Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,456,150
0xf4eB…28Cc
The eight checks
3 pools use this hook, the first one 12 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 4% 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%, written in the pool key.
- 05caution
No one holds the switchOwned by 0xC2a54b14288573C31b15606a0Ad1eA6eedED714e. Owner-style functions: setFactory, claimCreatorFees, transferOwnership.
- 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 11 days.
Measured at block 93,456,150. 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 / MOONBASE
fee 0%- Swap ETH → MOONBASEhook takes 4.00%
- Swap MOONBASE → ETHhook takes 4%
- Add, then remove liquiditydeposit refused: NotFactory
pool 0xc6cb931ec6e2c8befc36730cf2a47ed13b4ce578f8215a135a490f811009b7cc
LAUNCHPAD / USDG
fee 0%- Swap LAUNCHPAD → USDGno liquidity below the price
- Swap USDG → LAUNCHPADhook takes 4.00%
- Add, then remove liquiditydeposit refused: NotFactory
pool 0xd96d358d0d567d781731811faf61ee29c78fa486d9068531b770d8e164335da2
Read from the bytecode
- Code size
- 11,885 bytes
- Owner
- 0xC2a54b14288573C31b15606a0Ad1eA6eedED714e
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 6
- 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.
- 0x071bbd03 rewardsOwed
- 0x1987cdce nextMoonbaseWallet
- 0x1a0c35a8 WALLET_DELAY
- 0x1fd71a18 creatorOwed
- 0x21d0ee70 beforeRemoveLiquidity
- 0x249d39e9 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.
0x259982e5
beforeAddLiquidity
0x575e24b4 beforeSwap0x5b35f9c9 rewardsWallet0x5bb47808 setFactory0x5dbe3e39 totalHolderFees0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x79ba5097 acceptOwnership0x79c76e1a flush0x8da5cb5b owner0x8f2216ca totalCreatorFees0x91dd7346 unlockCallback0x9f063efc afterAddLiquidity0xa734d026 nextRewardsWallet0xa7465bdb pairOf0xad091230 launches0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xb7fcd8bb proposeWallets0xb947efcb claimCreatorFees0xc3095620 MOONBASE_BPS0xc45a0155 unknown0xc4e833ce getHookPermissions0xc5e153f7 feeBps0xd4552f3e register0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe16fd45a moonbaseOwed0xe1b4af69 afterDonate0xe1bf12e5 moonbaseWallet0xe2b25bbf totalMoonbaseFees0xe30c3978 pendingOwner0xf2fde38b transferOwnership0xf5821075 applyWallets0xfa438275 walletsChangeAt