Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,327,395
0xBA9b…6880
The eight checks
4 pools use this hook, the first one 47 d ago.
- 01pass
Permissions that touch your moneyNone of the permissions that let a hook take from swaps or from LPs are switched on.
- 02n/a
What it takes from a swapNo pool with liquidity to swap through yet.
- 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 0xBd7d70551fa449a279b37a35b91d9bfB00f0e170. Owner-style functions: 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 record4 pools over 46 days.
Measured at block 93,327,395. 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 & 0x3fff0x2880 · 10100010000000
- 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.
MEME / USDG
fee dynamic, now 0%- Swap MEME → USDGno liquidity at the current price
- Swap USDG → MEMEno liquidity at the current price
- Add, then remove liquiditydeposit refused: UnauthorizedLiquidityManager
pool 0x94c446641903ff3216310385e793a1e148d5708e96cf4a503d55d5c59bf04c95
Read from the bytecode
- Code size
- 5,384 bytes
- Owner
- 0xBd7d70551fa449a279b37a35b91d9bfB00f0e170
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 0
- 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.
- 0x0d3c09f7 poolConfigVersion
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x2edfb8ae unknown
- 0x575e24b4 beforeSwap
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.
0x5bf70edf
isPoolConfigured
0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x791b98bc positionManager0x79d63fe2 unknown0x809b18d5 WEIGHT_DENOMINATOR0x8da5cb5b owner0x9789ae80 isPoolRegistered0x9b9381f5 unknown0x9f063efc afterAddLiquidity0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc4e833ce getHookPermissions0xd060462e poolSwapCount0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe8d89ece getPoolFeeConfig0xeba164de mxSwapAmt0xf2fde38b transferOwnership