Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,173,843
0x2a8d…D0ec
The eight checks
6 pools use this hook, the first one 8 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 0.10% 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 0.05%, written in the pool key.
- 05caution
No one holds the switchNo owner() but it has settleStakerRewards, claimLiability, settleFeeDistribution, setDefaultFeeRate, setGeneralFeeAllocation, settleProtocolPol.
- 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 record6 pools over 8 days.
Measured at block 93,173,843. 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 & 0x3fff0x10ec · 01000011101100
- 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 / STATICS
fee 0.05%- Swap ETH → STATICShook takes 0.10%
- Swap STATICS → ETHhook takes 0.10%
- Add, then remove liquiditycame back whole
pool 0x02344f0e509814b3711f0f96bb0fd543c7867e816f255c7aff8f6e1429541b33
Read from the bytecode
- Code size
- 17,113 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 7
- 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.
- 0xdc4c90d3 poolManager
- 0xdc98354e beforeInitialize
- 0xe1b4af69 afterDonate
- 0xe84149a3 settleStakerRewards
- 0xfc628fbe pendingProtocolPol
- 0xcb1850a8 claimLiability
bit 4
After donate
bit 3Before swap returns deltabit 2After swap returns deltabit 1After add returns deltabit 0After remove returns delta- 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 donate. Runs before a donation to LPs.
- 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.
0xd8290422
settleFeeDistribution
0xd8538be4 staticsDiamond0xd877bcf7 setDefaultFeeRate0xaf55febd basketFeeAllocation0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc4e833ce getHookPermissions0xc9fd4fee poolDecommissioned0x8f177c11 decommissionPool0x91dd7346 unlockCallback0x9ac0bef1 setGeneralFeeAllocation0x9f063efc afterAddLiquidity0x6fe7e6eb afterInitialize0x75bd69dc registerPool0x7728c6e3 settleProtocolPol0x78b11122 poolFeeRate0x81327715 clearPoolFeeRate0x4a717602 pendingStakerRewards0x53d87bcb poolRegistration0x575e24b4 beforeSwap0x6c2bbe7e afterRemoveLiquidity0x21d0ee70 beforeRemoveLiquidity0x259982e5 beforeAddLiquidity0x3d79d7e9 setPoolFeeRate0x3fc8cef3 weth0x07d33455 defaultFeeRate0x0850fc56 setBasketFeeAllocation0x1b8cfc68 pendingFeeDistribution0x1d685d1b generalFeeAllocation