Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,922,636
0x903b…60cc
The eight checks
59 pools use this hook, the first one 29 d ago.
- 01caution
Permissions that touch your moneyThe address enables 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.
- 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 0xD639e5538e609cf11eE5143B2447070CD0977699. Owner-style functions: setFactory, rescuePoolFees, setFee, collectPoolFees, 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 record59 pools over 29 days.
Measured at block 92,922,636. 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 & 0x3fff0x20cc · 10000011001100
- 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.
QVORTEX / musebook
fee 0%- Swap QVORTEX → musebookno liquidity below the price
- Swap musebook → QVORTEXhook takes 1.00%
- Add, then remove liquiditycame back whole
pool 0x11cd7009ee7aa258ea3c192c8c87683e65ac75da6375e0f5bb83e2de73c09b60
Read from the bytecode
- Code size
- 9,026 bytes
- Owner
- 0xD639e5538e609cf11eE5143B2447070CD0977699
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 10
- 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.
- 0x050296e9 pendingFee
- 0x1f2216fb registerPool
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x30040054 poolIdOf
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 swap. Runs before every swap. On a dynamic-fee pool it can set the fee each time.
- After swap. Runs after every swap.
- 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.
0x575e24b4
beforeSwap
0x5bb47808 setFactory0x5cbe8117 rescuePoolFees0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x7917fb9f setFee0x79ba5097 acceptOwnership0x8da5cb5b owner0x91dd7346 unlockCallback0x9f063efc afterAddLiquidity0xad091230 launches0xad7d761c unknown0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc0aa8be8 unknown0xc45a0155 unknown0xc4e833ce getHookPermissions0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xddca3f43 fee0xe1b4af69 afterDonate0xe30c3978 pendingOwner0xf261cb2b collectPoolFees0xf2fde38b transferOwnership