Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,031,914
0xF2Bf…f044
The eight checks
14 pools use this hook, the first one 42 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.
- 04caution
The fee is the feeIts pools use a dynamic fee that the hook sets. It stands at 0% now and can change.
- 05caution
No one holds the switchOwned by 0x9Ac7d1a94131bC9e4EC9EE05A876f236236b0Ab0. Owner-style functions: transferCreator, setMainBandPosition, setOperator, setFactory, sweep, setMaxInternalPriceImpactBps.
- 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 record14 pools over 42 days.
Measured at block 93,031,914. 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 & 0x3fff0x3044 · 11000001000100
- 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 / COOK
fee dynamic, now 0%- Swap USDG → COOKhook takes 1%
- Swap COOK → USDGhook takes 1%
- Add, then remove liquiditycame back whole
pool 0x02aac8f53e4f6c503be2128b4924f999f0ffcc4e33a3fe62ea148477379e9006
ETH / VITALIK
fee dynamic, now 0%- Swap ETH → VITALIKhook takes 1%
- Swap VITALIK → ETHno liquidity above the price
- Add, then remove liquiditycame back whole
pool 0x2b24ee2084ef04628a883cadf2e41dcc7a5d69b14096a8f35e2a72be599eb156
Read from the bytecode
- Code size
- 24,251 bytes
- Owner
- 0x9Ac7d1a94131bC9e4EC9EE05A876f236236b0Ab0
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 14
- 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.
- 0x02ce01fb transferCreator
- 0x1328c45e cancelCreatorTransfer
- 0x21d0ee70 beforeRemoveLiquidity
- 0x249d39e9 BPS
- 0x259982e5 beforeAddLiquidity
- 0x2fdf13ca
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 initialize. Runs once, right after 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.
increaseCardinalityNext
0x2ffdaf89 swapFeeBps0x307ccc36 MAX_PROTOCOL_FEE_SHARE_BPS0x359b4f30 pendingFees0x4216ba24 CREATOR_TRANSFER_EXECUTION_WINDOW0x431a9caa MAX_TOTAL_FEE_BPS0x46ca626b TICK_SPACING0x47473b00 consult0x5001cd15 setMainBandPosition0x558a7297 setOperator0x575e24b4 beforeSwap0x5bb47808 setFactory0x61d027b3 treasury0x61e512f6 pendingCreator0x62c06767 sweep0x64a1cf43 baseOf0x6739bac7 setMaxInternalPriceImpactBps0x6c2bbe7e afterRemoveLiquidity0x6d70f7ae isOperator0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x791b98bc positionManager0x79ba5097 acceptOwnership0x79dc6ca1 setPeriphery0x7d1a910c setProtocolFeeShareBps0x7f787b27 MAX_SWAP_FEE_BPS0x802ebe86 proposeCreatorTransfer0x82589038 feePolicy0x8da00ae4 setSwapFeeBps0x8da5cb5b owner0x9040f866 protocolFeeShareBps0x90addc1e maxInternalPriceImpactBps0x9177c860 REPOOL_BPS0x91dd7346 unlockCallback0x9b58e0a1 claimable0x9e2a53c9 TWAP_BUY_BPS0x9f063efc afterAddLiquidity0xabe9aa87 twapBuyer0xac7e1e92 poolKeys0xad091230 launches0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xbb5b4d93 registerPool0xbbb30930 CREATOR_TRANSFER_TIMELOCK0xbe378228 PROTOCOL_FEE_BPS0xc16374ef executeCreatorTransfer0xc45a0155 unknown0xc4e833ce getHookPermissions0xc81d0598 baseIsCurrency00xc8eaa792 pendingCreatorTax0xd7b96d4e locker0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe30c3978 pendingOwner0xe673df8a operators0xf04a58a8 claimFees0xf11457c7 oracleState