Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,364,225
0x3a9B…20CC
The eight checks
4 pools use this hook, the first one 43 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.
- 02caution
What it takes from a swapIt takes 1.25% 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 0.25%, written in the pool key.
- 05caution
No one holds the switchOwned by 0x4D8E431f3d93B57E3CDd3FA9cc4e6D248678933B. Owner-style functions: transferOwnership, setDeployer, setDividendFeeHelper.
- 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 42 days.
Measured at block 93,364,225. 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.
ARENA / alphatest2
fee 0.25%- Swap ARENA → alphatest2hook takes 1.25%
- Swap alphatest2 → ARENAhook takes 1.25%
- Add, then remove liquiditycame back whole
pool 0x5929cdf30f92b7dad4d56eda2b40e908de9e116adefd0c25f8ef1721fa090e3a
WETH / alphatest
fee 0.25%- Swap WETH → alphatesthook takes 0.25%
- Swap alphatest → WETHhook takes 0.25%
- Add, then remove liquiditycame back whole
pool 0xe618588821e51007331411f20e792d5bf04cfba83e4f9d36232bdbd60a78cddf
Read from the bytecode
- Code size
- 7,216 bytes
- Owner
- 0x4D8E431f3d93B57E3CDd3FA9cc4e6D248678933B
- 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.
- 0xc4e833ce getHookPermissions
- 0xdc4c90d3 poolManager
- 0xdc98354e beforeInitialize
- 0xe1b4af69 afterDonate
- 0xe30c3978 pendingOwner
- 0xf2fde38b transferOwnership
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.
0x8da5cb5b
owner
0x9f063efc afterAddLiquidity0xa34b5ee8 setDeployer0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x79ba5097 acceptOwnership0x7ea9e98c MAX_TOTAL_FEE_PPM0x8b75cc27 setDividendFeeHelper0x0e36b4c3 dividendFeeHelper0x21d0ee70 beforeRemoveLiquidity0x259982e5 beforeAddLiquidity0x50c358a4 isDeployer0x575e24b4 beforeSwap