Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,952,016
0xe95C…F8c4
The eight checks
50 pools use this hook, the first one 42 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.
- 04caution
The fee is the feeIts pools use a dynamic fee that the hook sets before every swap. It stands at 5% now and can change.
- 05caution
No one holds the switchOwned by 0x6d8b2c6fa041Db6aFf09Aa5593B99A1C5cDf615c. Owner-style functions: setDefaultFee, setProtocolFeeRate, setPoolFee, setFeeRecipient, transferOwnership.
- 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 record50 pools over 41 days.
Measured at block 92,952,016. 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 & 0x3fff0x38c4 · 11100011000100
- 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.
COPPERINU / USDG
fee dynamic, now 3%- Swap COPPERINU → USDGhook takes 1.00%
- Swap USDG → COPPERINUhook takes 1%
- Add, then remove liquiditycame back whole
pool 0xa506e278a9ee6407b4af5d5161eea8f77b88bd432391a384917a56dd58152a61
COPPERINU / SLVR
fee dynamic, now 5%- Swap COPPERINU → SLVRhook takes 1%
- Swap SLVR → COPPERINUhook takes 1%
- Add, then remove liquiditycame back whole
pool 0xa528ef00af52812e850390e93b6051dc5a40d0ec491cfb59d2fc6e25f100e8e9
Read from the bytecode
- Code size
- 14,116 bytes
- Owner
- 0x6d8b2c6fa041Db6aFf09Aa5593B99A1C5cDf615c
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 4
- 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.
- 0x0b35f7c0 unknown
- 0x1651fe1b unknown
- 0x1893e2a7 unknown
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x3a0d5443 setDefaultFee
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 initialize. Runs once, right after a pool is created.
- Before add liquidity. Can refuse a deposit, or only let some addresses provide liquidity.
- Before swap. Runs before every swap. On a dynamic-fee pool it can set the fee each time.
- After swap. Runs after every swap.
- After swap returns delta. Can take part of what you get out of every swap.
0x46904840
feeRecipient
0x4ef1e11b feeMode0x4fcc1def DEFAULT_FEE0x50536fcf unknown0x575e24b4 beforeSwap0x58cdaf1a unknown0x58f85880 protocolFeeRate0x59675afa removePoolFee0x5a6c72d0 defaultFee0x632c0207 unknown0x69516b74 getFee0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x7eac22b5 unknown0x8da5cb5b owner0x9f063efc afterAddLiquidity0xa9de2ff7 setProtocolFeeRate0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xbe791d7f unknown0xc32aeabc unknown0xc4e833ce getHookPermissions0xd2c46622 unknown0xda2076d9 setPoolFee0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe460a100 unknown0xe7233049 unknown0xe74b981b setFeeRecipient0xf2fde38b transferOwnership0xfe84ba2c unknown