Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,174,910
0x4a00…6544
The eight checks
5 pools use this hook, the first one 94 d ago.
- 01caution
Permissions that touch your moneyThe address enables after swap returns delta. The hook is allowed to take; the next two checks measure whether it does.
- 02caution
What it takes from a swapIt takes 10% of each swap on top of the pool fee.
- 03n/a
LPs can get outClosed to outside LPs: only the hook's own liquidity is in the pool.
- 04pass
The fee is the feeA fixed fee of 0.30%, written in the pool key.
- 05caution
No one holds the switchOwned by 0x4F0d0d4d03774b00A03052856A011d9648203159. Owner-style functions: setFeeExemptSwapper, rescueETH, setStrategy, setPoolParams, setPositionManager, setStrategyFeeParams.
- 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 record5 pools over 94 days.
Measured at block 93,174,910. 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 & 0x3fff0x2544 · 10010101000100
- 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.
USDG / NVDASTR
fee 0.30%- Swap USDG → NVDASTRnothing taken
- Swap NVDASTR → USDGnothing taken
- Add, then remove liquiditydeposit refused: UnauthorizedLiquidity
pool 0x8210bbe1afea6a2803fc2f4e1caa774957afe406bd5f82c18a726b54169668c8
USDG / test1341412
fee 0.30%- Swap USDG → test1341412hook takes 10%
- Swap test1341412 → USDGhook takes 10.00%
- Add, then remove liquiditydeposit refused: UnauthorizedLiquidity
pool 0x51819855c804188ad8649ee8a7b9ec621f96c368d0127ed04d6beec246257cda
Read from the bytecode
- Code size
- 11,193 bytes
- Owner
- 0x4F0d0d4d03774b00A03052856A011d9648203159
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 13
- 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.
- 0x07395638 setFeeExemptSwapper
- 0x089fe6aa poolFee
- 0x099a04e5 rescueETH
- 0x11a1ad57 poolCountByStrategy
- 0x21d0ee70 beforeRemoveLiquidity
- 0x23fa8a05 calculateBuyFeeBps
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 add liquidity. Runs after each deposit.
- After remove liquidity. Runs after each withdrawal.
- After swap. Runs after every swap.
- After swap returns delta. Can take part of what you get out of every swap.
0x259982e5
beforeAddLiquidity
0x304368e2 setStrategy0x35969b58 DEFAULT_STARTING_FEE_BPS0x3f0b7b6b DEFAULT_FEE_DECAY_BPS_PER_MINUTE0x456f948b deactivateStrategy0x4d26d3c3 setPoolParams0x575e24b4 beforeSwap0x5760f2e3 setPositionManager0x5e7fb503 strategyFees0x5f6e8a8c calculateSellFeeBps0x61846a75 stratTokenOf0x646ff158 feeExemptSwappers0x6c2bbe7e afterRemoveLiquidity0x6dcf0ed3 strategyOf0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x7270830f setStrategyFeeParams0x7373bc87 DEFAULT_OPS_SHARE_BPS0x73c87bbe calculateSellFeeBps0x791b98bc positionManager0x7dc63812 TOTAL_BIPS0x8da5cb5b owner0x950bcd3d isPoolActive0x9b9a39c6 strategyIdByStratToken0x9f063efc afterAddLiquidity0xb32069d8 setLaunchTimestamp0xb47b2fb1 afterSwap0xb5217bb4 pools0xb6a8b0fa beforeDonate0xb9c18157 setStrategyFeeCollector0xba1ef93f setStrategyOpsWallet0xc4e833ce getHookPermissions0xcea9d26f rescueTokens0xd0c93a7c tickSpacing0xd574ea3d strategies0xdc44a187 calculateBuyFeeBps0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xee7d4346 DEFAULT_RESTING_FEE_BPS0xf2fde38b transferOwnership0xf525cb68 poolCount0xf5b91b7b usdg