Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,238,958
0x2AC2…A888
The eight checks
5 pools use this hook, the first one 74 d ago.
- 01caution
Permissions that touch your moneyThe address enables before swap returns delta. The hook is allowed to take; the next two checks measure whether it does.
- 02n/a
What it takes from a swapNo pool with liquidity to swap through yet.
- 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 0xCA63E46e13a2A1575132e77cb106c670D41b4a34. Owner-style functions: transferOwnership, updateBooks, updater, withdrawer, setUpdater, setPairConfig.
- 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 record5 pools over 74 days.
Measured at block 93,238,958. 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 & 0x3fff0x2888 · 10100010001000
- 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 / MSTR
fee 0%- Swap USDG → MSTRno liquidity at the current price
- Swap MSTR → USDGno liquidity at the current price
- Add, then remove liquiditydeposit refused: LiquidityNotAllowed
pool 0x30fbf71a8a27e9d30549132fbeb32aeef7a9b8372e751478654e7deb9ad2e3d2
Read from the bytecode
- Code size
- 19,386 bytes
- Owner
- 0xCA63E46e13a2A1575132e77cb106c670D41b4a34
- 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
- 0xf45346dc deposit
- 0xf777ce22 aggregatorHookVersion
- 0xe527edab swapExactInDirect
- 0xeced5526 SCALE
- 0xf1a8151c pairConfig
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 swap. Runs before every swap. On a dynamic-fee pool it can set the fee each time.
- Before swap returns delta. Can take part of what you put into a swap, or change how much is swapped.
0xe1b4af69
afterDonate
0xe1cd908e updateBooks0xe30c3978 pendingOwner0xdc98354e beforeInitialize0xdf034cd0 updater0xdf8c4cc1 swapExactOutDirect0xcd272714 quote0xcdc18424 withdrawer0xdc4c90d3 poolManager0xb8902ae3 NUM_TICKS0xc0d25871 quoteDirect0xc4e833ce getHookPermissions0x9f063efc afterAddLiquidity0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0x8da5cb5b owner0x9d54f419 setUpdater0x7f5a7c7b hook0x8aece7ac getBookSideRaw0x8cde38ab setPairConfig0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x79ba5097 acceptOwnership0x6672badb PIPS0x69328dec withdraw0x6c2bbe7e afterRemoveLiquidity0x490c98f5 tokenJar0x575e24b4 beforeSwap0x32cc3a32 getBookSide0x3f7d1179 pollTokenJar0x48d8b0ba getReserves0x28c32069 getEffectiveLiquidity0x2c2efcac protocolFeeFlags0x2d910fb4 pseudoTotalValueLocked0x1ce4c78b protocolFeeMultiplier0x21d0ee70 beforeRemoveLiquidity0x259982e5 beforeAddLiquidity0x01ffc9a7 supportsInterface0x0d174c24 setWithdrawer