Add PriceImpactDynamicFeeHook hook on ethereum

[hooklist-generator]

Summary

A 2-state dynamic fee hook pinned to a single pool. In the DOWN state, non-owner swaps pay a base LP fee (default 2%); if a swap moves the sqrtPrice beyond a configurable threshold, the crank flips ON and subsequent non-owner swaps pay a fee cap (default 10%). Fee is applied as a beforeSwap LP fee override; the owner (tx.origin) pays 0% and can reset the crank via hookData.

Flags

Flag	Value
beforeInitialize	true
afterInitialize	false
beforeAddLiquidity	false
afterAddLiquidity	false
beforeRemoveLiquidity	false
afterRemoveLiquidity	false
beforeSwap	true
afterSwap	true
beforeDonate	false
afterDonate	false
beforeSwapReturnsDelta	false
afterSwapReturnsDelta	false
afterAddLiquidityReturnsDelta	false
afterRemoveLiquidityReturnsDelta	false

Properties

Property	Value
dynamicFee	true
upgradeable	false
requiresCustomSwapData	false
vanillaSwap	false
swapAccess	none

Warnings

• Submitter did not provide a description. Using AI-generated description.

Closes #1083

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
hooklist	Ready	Preview, Comment	Jul 16, 2026 2:39pm

[github-actions]

Review: hooks/ethereum/0x3a9f9e9fcb1377de2c2f88ea0d8166e92bbf60c0.json

Flags

Address 0x3a9f9e9fcb1377de2c2f88ea0d8166e92bbf60c0 — lowest 14 bits are 0x20C0 (0x60C0 & 0x3FFF):

Bit	Flag	Address	JSON
13	beforeInitialize	1	true ✓
12	afterInitialize	0	false ✓
11–8	addLiquidity/removeLiquidity	0	false ✓
7	beforeSwap	1	true ✓
6	afterSwap	1	true ✓
5–0	donate/returnsDelta	0	false ✓

Confirmed by getHookPermissions() in source, which the constructor validates via Hooks.validateHookPermissions().

Properties

• dynamicFee = true: beforeSwap returns lpFee | LPFeeLibrary.OVERRIDE_FEE_FLAG — a direct LP fee override applied per swap (0% for owner, baseFeePpm 2% or feeCapPpm 10% for others). ✓
• upgradeable = false: No proxy pattern, no delegatecall, no mutable implementation pointer. poolManager and allowedPoolId are immutable. ✓
• requiresCustomSwapData = false: hookData is only inspected in afterSwap for an optional owner crank-reset (if (hookData.length >= 32 && abi.decode(hookData, (bool)) && feeCranked)). Normal swaps work correctly with empty hookData. ✓
• vanillaSwap = false: Correct — dynamicFee is true; the hook actively overrides LP fees, changing swap behavior. ✓
• swapAccess = "none": beforeSwap does not block any caller from swapping. The tx.origin == ownerWallet check only determines which fee tier applies (0% vs base/cap), not whether the swap is permitted. Pool-pinning in beforeInitialize is initialization-time gating, not swap access control. ✓

Metadata

• verifiedSource = true: Confirmed by source_meta.json. ✓
• chainId = 1: Ethereum mainnet — correct for chain ethereum. ✓
• name = "PriceImpactDynamicFeeHook": Exact contract name from source. ✓
• description: Accurately describes the 2-state crank (DOWN/ON), pool-pinning via allowedPoolId, default fees (2% base, 10% cap), beforeSwap LP fee override mechanism, tx.origin owner exemption at 0%, and optional hookData reset. All claims are directly substantiated by the Solidity logic. No marketing, audit, or safety guarantee language. ✓

All fields verified against on-chain source. No issues found.