Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,238,898
0xF8EA…a044
The eight checks
5 pools use this hook, the first one 33 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.
- 02caution
What it takes from a swapIt takes 5% of each swap 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 0x8f2a6810D3a0F7E0A147a5Bb50cBfcEbB3E60546. Owner-style functions: sweep, setFactory, setDistributor, setHookFeeBps, setProtocolFeeRecipient.
- 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 record5 pools over 32 days.
Measured at block 93,238,898. 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.
FOURTH / DUN32
fee 0%- Swap FOURTH → DUN32hook takes 1%
- Swap DUN32 → FOURTHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0xca78e10b49f7cdfff4db550dfcc26393b8fed62bfc2a17f8f8d67685e3e6886a
DUN32 / THIRD
fee 0%- Swap DUN32 → THIRDhook takes 5%
- Swap THIRD → DUN32hook takes 5%
- Add, then remove liquiditycame back whole
pool 0x1185b38bdea26d2672b21ec57e672d57315ead29eef72a179792a79f3feac3c0
Read from the bytecode
- Code size
- 7,465 bytes
- Owner
- 0x8f2a6810D3a0F7E0A147a5Bb50cBfcEbB3E60546
- 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.
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x359b4f30 pendingFees
- 0x4aef4070 sweep
- 0x575e24b4 beforeSwap
- 0x5bb47808
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.
setFactory
0x64df049e protocolFeeRecipient0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x75619ab5 setDistributor0x79ba5097 acceptOwnership0x89a69bd8 currentFeePolicy0x8da5cb5b owner0x9f063efc afterAddLiquidity0xad091230 launches0xaf127937 registerPool0xb47b2fb1 afterSwap0xb5af6caa poolKeyOf0xb6a8b0fa beforeDonate0xbfe10928 distributor0xbfe7af83 setHookFeeBps0xc45a0155 unknown0xc4b7de97 feeEscrow0xc4e833ce getHookPermissions0xc8eaa792 pendingCreatorTax0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe30c3978 pendingOwner0xe521cb92 setProtocolFeeRecipient0xea26abcf hookFeeBps