Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,060,020
0x082c…C0CC
The eight checks
11 pools use this hook, the first one 39 d ago.
- 01caution
Permissions that touch your moneyThe address enables before swap returns delta, 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 0.50% on top of the pool fee.
- 03caution
LPs can get outTaking liquidity straight back out lost 0.10%.
- 04pass
The fee is the feeA fixed fee of 1%, written in the pool key.
- 05caution
No one holds the switchOwned by 0xeA6Af6c49cdf4654bCC72007d2095121BB2812A9. Owner-style functions: upgradeToAndCall, setPoolFeePips, collect, UPGRADE_INTERFACE_VERSION, transferOwnership, setRegistrar.
- 06fail
The code cannot changeIt is a proxy. The code that runs lives at 0x05e2C457bf002652998231706D6719310FdFc4cA.
- 07pass
Only the PoolManager can call itEach callback refused a call that did not come from the PoolManager.
- 08pass
Track record11 pools over 39 days.
Measured at block 93,060,020. 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 & 0x3fff0x00cc · 00000011001100
- 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.
LGA / HOTDOG
fee 1%- Swap LGA → HOTDOGhook takes 0.50%
- Swap HOTDOG → LGAtoo little liquidity to measure
- Add, then remove liquiditylost 0.10%
pool 0x46802938ca1b8c09e5d9d93ad640c67254b624cfd606142e5f1163cfb72a7dd2
WETH / SIT
fee 1%- Swap WETH → SITtoo little liquidity to measure
- Swap SIT → WETHhook takes 0.46%
- Add, then remove liquiditycame back whole
pool 0xae63560818c041431828ace34acc2a4f0998a046b1740415fca67b058d36db20
Read from the bytecode
- Code size
- 11,728 bytes
- Owner
- 0xeA6Af6c49cdf4654bCC72007d2095121BB2812A9
- Proxy
- yes, code at 0x05e2C457bf002652998231706D6719310FdFc4cA
- DELEGATECALL
- present
- SELFDESTRUCT
- absent
- Outside calls
- 4
- 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.
- 0x196ab777 feeRecipientOf
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x2b20e397 registrar
- 0x359b4f30 pendingFees
- 0x4dbeb3e3
bit 4
After donate
bit 3Before swap returns deltabit 2After swap returns deltabit 1After add returns deltabit 0After remove returns delta- 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.
MAX_FEE_PIPS
0x4f1ef286 upgradeToAndCall0x52d1902d proxiableUUID0x575e24b4 beforeSwap0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x79ba5097 acceptOwnership0x7c2dfc36 setPoolFeePips0x7ceab3b1 guard0x839197e3 collect0x8da5cb5b owner0x8fd48aff registerPool0x91dd7346 unlockCallback0x9759a1a0 getObservation0x9f063efc afterAddLiquidity0xa0d65b6b feePipsOf0xaae49d70 PIPS_DENOMINATOR0xad3cb1cc UPGRADE_INTERFACE_VERSION0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc0c53b8b initialize0xc4e833ce getHookPermissions0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe034fbef increaseObservationCardinalityNext0xe1b4af69 afterDonate0xe26723f0 consultTick0xe30c3978 pendingOwner0xe7a39528 feePipsFor0xf2fde38b transferOwnership0xf96f97f2 observe0xfaab9d39 setRegistrar