PackrFeeHook

RobinhoodRegistered

A volatility-based ETH fee hook for Uniswap v4 pools, charging fees between 1% and 5.12% based on the previous swap's tick movement. Buy fees are deducted from ETH input in beforeSwap; sell fees from ETH output in afterSwap. Only exact-input swaps are supported — exact-output swaps revert.

0xf38bf268475621f9b5c79c0b47008257b79f40cc First pool 11 Aug 2026View on explorer

ALooks safeRegistered, verified, immutable

Pools

Dynamic-fee pools

Last new pool

2mo

Code size

5,780 B

What it can do

Runs code on every swap

Its code executes inside each trade in pools that use it.

Can take tokens from swaps

It can take or add tokens during a swap. Fees, burns and custom curves work this way, and so do scams.

Safety report

Automated checks, not an audit

✓Not upgradeableNo proxy pattern found: the code is fixed.

✓No owner foundNo owner() function: nobody has an admin switch (as far as the standard check goes).

✓Listed in Uniswap’s hook registryRegistered with Uniswap Labs (a listing, not a security review).

✓Source code publishedThe code on the block explorer matches what's deployed (contract: PackrFeeHook).

iCan change swap amountsIt has a ReturnDelta permission. Normal for fees and burns, but also how fake-quote hooks steal.

iRestricted swapsSwap access: other. Not everyone can trade every pool.

?No audit linkedAutomated checks only.

Pools using this hook

2 total

PairCreatedFeePool ID

ETH / BAG 2mo 0.00% 0xd414…4714 Tx ↗

ETH / ptes 2mo 0.00% 0xd84a…3baf Tx ↗