Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,088,420
0xf91f…2044
The eight checks
9 pools use this hook, the first one 49 d ago.
- 01caution
Permissions that touch your moneyThe address enables after swap returns delta. The hook is allowed to take; the next two checks measure whether it does.
- 02pass
What it takes from a swapIt takes 1% on top of the pool fee.
- 03pass
LPs can get outLiquidity added and removed in the same block came back whole.
- 04pass
The fee is the feeA fixed fee of 0%, written in the pool key.
- 05caution
No one holds the switchOwned by 0x16F4681314ddfE307c13584BEA336008419886C5. Owner-style functions: setFeeSweepOperator, setFactory, rescuePoolFees, collectBondCashback, setProtocolFeeRecipient, sweepPoolFees.
- 06pass
The code cannot changeNot a proxy, no DELEGATECALL, no SELFDESTRUCT.
- 07pass
Only the PoolManager can call itEach callback refused a call that did not come from the PoolManager.
- 08pass
Track record9 pools over 48 days.
Measured at block 93,088,420. A hook with an owner or a dynamic fee can behave differently later; scan again before a large trade.
What the address allows
A v4 hook's permissions are the last fourteen bits of its address. The PoolManager calls only what they switch on.
address & 0x3fff0x2044 · 10000001000100
- bit 13Before initialize
- bit 12After initialize
- bit 11Before add liquidity
- bit 10After add liquidity
- bit 9Before remove liquidity
- bit 8After remove liquidity
- bit 7Before swap
- bit 6After swap
- bit 5Before donate
What it did to a real swap
A small swap each way and a liquidity round trip, run through the PoolManager and this hook inside a call that is never sent. The pool fee is expected; anything else missing is the hook.
WETH / FUGUI
fee 0%- Swap WETH → FUGUIhook takes 1%
- Swap FUGUI → WETHno liquidity above the price
- Add, then remove liquiditycame back whole
pool 0xe73c4547d17a4b2fe732890ab11e5b62d5f1eab41dc09c963b157bfc2c17dabd
PONS / TAM
fee 0%- Swap PONS → TAMhook takes 1%
- Swap TAM → PONShook takes 1%
- Add, then remove liquiditycame back whole
pool 0x035610d8f7e62286ebc0b8ec37d008581ea8706168b74aba7c33a84220d38fd4
Read from the bytecode
- Code size
- 17,631 bytes
- Owner
- 0x16F4681314ddfE307c13584BEA336008419886C5
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 11
- Callbacks open to anyone
- none
Its functions, uncensored
Selectors found in the dispatcher, named from the public signature database. Red ones are what an owner usually keeps for itself.
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x359b4f30 pendingFees
- 0x54faf9c3 setFeeSweepOperator
- 0x575e24b4 beforeSwap
bit 4
After donate
bit 3Before swap returns deltabit 2After swap returns deltabit 1After add returns deltabit 0After remove returns delta- Before initialize. Runs once, when a pool is created.
- After swap. Runs after every swap.
- After swap returns delta. Can take part of what you get out of every swap.
0x5bb47808
setFactory
0x5cbe8117 rescuePoolFees0x64df049e protocolFeeRecipient0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x76e16bb3 registerCurveTerms0x79ba5097 acceptOwnership0x89a69bd8 currentFeePolicy0x8a36a6bb feeSweepOperator0x8da5cb5b owner0x9040f866 protocolFeeShareBps0x90addc1e maxInternalPriceImpactBps0x91dd7346 unlockCallback0x94b4d8cc curveTerms0x9f03129b collectBondCashback0x9f063efc afterAddLiquidity0xabcfa192 registerPool0xad091230 launches0xaea264df pendingCreatorFees0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc45a0155 unknown0xc4b7de97 feeEscrow0xc4e833ce getHookPermissions0xcc233486 pendingBondCashback0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe30c3978 pendingOwner0xe521cb92 setProtocolFeeRecipient0xea26abcf hookFeeBps0xebe51768 sweepPoolFees0xed8ef7a3 setCreatorFeeRecipient0xf2fde38b transferOwnership