Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,144,397
0xB27C…85C7
The eight checks
6 pools use this hook, the first one 48 d ago.
- 01caution
Permissions that touch your moneyThe address enables after swap returns delta, after add returns delta, after remove returns delta. The hook is allowed to take; the next two checks measure whether it does.
- 02n/a
What it takes from a swapNo pool with liquidity to swap through yet.
- 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 switchOwned by 0xe09b168769DF480B402f1C05064875a4ebe51DFA. Owner-style functions: setWhitelistOnly, transferOwnership, setFeeRecipient, withdraw, setTrustedRouter, setGasThreshold.
- 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 48 days.
Measured at block 93,144,397. 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 & 0x3fff0x05c7 · 00010111000111
- 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 / USDG
fee dynamic, now 0%- Swap ETH → USDGno liquidity at the current price
- Swap USDG → ETHno liquidity at the current price
- Add, then remove liquiditycame back whole
pool 0x7074ca3c23d7f96d000615256f85d0e7be1d3918352641e964442c8ad7b7b41f
Read from the bytecode
- Code size
- 21,492 bytes
- Owner
- 0xe09b168769DF480B402f1C05064875a4ebe51DFA
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 5
- 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.
- 0xea05a8c6 setWhitelistOnly
- 0xef0560d7 unknown
- 0xf2fde38b transferOwnership
- 0xe8578107 unknown
- 0xe8d89ece getPoolFeeConfig
- 0xe1a45218 BPS_DENOMINATOR
- 0xe1b4af69
bit 4
After donate
bit 3Before swap returns deltabit 2After swap returns deltabit 1After add returns deltabit 0After remove returns delta- After add liquidity. Runs after each deposit.
- After remove liquidity. Runs after each withdrawal.
- Before swap. Runs before every swap. On a dynamic-fee pool it can set the fee each time.
- After swap. Runs after every swap.
- After swap returns delta. Can take part of what you get out of every swap.
- After add returns delta. Can charge LPs on the way in.
- After remove returns delta. Can take part of what LPs withdraw.
afterDonate
0xe30c3978 pendingOwner0xe74b981b setFeeRecipient0xd9caed12 withdraw0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xcc60c132 feeOverride0xcf2b0cac unknown0xc5117d93 unknown0xc64f5351 setTrustedRouter0xc899a6ac splitEnabled0xcb3b3ab3 setGasThreshold0xb7547be1 unknown0xbf862391 botFee0xc4e833ce getHookPermissions0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xa3f45c64 unknown0xa8f4d212 unknown0xb40d4551 unknown0xb41dc88b unknown0x9d951b3b tierThreeFee0x9f063efc afterAddLiquidity0x9f6fd915 unknown0x94168af8 swapCount0x9a50c628 tierOneFee0x810da780 exemptAddress0x81889f11 lpFees0x88457c34 poolFeeOverride0x8da5cb5b owner0x715018a6 renounceOwnership0x72359bd3 unknown0x79ba5097 acceptOwnership0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x5d2988eb unknown0x5fbbc0d2 getFeeConfig0x687e2c17 trustedRouter0x698c3891 setExemptAddress0x5a6c72d0 defaultFee0x5aeb4d77 minGasLimit0x5c975abb paused0x575e24b4 beforeSwap0x58ad48fd unknown0x40e05ce9 setSplitBps0x45fba837 unknown0x46904840 feeRecipient0x4b4687b5 whitelistOnly0x3bc9d18b setSplitEnabled0x3bccaca8 unknown0x40542878 floorFee0x38759da4 gasThreshold0x3ae9a260 quoteFee0x2b8f98ab unknown0x2d398609 unknown0x2fb08e7c unknown0x30df4a4b unknown0x21d0ee70 beforeRemoveLiquidity0x259982e5 beforeAddLiquidity0x2b6ad0e8 setFeeOverride0x162080cf unknown0x16c38b3c setPaused0x048d372c splitBps0x08ac6289 tierTwoFee0x14724809 unknown0x14e048ba FEE_CAP