Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,269,077
0x096d…85c7
The eight checks
5 pools use this hook, the first one 47 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 0xc6cf9Db04887e11Ce04FBBE8A49498140B9CeE82. Owner-style functions: transferOwnership, setWhitelistOnly, withdraw, setTrustedRouter, setExemptAddress, paused.
- 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 46 days.
Measured at block 93,269,077. 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.
GME / USDG
fee dynamic, now 0%- Swap GME → USDGno liquidity at the current price
- Swap USDG → GMEno liquidity at the current price
- Add, then remove liquiditycame back whole
pool 0xaf9cd2b9c15feb61f9645b9972759691c28ca6125e504ea5eed12d9f02f3e3eb
Read from the bytecode
- Code size
- 18,621 bytes
- Owner
- 0xc6cf9Db04887e11Ce04FBBE8A49498140B9CeE82
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 3
- 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.
- 0xf0f48a67 unknown
- 0xf1e6cd24 unknown
- 0xf2fde38b transferOwnership
- 0xf62ab668 unknown
- 0xe8578107 unknown
- 0xe8d89ece getPoolFeeConfig
- 0xea05a8c6 setWhitelistOnly
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.
0xef0560d7
unknown
0xdc98354e beforeInitialize0xe1a45218 BPS_DENOMINATOR0xe1b4af69 afterDonate0xe30c3978 pendingOwner0xcc60c132 feeOverride0xcf2b0cac unknown0xd9caed12 withdraw0xdc4c90d3 poolManager0xbf862391 botFee0xc4e833ce getHookPermissions0xc5117d93 unknown0xc64f5351 setTrustedRouter0xb47b2fb1 afterSwap0xb6852851 unknown0xb6a8b0fa beforeDonate0xb7547be1 unknown0xa3f45c64 unknown0xa8f4d212 unknown0xb28a0da0 unknown0xb40d4551 unknown0x94168af8 swapCount0x9a50c628 tierOneFee0x9d951b3b tierThreeFee0x9f063efc afterAddLiquidity0x79ba5097 acceptOwnership0x810da780 exemptAddress0x88457c34 poolFeeOverride0x8da5cb5b owner0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x72359bd3 unknown0x5d2988eb unknown0x5fbbc0d2 getFeeConfig0x687e2c17 trustedRouter0x698c3891 setExemptAddress0x575e24b4 beforeSwap0x58ad48fd unknown0x5a6c72d0 defaultFee0x5c975abb paused0x40542878 floorFee0x45fba837 unknown0x4b4687b5 whitelistOnly0x535bcded unknown0x259982e5 beforeAddLiquidity0x2b6ad0e8 setFeeOverride0x2d398609 unknown0x3bccaca8 unknown0x14e048ba FEE_CAP0x162080cf unknown0x16c38b3c setPaused0x21d0ee70 beforeRemoveLiquidity0x08ac6289 tierTwoFee0x0cf29b75 unknown0x14724809 unknown