Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,270,088
0xD028…28CC
The eight checks
4 pools use this hook, the first one 74 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.
- 02caution
What it takes from a swapIt takes 2% 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.
- 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 0x4310742a14D06419BCCe8892Be5E59106753bABA. Owner-style functions: transferOwnership, UPGRADE_INTERFACE_VERSION, setLaunchpad, upgradeToAndCall.
- 06fail
The code cannot changeIt is a proxy. The code that runs lives at 0x1f7adE4748a11cd930d6Af2C879F596a71EEd961.
- 07pass
Only the PoolManager can call itEach callback refused a call that did not come from the PoolManager.
- 08pass
Track record4 pools over 74 days.
Measured at block 93,270,088. 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 & 0x3fff0x28cc · 10100011001100
- 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 / TEST404
fee dynamic, now 0%- Swap ETH → TEST404hook takes 1.85%
- Swap TEST404 → ETHhook takes 1.85%
- Add, then remove liquiditydeposit refused: LiquidityLocked
pool 0x91c42af91983104e2c681f8a47686af7e391056b5a0c4b0951de0ea0863531ac
ETH / RBN404
fee dynamic, now 0%- Swap ETH → RBN404hook takes 2.00%
- Swap RBN404 → ETHhook takes 2%
- Add, then remove liquiditydeposit refused: LiquidityLocked
pool 0xfd728a1f424d381e28671d7b47216bb478e53dfe47bdbebcc88733b0ea330067
Read from the bytecode
- Code size
- 10,387 bytes
- Owner
- 0x4310742a14D06419BCCe8892Be5E59106753bABA
- Proxy
- yes, code at 0x1f7adE4748a11cd930d6Af2C879F596a71EEd961
- DELEGATECALL
- present
- SELFDESTRUCT
- absent
- Outside calls
- 1
- 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.
- 0xe1a45218 BPS_DENOMINATOR
- 0xe1b4af69 afterDonate
- 0xe30c3978 pendingOwner
- 0xf2fde38b transferOwnership
- 0xd246637b MAX_DECAY_SECONDS
- 0xd55be8c6 MAX_FEE_BPS
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.
- Before add liquidity. Can refuse a deposit, or only let some addresses provide liquidity.
- 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 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.
0xdc4c90d3
poolManager
0xdc98354e beforeInitialize0xb6a8b0fa beforeDonate0xc4d66de8 initialize0xc4e833ce getHookPermissions0xc8040e64 MAX_START_FEE_BPS0x9f063efc afterAddLiquidity0xac4e4054 REQUIRED_HOOK_FLAGS0xad3cb1cc UPGRADE_INTERFACE_VERSION0xb47b2fb1 afterSwap0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x79ba5097 acceptOwnership0x8da5cb5b owner0x52d1902d proxiableUUID0x575e24b4 beforeSwap0x5a60c0c8 register0x6c2bbe7e afterRemoveLiquidity0x21d0ee70 beforeRemoveLiquidity0x259982e5 beforeAddLiquidity0x36f4c0eb setLaunchpad0x4f1ef286 upgradeToAndCall0x02669b52 launchpad0x0885f732 poolConfig0x1d8ef3ef currentFeeBps