Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,296,923
0x52FF…e044
The eight checks
4 pools use this hook, the first one 11 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 0x5D07711893A8580Ea96e487C7680c1453792Ff59. Owner-style functions: setRevenueRegistry, setFactory, setHookFeeBps, setProtocolFeeRecipient, 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 record4 pools over 11 days.
Measured at block 93,296,923. 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.
USDG / ERT
fee 0%- Swap USDG → ERThook takes 1%
- Swap ERT → USDGhook takes 1%
- Add, then remove liquiditycame back whole
pool 0x78a9472016dbe355c47282e40f5334a3e8a9e13061bd7383bfe0629778a08b48
MOCK_ETH / EM
fee 0%- Swap MOCK_ETH → EMhook takes 1%
- Swap EM → MOCK_ETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0xc04b702076e63ab3a2da093a30435d0531ad5ba010ac4a3fd08f0a9aeed0728d
Read from the bytecode
- Code size
- 7,366 bytes
- Owner
- 0x5D07711893A8580Ea96e487C7680c1453792Ff59
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 5
- 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.
- 0x124b530f setRevenueRegistry
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x49127e2a buybackBurnBps
- 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
0x64df049e protocolFeeRecipient0x6c2bbe7e afterRemoveLiquidity0x6c801033 registerPool0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x77e2a7a8 revenueRegistry0x79ba5097 acceptOwnership0x89a69bd8 currentFeePolicy0x8da5cb5b owner0x9040f866 protocolFeeShareBps0x90addc1e maxInternalPriceImpactBps0x9f063efc afterAddLiquidity0xad091230 launches0xb47b2fb1 afterSwap0xb5fb1241 accruedRevenue0xb6a8b0fa beforeDonate0xbfe7af83 setHookFeeBps0xc45a0155 unknown0xc4e833ce getHookPermissions0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe03a8ce0 reservedRevenue0xe1b4af69 afterDonate0xe30c3978 pendingOwner0xe521cb92 setProtocolFeeRecipient0xea26abcf hookFeeBps0xf2fde38b transferOwnership