Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,891,609
0xEfe6…6aEc
The eight checks
2347 pools use this hook, the first one 101 d ago.
- 01caution
Permissions that touch your moneyThe address enables before remove liquidity, before swap returns delta, 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 1.00% on top of the pool fee.
- 03n/a
LPs can get outClosed to outside LPs: only the hook's own liquidity is in the pool.
- 04pass
The fee is the feeA fixed fee of 0%, written in the pool key.
- 05caution
No one holds the switchOwned by 0xD2DeFbd13aFF22D6989E8C14B4517Ec308079E91. Owner-style functions: setTreasury, transferOwnership, claim, updateCreator, collectPlatform, sweep.
- 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 record2347 pools over 101 days.
Measured at block 92,891,609. 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 & 0x3fff0x2aec · 10101011101100
- 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.
ETH / test
fee 0%- Swap ETH → testhook takes 1.00%
- Swap test → ETHno liquidity above the price
- Add, then remove liquiditydeposit refused: NotFactory
pool 0xf238a10550d7987a5e09f11f5b2904ada3cd16084a7e4c1cdb091322162a5ff8
ETH / jeff
fee 0%- Swap ETH → jeffhook takes 1.00%
- Swap jeff → ETHno liquidity above the price
- Add, then remove liquiditydeposit refused: NotFactory
pool 0x811ef1bd7625b015d3141ee3572c761b295a9b42cfb88ae70e306a48a583a8aa
Read from the bytecode
- Code size
- 11,383 bytes
- Owner
- 0xD2DeFbd13aFF22D6989E8C14B4517Ec308079E91
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 7
- 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.
- 0xf0f44260 setTreasury
- 0xf2fde38b transferOwnership
- 0xf7c8d634 tab
- 0xe1b4af69 afterDonate
- 0xe30c3978 pendingOwner
- 0xd73792a9 FEE_DENOMINATOR
- 0xdc4c90d3
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.
- Before add liquidity. Can refuse a deposit, or only let some addresses provide liquidity.
- Before remove liquidity. Can refuse a withdrawal. LPs may not get out.
- Before swap. Runs before every swap. On a dynamic-fee pool it can set the fee each time.
- After swap. Runs after every swap.
- Before donate. Runs before a donation to LPs.
- Before swap returns delta. Can take part of what you put into a swap, or change how much is swapped.
- After swap returns delta. Can take part of what you get out of every swap.
poolManager
0xdc98354e beforeInitialize0xe1a45218 BPS_DENOMINATOR0xc45a0155 unknown0xc4e833ce getHookPermissions0xd1ec4cf6 seeded0xbbccad03 platformTab0xbd66528a claim0x9f063efc afterAddLiquidity0xa795c647 currentFeeRate0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0x8da5cb5b owner0x91dd7346 unlockCallback0x92f6576e MAX_FEE_RATE0x79ba5097 acceptOwnership0x84970a30 register0x6ba1c9e6 firstBuyExemptionSpent0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x3b0bc87e updateCreator0x575e24b4 beforeSwap0x61d027b3 treasury0x259982e5 beforeAddLiquidity0x2da9dc98 collectPlatform0x07ef2190 poolConfigs0x1808eeb8 pending0x21d0ee70 beforeRemoveLiquidity0x248eb4ec sweep