStats, and useV4Positions.