Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,326,758
0xd9C0…a0Cc
The eight checks
4 pools use this hook, the first one 3 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.
- 02caution
What it takes from a swapIt takes 3.00% 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 0xDe5350d263f346E65A1b6eeD68d0080043714734. Owner-style functions: setPaused, paused, claimCreatorFees, setStartTick, transferOwnership, transferFrom.
- 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.
- 08caution
Track record4 pools, first seen 2 days ago.
Measured at block 93,326,758. 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 & 0x3fff0x20cc · 10000011001100
- 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.
AP / AAPL
fee 0%- Swap AP → AAPLno liquidity below the price
- Swap AAPL → APhook takes 2.00%
- Add, then remove liquiditycame back whole
pool 0x6b4653a098d627296ec83b60f6bfa048b5deda919da780b21c6253cab746cb7c
AAPL / 0XGM
fee 0%- Swap AAPL → 0XGMhook takes 3.00%
- Swap 0XGM → AAPLno liquidity above the price
- Add, then remove liquiditycame back whole
pool 0x22b6e28ba7bc41762407291db14caae6c0104bc855711468e2c8b9a7a9cd8ffc
Read from the bytecode
- Code size
- 20,069 bytes
- Owner
- 0xDe5350d263f346E65A1b6eeD68d0080043714734
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 12
- 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.
- 0x036a7535 MIN_START_TICK
- 0x0797ac62 unknown
- 0x0885f732 poolConfig
- 0x0cfb82c0 MAX_START_TICK
- 0x138ff606 unknown
- 0x16c38b3c setPaused
- 0x1e159476 unknown
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 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.
0x21d0ee70
beforeRemoveLiquidity
0x259982e5 beforeAddLiquidity0x27cca59f launchCount0x46ca626b TICK_SPACING0x4d4ec187 subnames0x575e24b4 beforeSwap0x5c975abb paused0x5e3f2727 LP_FEE0x5f03528d unknown0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x7244b312 launchIndexPlusOne0x79ba5097 acceptOwnership0x8652edf9 poolKeyOf0x8da5cb5b owner0x90166851 launches0x91dd7346 unlockCallback0x98aab22e startTick0x9e08d88d unknown0x9f063efc afterAddLiquidity0xa844a134 MAX_CREATOR_FEE_BPS0xb098d551 unknown0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xb947efcb claimCreatorFees0xc4e833ce getHookPermissions0xc502ccb4 setStartTick0xc50497ae SUPPLY0xc523614c unknown0xce970b3d unknown0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe30c3978 pendingOwner0xe88791db BASE_FEE_BPS0xf2fde38b transferOwnership0xf742a143 unknown0xf7cca89f creatorFeesOwed0x02669b52 launchpad0x03ee438c metadataURI0x06fdde03 name0x095ea7b3 approve0x18160ddd totalSupply0x23b872dd transferFrom0x313ce567 decimals0x70a08231 balanceOf0x95d89b41 symbol0xa9059cbb transfer0xdd62ed3e allowance