Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,418,579
0xB6C4…EaC4
The eight checks
3 pools use this hook, the first one 21 d ago.
- 01caution
Permissions that touch your moneyThe address enables before remove liquidity, 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 0.88% 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 0x8F70fAED558b299c864e9d286223c1850d46044a. Owner-style functions: claimCreator, setTreasurySweeper, setFactory, transferOwnership, sweepToTreasury.
- 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 record3 pools over 21 days.
Measured at block 93,418,579. 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 & 0x3fff0x2ac4 · 10101011000100
- 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 / FARM
fee dynamic, now 0%- Swap USDG → FARMhook takes 0.30%
- Swap FARM → USDGhook takes 0.30%
- Add, then remove liquiditydeposit refused: NotFarmManager
pool 0x7c53a0267ce66c46d3b59891c80818eb4527d1b8c43e6a254b9702c3d1de4b8f
USDG / AAPL
fee dynamic, now 0%- Swap USDG → AAPLhook takes 0.88%
- Swap AAPL → USDGtoo little liquidity to measure
- Add, then remove liquiditydeposit refused: NotFarmManager
pool 0x9a86616ad3ab76ca7e14c737c89f1d14ab8a96aac5e2da14020599bfe32802b5
Read from the bytecode
- Code size
- 15,987 bytes
- Owner
- 0x8F70fAED558b299c864e9d286223c1850d46044a
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 3
- 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.
- 0x01358ba0 register
- 0x0d13f9f1 startObserving
- 0x10f908bd farms
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x3363b7d9
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 add liquidity. Can refuse a deposit, or only let some addresses provide liquidity.
- Before remove liquidity. Can refuse a withdrawal. LPs may not get out.
- Before swap. Runs before every swap. On a dynamic-fee pool it can set the fee each time.
- After swap. Runs after every swap.
- After swap returns delta. Can take part of what you get out of every swap.
accumulators
0x33a0e8b7 claimCreator0x3c4c3083 legs0x470457c2 creatorFees0x47473b00 consult0x47a06c7c OPENING_BELL0x4b2d07cf farmManager0x4d0f3f0c setTreasurySweeper0x575e24b4 beforeSwap0x5bb47808 setFactory0x5e518818 averageTick0x608a74e1 shutFee0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x79ba5097 acceptOwnership0x7f635cc0 MAX_TOTAL_FEE0x88a640ea CHECKPOINT_SPACING0x8da5cb5b owner0x9db55f5e treasurySweeper0x9f063efc afterAddLiquidity0xab2db3cd holidays0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xb762ed46 treasuryFees0xc45a0155 unknown0xc4e833ce getHookPermissions0xc606e720 CHECKPOINTS0xcaa93ee8 currentFee0xcf8513a1 corporateActions0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe30c3978 pendingOwner0xf2fde38b transferOwnership0xf31d62d5 sweepToTreasury