Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,948,979
0xFc10…4880
The eight checks
45 pools use this hook, the first one 109 d ago.
- 01pass
Permissions that touch your moneyNone of the permissions that let a hook take from swaps or from LPs are switched on.
- 02caution
What it takes from a swapIt takes 3% of each swap on top of the pool fee.
- 03n/a
LPs can get outClosed to outside LPs: only the hook's own liquidity is in the pool.
- 04caution
The fee is the feeIts pools use a dynamic fee that the hook sets before every swap. It stands at 0% now and can change.
- 05caution
No one holds the switchOwned by 0xFBe2aA0cb012097928E220211f0ebD9F6dEe32fd. Owner-style functions: setFeeBps, setApprovedCaller, setPoolFee, setSnipeTax, 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 record45 pools over 109 days.
Measured at block 92,948,979. 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 & 0x3fff0x0880 · 00100010000000
- 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.
WETH / TITS
fee dynamic, now 0%- Swap WETH → TITShook takes 3.00%
- Swap TITS → WETHhook takes 3%
- Add, then remove liquiditydeposit refused: ExternalLPForbidden
pool 0xf467369ef5c240a8ebf3e8b97bd65e403774cbad62bfa49cd2fd6923a983418f
WETH / CIRVLE
fee dynamic, now 0%- Swap WETH → CIRVLEhook takes 3.00%
- Swap CIRVLE → WETHhook takes 3%
- Add, then remove liquiditydeposit refused: ExternalLPForbidden
pool 0x97a34e363ecf330bf3d4336a88f21b50e3482b9f0b487d521e244ac7461107ce
Read from the bytecode
- Code size
- 3,382 bytes
- Owner
- 0xFBe2aA0cb012097928E220211f0ebD9F6dEe32fd
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 0
- 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.
- 0x023b1fc9 setFeeBps
- 0x0a8ef769 poolFeeBpsOverride
- 0x0cb6d537 snipeWindow
- 0x13957cfd setApprovedCaller
- 0x21d0ee70 beforeRemoveLiquidity
- 0x21e8e593 setPoolFee
bit 4
After donate
bit 3Before swap returns deltabit 2After swap returns deltabit 1After add returns deltabit 0After remove returns delta- 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.
0x24a9d853
feeBps
0x259982e5 beforeAddLiquidity0x3ecaf600 setSnipeTax0x575e24b4 beforeSwap0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x87df06dc clearPoolFeeOverride0x8da5cb5b owner0x991ed012 effectiveFeeBps0x9f063efc afterAddLiquidity0xa6f9394d snipeTaxBps0xa71975af approvedCallers0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xd55be8c6 MAX_FEE_BPS0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe909b80e launchTime0xf2fde38b transferOwnership