Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,145,530
0x4B7D…e8cC
The eight checks
7 pools use this hook, the first one 27 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.
- 02pass
What it takes from a swapIt takes 1.00% 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 0x7b6DbC8CB81C2d5a80B44025Fb9Ed9320301C468. Owner-style functions: setBuybackEnabled, setBuybackBurnBps, setFeeSweepOperator, setFactory, rescueBuyback, setBuybackVault.
- 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 record7 pools over 27 days.
Measured at block 93,145,530. 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.
SAYMOON / MSTR
fee 0%- Swap SAYMOON → MSTRno liquidity below the price
- Swap MSTR → SAYMOONhook takes 1.00%
- Add, then remove liquiditydeposit refused: LiquidityLocked
pool 0x1af30f593197024e90b1998f750924ee994934f31e50e59fd02d70db23d05882
ANIME / MSTR
fee 0%- Swap ANIME → MSTRno liquidity below the price
- Swap MSTR → ANIMEhook takes 1.00%
- Add, then remove liquiditydeposit refused: LiquidityLocked
pool 0x536016074c1b4a5685b05673d6a4f4c8599ef000cf08d8f6aca510de52a1a4bd
Read from the bytecode
- Code size
- 15,815 bytes
- Owner
- 0x7b6DbC8CB81C2d5a80B44025Fb9Ed9320301C468
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 16
- 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.
- 0x083cde48 feesPaused
- 0x08456908 executeBuyback
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x2ce8b029 setBuybackEnabled
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.
0x40c3b484
registerPool
0x48332680 setBuybackBurnBps0x49127e2a buybackBurnBps0x50e25ac2 snipeTaxStartBps0x54faf9c3 setFeeSweepOperator0x575e24b4 beforeSwap0x58256778 openMintWindow0x5bb47808 setFactory0x64df049e protocolFeeRecipient0x6783774b snipeTaxSeconds0x6c2bbe7e afterRemoveLiquidity0x6f589901 rescueBuyback0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x7862505c setBuybackVault0x79ba5097 acceptOwnership0x834e7e19 snipeTerms0x837e51f4 setSnipeTax0x83dfa055 setPoolFeesPaused0x89a69bd8 currentFeePolicy0x8a36a6bb feeSweepOperator0x8da5cb5b owner0x9040f866 protocolFeeShareBps0x90addc1e maxInternalPriceImpactBps0x91dd7346 unlockCallback0x9f063efc afterAddLiquidity0xa22f9667 closeMintWindow0xa26c3c45 snipeTaxExempt0xad091230 launches0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xb89eddab setMaxInternalPriceImpactBps0xbfe7af83 setHookFeeBps0xc3fcd8c5 pendingBuyback0xc45a0155 unknown0xc4b7de97 feeEscrow0xc4e833ce getHookPermissions0xd7a41f92 currentSnipeTaxBps0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe30c3978 pendingOwner0xe521cb92 setProtocolFeeRecipient0xea26abcf hookFeeBps0xed8ef7a3 setCreatorFeeRecipient0xf1f5c993 buybackVault0xf2fde38b transferOwnership0xfb937c3b launchedAt0xfc75e481 setProtocolFeeShareBps0xff94e4f3 creatorOf