Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,890,342
0xd7d0…E0cc
The eight checks
203 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 1% 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 0xDf769057eB42b27Bd7dD4C8643779f0DFe49a6A2. Owner-style functions: setProtocolRecipient, withdrawFlywheel, setOwner, withdrawHolders, setFactory, setPoolConfig.
- 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 record203 pools over 39 days.
Measured at block 92,890,342. 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 & 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.
Paper / PAPER
fee 0%- Swap Paper → PAPERno liquidity below the price
- Swap PAPER → Paperhook takes 1.00%
- Add, then remove liquiditycame back whole
pool 0x401d74f21c692a5616aabc977995c691d483303c53e1ab41a659b352843b5423
ETH / ANON
fee 0%- Swap ETH → ANONhook takes 1.00%
- Swap ANON → ETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0x9dc1ccc9125b12154f34beea33d1efd4b358fa6e0f4b39cf082b31bd52a83a72
Read from the bytecode
- Code size
- 10,081 bytes
- Owner
- 0xDf769057eB42b27Bd7dD4C8643779f0DFe49a6A2
- 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.
- 0x07ba8a54 setProtocolRecipient
- 0x0885f732 poolConfig
- 0x0e7f955a withdrawFlywheel
- 0x0f04ba67 isFactory
- 0x13af4035 setOwner
- 0x30040054 poolIdOf
- 0x32c961d9
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.
toId
0x575e24b4 beforeSwap0x5bcb0708 withdrawHolders0x62308e85 POOL_MANAGER0x66ee464c isHoldersOperator0x71013c10 setFactory0x71ed2ad3 pending0x760b6aa8 setPoolConfig0x79167dd0 setCreatorRecipient0x8b9cacaf isBurnOperator0x8da5cb5b owner0x91dd7346 unlockCallback0x941f5d25 protocolRecipient0x9893f5c6 withdrawCreator0xa0258fa3 banked0xa8231bf1 creatorRecipientOverride0xa9045722 withdrawBurn0xabf8d9f4 isFlywheelOperator0xb148440f accrued0xb47b2fb1 afterSwap0xb633e4cd claimBalance0xbc53731a setOperator0xd55be8c6 MAX_FEE_BPS0xdc98354e beforeInitialize0xea3f7110 withdrawProtocol0xf3e0eee4 registerPool