Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,299,342
0x1fE2…2044
The eight checks
4 pools use this hook, the first one 31 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.
- 02caution
What it takes from a swapIt takes 3% 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%, written in the pool key.
- 05caution
No one holds the switchOwned by 0x0883d1c3a7694dDaaF560B55753b81325C477E87. Owner-style functions: setGuardMaxTicks, sweep, setFactory, setLpOperator, setDistributor, setMinLpAdd.
- 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 31 days.
Measured at block 93,299,342. 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 & 0x3fff0x2044 · 10000001000100
- 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.
LP / USER9229939383
fee 0%- Swap LP → USER9229939383hook takes 3%
- Swap USER9229939383 → LPhook takes 3%
- Add, then remove liquiditycame back whole
pool 0x5e52893cd3c079d77b128cca51ba205c4acca74c04d50c60af4eedbeb189a0eb
TESTY / USER9229939383
fee 0%- Swap TESTY → USER9229939383hook takes 1%
- Swap USER9229939383 → TESTYhook takes 1%
- Add, then remove liquiditycame back whole
pool 0x58b813875656ee87b1399cc0a826ead259da2f4b6ea27b82cb90d4943ae636a1
Read from the bytecode
- Code size
- 21,728 bytes
- Owner
- 0x0883d1c3a7694dDaaF560B55753b81325C477E87
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 16
- 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.
- 0x05505982 bandCount
- 0x137b474e exemptFromSnipeTax
- 0x16cab63f pairGuard
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x2c01ded8 MAX_BANDS_PER_POOL
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 swap. Runs after every swap.
- After swap returns delta. Can take part of what you get out of every swap.