Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,393,175
0x7778…00C4
The eight checks
3 pools use this hook, the first one 51 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.
- 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 0x234cc72F62223aa85Db907fE954dC0218DBf3e3D. Owner-style functions: transferOwnership, rescueEth, withdraw, setPayout, setThresholds, 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 record3 pools over 50 days.
Measured at block 93,393,175. 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 & 0x3fff0x00c4 · 00000011000100
- 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 0x4ee12f8c49799e5c0f9003d306b229acfe6a66f55cfeac6c9f95372ea427cb35
Read from the bytecode
- Code size
- 9,575 bytes
- Owner
- 0x234cc72F62223aa85Db907fE954dC0218DBf3e3D
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 4
- 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.
- 0xe1b4af69 afterDonate
- 0xe30c3978 pendingOwner
- 0xec543841 unknown
- 0xf2fde38b transferOwnership
- 0xdc4c90d3 poolManager
- 0xdc98354e beforeInitialize
bit 4
After donate
bit 3Before swap returns deltabit 2After swap returns deltabit 1After add returns deltabit 0After remove returns delta- 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.
0xe1a45218
BPS_DENOMINATOR
0xd73792a9 FEE_DENOMINATOR0xd7cc3d35 rescueEth0xd9caed12 withdraw0xb5428f6b unknown0xb6a8b0fa beforeDonate0xc4e833ce getHookPermissions0xa819baf5 unknown0xab1413d7 unknown0xb47b2fb1 afterSwap0x94168af8 swapCount0x9f063efc afterAddLiquidity0xa3ff39b2 setPayout0x8b67ce4e setThresholds0x8da5cb5b owner0x922dc4d4 unknown0x749366f9 unknown0x79ba5097 acceptOwnership0x7dac9984 MAX_PROTOCOL_FEE_PIPS0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x72edf1eb unknown0x6854a7e5 maxChargeAmount0x6a552081 unknown0x6bf752ae unknown0x5c975abb paused0x5fbbc0d2 getFeeConfig0x63bd1d4a payout0x535eac4d unknown0x575e24b4 beforeSwap0x5ba5a9af RANDOM_MODULUS0x2c03ca5a unknown0x2e9e6384 unknown0x4da207bc feeDefault0x21d0ee70 beforeRemoveLiquidity0x259982e5 beforeAddLiquidity0x274d7ee7 unknown0x104bab85 unknown0x144bcc0c unknown0x16c38b3c setPaused0x01467e15 setMaxChargeAmount0x01681a62 sweep0x07311283 accruedFees