Fee sharing hook on Ethereum

Volume (24h)

$0

Value locked (TVL)

$0

All-time volume

$0

Pools using this hook

1

Swaps (24h)

159 (76 traders)

Total swaps

159

What it does

This hook takes buy and sell swap fees on a token-wrapped Uniswap v4 pool and distributes accrued rewards to holders, with fee rates set by fixed basis-point constants.

How it works step by step

• Acts as an ERC20-style token wrapper around a Uniswap v4 pool, with its own balances, allowances and total supply in storage
• Takes swap fees through beforeSwapReturnDelta and afterSwapReturnDelta, with separate buy and sell fee bps constants and running totals of buy and sell fees
• Accrues rewards per holder via reward weight, reward debt and eligible supply, with claim and pending reward views
• Maintains a reward exempt list and a social address that is settable by the owner
• Includes a ghost-related function group (ghost, ghostVault, GHOST_AFTER, carry) that appears to move or redistribute balances, but its exact logic cannot be confirmed without source
• Uses an ownable two-step ownership pattern (transferOwnership, acceptOwnership, renounceOwnership)

Swap behaviour

beforeSwap and afterSwap run on every swap, and both have return-delta permissions, so the hook can take or credit a fee on swaps; from the selectors, buy and sell sides are distinguished with separate fee constants (BUY_FEE_BPS and SELL_FEE_BPS), though the exact direction mapping cannot be confirmed from bytecode alone.

Liquidity behaviour

beforeAddLiquidity, afterAddLiquidity, beforeRemoveLiquidity and afterRemoveLiquidity selectors exist in the decoded interface but the hook does not advertise liquidity permissions, so these are likely unused stubs; beforeDonate and afterDonate are similarly present in the ABI without matching permissions.

Fee behaviour

Hook takes swap fees via return deltas, with separate buy and sell fee rates in basis points (BUY_FEE_BPS, SELL_FEE_BPS) and tracked totals (totalBuyFees, totalSellFees); the pool also has a static LP_FEE. Exact rates cannot be read from the decoded input.

Owner & admin controls

Owner (Ownable, two-step transfer) can set the social address via setSocial and can set reward exemptions via setRewardExempt; owner can renounce or transfer ownership. No pause or upgrade mechanism is visible in the decoded selectors, and the contract does not appear to be a proxy.

Enabled Uniswap v4 callbacks

beforeInitialize, beforeSwap, afterSwap, beforeSwapReturnDelta, afterSwapReturnDelta

beforeInitialize sets up the pool (poolInitialized, poolId, POOL_INITIALIZER guard); beforeSwap and afterSwap apply and account for fees; beforeSwapReturnDelta and afterSwapReturnDelta let the hook take a share of swap amounts; afterInitialize is present for initialization bookkeeping.

Security & trust assessment

Risk level: high, estimated (decoded bytecode, low confidence).

Who controls it: The owner key can change the social address, manage reward exemptions and transfer or renounce ownership; the owner could alter reward accounting and reward eligibility for holders.

Risk to user funds: The hook can take swap fees through return deltas and move balances through ghost-related functions, so user and pool funds are exposed to fee capture and balance redistribution.

Security findings

• [medium] Return-delta fee capture: beforeSwapReturnDelta and afterSwapReturnDelta permissions let the hook alter swap amounts and take tokens from swappers, so fee terms directly affect trader outcomes.
• [medium] Owner-set social address and reward exemptions: The owner can change the social address and reward exempt list via setSocial and setRewardExempt, which can redirect or alter reward distribution without user consent.
• [medium] Ghost and carry mechanics unclear: The ghost, ghostVault, GHOST_AFTER and carry functions move or redistribute balances, and their conditions cannot be verified without source, so user funds may be affected in ways that are hard to audit.
• [info] Unverified source: No verified source is available, so all findings are based on decoded selectors and storage layout rather than reviewed code.

Contract details

Verified source

No

Bytecode size

10,753 bytes

Upgradeable proxy

No

Detected patterns

erc20, liquidity-management, moves-currency, ownable, return-delta, rewards

Pools using Fee sharing hook