Likely fee sharing hook on Avalanche

Uniswap v4 Hook Contract 0x05321f37b95cbe2555f2ecbca4f126bed4750044 on Avalanche · Fee sharing

Volume (24h)
$0
Value locked (TVL)
$0
All-time volume
$11
Pools using this hook
1
Swaps (24h)
0 (0 traders)
Total swaps
2

What it does

Takes a fixed basis-point fee from pool swaps on allowed pools and routes the collected value to a strategy manager.

This read was written for the hook 0x9f2c…c044 on Avalanche and reused here: the two run the same code.

How it works step by step

  • Runs after every swap on pools the owner has allowlisted
  • Computes a fixed fee in basis points (FEE_BPS) on the swap amount
  • Claims that fee as a return delta so it is settled from the swap
  • Accumulates the total in totalFeesCollected
  • Forwards collected value to the configured strategy manager
Swap behaviour
afterSwap runs on each swap and, via the return delta, extracts a fixed FEE_BPS share of the swap output for the hook, recording it in totalFeesCollected.
Liquidity behaviour
No liquidity callbacks are enabled; beforeAddLiquidity and beforeRemoveLiquidity selectors exist in the dispatch table but the hook permissions do not enable them.
Fee behaviour
Takes a fixed fee in basis points (FEE_BPS selector present) from the afterSwap delta and accumulates it in totalFeesCollected (slot 3); the fee is forwarded toward a strategy manager, and the exact split cannot be confirmed without source.
Owner & admin controls
Owner (slot 0) can transfer or renounce ownership, set the strategy manager (slot 1), allow or disallow pools via setPoolAllowed (slot 2 mapping), and call rescueTokens to withdraw tokens held by the hook. No pause or upgrade functions were identified.

Enabled Uniswap v4 callbacks

afterSwap, afterSwapReturnDelta

afterSwap: runs after each swap to compute and collect the hook fee. afterSwapReturnDelta: lets the hook take a share of the swap output as a return delta, which is how the fee is extracted from the pool.

Security & trust assessment

Risk level: medium, estimated (decoded bytecode, medium confidence).

Who controls it: The owner can allow or disallow any pool, change the strategy manager address that receives collected value, and rescue arbitrary tokens from the contract. A malicious or compromised owner key could redirect fees or drain tokens held by the hook.

Risk to user funds: The hook holds and moves fee tokens taken from swaps and can send them to the strategy manager; the owner can also rescue any token balance. Swap execution itself is not shown to be blocked, but depends on the allowlist check in beforeSwap-related logic.

Security findings

  • [info] Return delta takes value from swaps: afterSwapReturnDelta lets the hook claim part of each swap's output, so the hook is an active participant in swap settlement.
  • [medium] Owner can rescue tokens held by hook: rescueTokens lets the owner transfer tokens out of the hook at will, which can include fees awaiting forwarding.
  • [medium] Owner-controlled fee destination: The strategy manager address is owner-settable and fees are sent to it, so a changed address can redirect collected fees.
  • [low] Owner-gated pool allowlist: Pool allowlist is controlled by the owner, so the owner decides which pools receive this hook's behaviour.

Contract details

Verified source
No
Bytecode size
12,135 bytes
Upgradeable proxy
No
Detected patterns
ownable, return-delta

Pools using Likely fee sharing hook