Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,889,457
0x0b1D…68cc
The eight checks
101 pools use this hook, the first one 108 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 1.00% on top of the pool fee.
- 03pass
LPs can get outLiquidity added and removed in the same block came back whole.
- 04caution
The fee is the feeIts pools use a dynamic fee that the hook sets before every swap. It stands at 1% now and can change.
- 05caution
No one holds the switchOwned by 0x4e59b44847b379578588920cA78FbF26c0B4956C. Owner-style functions: transferOwnership.
- 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 record101 pools over 108 days.
Measured at block 92,889,457. 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 & 0x3fff0x28cc · 10100011001100
- 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.
DEGNSW / WETH
fee dynamic, now 0%- Swap DEGNSW → WETHno liquidity below the price
- Swap WETH → DEGNSWhook takes 1.00%
- Add, then remove liquiditycame back whole
pool 0x7a2d1fc8d9cd2d44780d522184454c5f9d1eec38fe8d9ecc2b18530281646bab
WETH / AIR
fee dynamic, now 1%- Swap WETH → AIRnothing taken
- Swap AIR → WETHnothing taken
- Add, then remove liquiditycame back whole
pool 0x3315f246fc5adb702c9a70515ae2632418cd3d5cddb3328f4d6c2849486fb67e
Read from the bytecode
- Code size
- 14,216 bytes
- Owner
- 0x4e59b44847b379578588920cA78FbF26c0B4956C
- 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.
- 0x015e3c29 initializeMevModule
- 0x01ffc9a7 supportsInterface
- 0x07eda3da clankerIsToken0
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
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.
- 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.
0x2b887e0f
mevModuleEnabled
0x2c78f493 clankerFee0x3fc48eba MAX_LP_FEE0x3fc8cef3 weth0x4468979e locker0x4c2b2876 initializePoolOpen0x564d49e7 initializePool0x575e24b4 beforeSwap0x58f8cd54 mevModuleOperational0x66f87cfd PROTOCOL_FEE_FIXED0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x7f5464f4 mevModuleSetFee0x8da5cb5b owner0x949d32e0 MAX_MEV_LP_FEE0x9f063efc afterAddLiquidity0xb0e21e8a protocolFee0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xbdf22863 mevModule0xc45a0155 unknown0xc4e833ce getHookPermissions0xccc8dc43 MAX_MEV_MODULE_DELAY0xd73792a9 FEE_DENOMINATOR0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xee4d96cf poolCreationTimestamp0xf2fde38b transferOwnership0xf732b64e pairedFee