Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,172,264
0xB6Ac…2aCc
The eight checks
7 pools use this hook, the first one 30 d ago.
- 01caution
Permissions that touch your moneyThe address enables before remove liquidity, before swap returns delta, 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.
- 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 0x31D8324480B5692b4a8E43BE4ff0C524A2b6F167. Owner-style functions: claimProtocolFees, setTrustedRouter, 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 record7 pools over 29 days.
Measured at block 93,172,264. 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 & 0x3fff0x2acc · 10101011001100
- 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 / OLEY
fee 0%- Swap ETH → OLEYno liquidity at the current price
- Swap OLEY → ETHno liquidity at the current price
- Add, then remove liquiditydeposit refused: NotAuthorized
pool 0x9c95219cfe3de52c28075da260b1d97ec34a8fa9a4f776a896add1d6ffcb1d9b
Read from the bytecode
- Code size
- 6,744 bytes
- Owner
- 0x31D8324480B5692b4a8E43BE4ff0C524A2b6F167
- 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.
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x32574bbf unknown
- 0x49d0c431 previewBuyFees
- 0x575e24b4 beforeSwap
- 0x687e2c17
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 remove liquidity. Can refuse a withdrawal. LPs may not get out.
- 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.
trustedRouter
0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x757a585c _rejectRelease0x77c654a3 claimProtocolFees0x79ba5097 acceptOwnership0x7b103999 registry0x85b0609a unknown0x8da5cb5b owner0x91dd7346 unlockCallback0x921dbe1c unknown0x9728538f FLAGS0x9f063efc afterAddLiquidity0xb47b2fb1 afterSwap0xb5217bb4 pools0xb6a8b0fa beforeDonate0xbf333f2c FEE_BPS0xc45a0155 unknown0xc64f5351 setTrustedRouter0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xdcf844a7 protocolFees0xe1b4af69 afterDonate0xe2fdcc17 escrow0xe30c3978 pendingOwner0xf2fde38b transferOwnership