Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,999,293
0x21AF…6Acc
The eight checks
15 pools use this hook, the first one 53 d ago.
- 01caution
Permissions that touch your moneyThe address enables before remove liquidity, 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 5.00% 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.
- 04pass
The fee is the feeA fixed fee of 0%, written in the pool key.
- 05caution
No one holds the switchOwned by 0x4921aef409935F800DFB832e790d6fEFA2CE7EA6. Owner-style functions: transferOwnership, settleMany, setFeeRouter, claim, settle, collectPlatform.
- 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 record15 pools over 53 days.
Measured at block 92,999,293. 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 & 0x3fff0x2acc · 10101011001100
- 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.
LAUNCH / USDG
fee 0%- Swap LAUNCH → USDGtoo little liquidity to measure
- Swap USDG → LAUNCHhook takes 5.00%
- Add, then remove liquiditydeposit refused: LiquidityLocked
pool 0x77055598700139f759dd213380350a3279764bb14b4e72a0788c18a0ec858803
HOOD10 / RHOOD
fee 0%- Swap HOOD10 → RHOODhook takes 2%
- Swap RHOOD → HOOD10hook takes 2%
- Add, then remove liquiditydeposit refused: LiquidityLocked
pool 0xe64512f61ca8f33299eac6b4c97567628ed44bea1ed777c893a0f5a724c2734c
Read from the bytecode
- Code size
- 13,410 bytes
- Owner
- 0x4921aef409935F800DFB832e790d6fEFA2CE7EA6
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 8
- 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.
- 0xf2fde38b transferOwnership
- 0xfc440b92 creatorPending
- 0xff94e4f3 creatorOf
- 0xe1b4af69 afterDonate
- 0xe30c3978 pendingOwner
- 0xf29ebf61 feeRouter
- 0xdc4c90d3
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.
- 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.
poolManager
0xdc98354e beforeInitialize0xe1a08f4f platformTab0xd1ec4cf6 seeded0xd8872dbe settleMany0xc267ada4 setFeeRouter0xc45a0155 unknown0xc4e833ce getHookPermissions0xa844a134 MAX_CREATOR_FEE_BPS0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0x9f063efc afterAddLiquidity0xa3ebc6db register0xa795c647 currentFeeRate0x96c144f0 claim0x987757dd settle0x8da5cb5b owner0x91dd7346 unlockCallback0x92f6576e MAX_FEE_RATE0x79ba5097 acceptOwnership0x8352907f creatorTab0x861fbe84 acceptCreator0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x61e512f6 pendingCreator0x6672badb PIPS0x259982e5 beforeAddLiquidity0x3d74a12e PROTOCOL_FEE_PIPS0x575e24b4 beforeSwap0x2086d0b2 collectPlatform0x21d0ee70 beforeRemoveLiquidity0x249d39e9 BPS0x10ab42e0 settleSelf0x1328c45e cancelCreatorTransfer0x1808eeb8 pending0x02ce01fb transferCreator0x07ef2190 poolConfigs