Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,976,545
0xb317…30Cc
The eight checks
21 pools use this hook, the first one 66 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 0.30% 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 0% now and can change.
- 05caution
No one holds the switchNo owner() but it has setStakingVault, setStakingVaultFactory, setProtocolFeeRatio.
- 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 record21 pools over 65 days.
Measured at block 92,976,545. 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 & 0x3fff0x30cc · 11000011001100
- 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.
ETH / SLEUTH
fee dynamic, now 0%- Swap ETH → SLEUTHhook takes 0.30%
- Swap SLEUTH → ETHhook takes 0.30%
- Add, then remove liquiditycame back whole
pool 0x6f8b82d7506468eda9b86e62d2223c29af86a074f8073f1abd43083be874fa3b
Read from the bytecode
- Code size
- 19,382 bytes
- Owner
- none found
- 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.
- 0xef01a4d8 CALL_FEE_CHANGE
- 0xf5e3bf84 setStakingVault
- 0xf9cb6335 HOOK_CONFIG_VERSION
- 0xdc98354e beforeInitialize
- 0xe1b4af69 afterDonate
- 0xec120a00 MAX_OBSERVERS
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.
- After initialize. Runs once, right after 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.
0xc662ef93
stakingVaultFactory
0xc744e2cd PROTOCOL_FLOOR_PIPS0xd595408a getPoolState0xd90a51cb CALC_GAS_STIPEND0xdc4c90d3 poolManager0xb6a8b0fa beforeDonate0xc192a5d0 previewFee0xc4e833ce getHookPermissions0xa852aaa4 observe0xad5c4648 WETH0xb47b2fb1 afterSwap0x93ed10f0 MAX_HOOK_FEE0x9ad30364 MAX_ABS_TICK_MOVE0x9c1f9c03 getCurrentFee0x9f063efc afterAddLiquidity0x9fb8b0d3 MAX_HOOKDATA_BYTES0x73405d7a DEFAULT_FIXED_FEE0x7a27d9f6 protocolFeeRatio0x829cc4b1 OBSERVER_GAS_BUDGET0x6c3531e5 ACCUMULATOR_CAP0x6fe7e6eb afterInitialize0x7046c199 BC_TOKEN_FACTORY0x42b11e29 DEFAULT_LP_SHARE_BPS0x575e24b4 beforeSwap0x6075c6f6 MAX_SNIPER_WINDOW0x6b743acc MAX_FEE_CALCULATORS0x6c2bbe7e afterRemoveLiquidity0x377bdcc8 setStakingVaultFactory0x3f5df826 DECAY_WINDOW0x4273601c factoryOwner0x24ece7c7 CALL_AFTER_SWAP0x259982e5 beforeAddLiquidity0x2807bab7 factoryTreasury0x048c8654 setProtocolFeeRatio0x17f58ccc getVolatility0x2177b413 registerPool0x21d0ee70 beforeRemoveLiquidity0x24183d51 SNIPER_MAX_FEE