Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,950,085
0x3f27…E8cC
The eight checks
24 pools use this hook, the first one 89 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.
- 05pass
No one holds the switchNo owner and no admin functions found.
- 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 record24 pools over 89 days.
Measured at block 92,950,085. 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.
PONZI / PONS
fee dynamic, now 1%- Swap PONZI → PONSnothing taken
- Swap PONS → PONZInothing taken
- Add, then remove liquiditycame back whole
pool 0x2a2411068c338321f7bfecb0dac6f6cd3c36aa3a121aef71bc63c647e700e35d
HUMANITY / OPENAIx1L
fee dynamic, now 0%- Swap HUMANITY → OPENAIx1Lno liquidity below the price
- Swap OPENAIx1L → HUMANITYhook takes 1.00%
- Add, then remove liquiditycame back whole
pool 0x7f194006cc0aa8c7696aa560c21ed569cbfbebf34c4e353fedd12bec6814d824
Read from the bytecode
- Code size
- 12,831 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 16
- 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
- 0x2b887e0f
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.
mevModuleEnabled
0x2c78f493 clankerFee0x3fc48eba MAX_LP_FEE0x3fc8cef3 weth0x4468979e locker0x4c2b2876 initializePoolOpen0x4eb5313d poolExtensionSetup0x564d49e7 initializePool0x575e24b4 beforeSwap0x58f8cd54 mevModuleOperational0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x7cb6ac0d MAX_PROTOCOL_FEE_NUMERATOR0x7f5464f4 mevModuleSetFee0x949d32e0 MAX_MEV_LP_FEE0x9f063efc afterAddLiquidity0xac3e6ec9 poolExtension0xb0e21e8a protocolFee0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xbdf22863 mevModule0xc37fb4da poolExtensionAllowlist0xc45a0155 unknown0xc4e833ce getHookPermissions0xccc8dc43 MAX_MEV_MODULE_DELAY0xd73792a9 FEE_DENOMINATOR0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe98a4297 _runPoolExtensionHelper0xee4d96cf poolCreationTimestamp0xf5197d58 protocolFeeNumerator0xf732b64e pairedFee