Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,998,576
0x8e99…a044
The eight checks
16 pools use this hook, the first one 80 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 0x0815A4881f9c4073a70fdF00600EbA54c5a5baAa. Owner-style functions: setBuybackEnabled, sweepPoolFees, setBuybackBurnBps, setFeeSweepOperator, setFactory, rescuePoolFees.
- 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 record16 pools over 80 days.
Measured at block 92,998,576. 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.
SPY / MEMESTOCK
fee 0%- Swap SPY → MEMESTOCKhook takes 1%
- Swap MEMESTOCK → SPYhook takes 1%
- Add, then remove liquiditycame back whole
pool 0xf6c3aa83cc9444c2cd87aa4ec951b4f7304bd08fd49cd76424ecd7135ebe24b1
USDG / USDG
fee 0%- Swap USDG → USDGhook takes 1%
- Swap USDG → USDGhook takes 1%
- Add, then remove liquiditycame back whole
pool 0x7829da9b486662baa17a47fcb653cdfae3caf609ae190a152c8f2c680dbeb13c
Read from the bytecode
- Code size
- 15,167 bytes
- Owner
- 0x0815A4881f9c4073a70fdF00600EbA54c5a5baAa
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 16
- 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
- 0x2ce8b029 setBuybackEnabled
- 0x359b4f30 pendingFees
- 0x3d61055e sweepPoolFees
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.
0x41541148
registerPool
0x48332680 setBuybackBurnBps0x49127e2a buybackBurnBps0x54faf9c3 setFeeSweepOperator0x575e24b4 beforeSwap0x5bb47808 setFactory0x5cbe8117 rescuePoolFees0x64df049e protocolFeeRecipient0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x7862505c setBuybackVault0x79ba5097 acceptOwnership0x89a69bd8 currentFeePolicy0x8a36a6bb feeSweepOperator0x8da5cb5b owner0x9040f866 protocolFeeShareBps0x90addc1e maxInternalPriceImpactBps0x91dd7346 unlockCallback0x9f063efc afterAddLiquidity0xad091230 launches0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xb89eddab setMaxInternalPriceImpactBps0xbfe7af83 setHookFeeBps0xc45a0155 unknown0xc4b7de97 feeEscrow0xc4e833ce getHookPermissions0xc8eaa792 pendingCreatorTax0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe30c3978 pendingOwner0xe356a181 pendingBuyback0xe521cb92 setProtocolFeeRecipient0xea26abcf hookFeeBps0xed8ef7a3 setCreatorFeeRecipient0xf1f5c993 buybackVault0xf2fde38b transferOwnership