Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,145,465
0x46C4…2544
The eight checks
6 pools use this hook, the first one 67 d ago.
- 01caution
Permissions that touch your moneyThe address enables 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 0.30%, written in the pool key.
- 05caution
No one holds the switchOwned by 0xF5830af934cb05B81F935B932C01060fe6De29C1. Owner-style functions: setFeeExemptSwapper, rescueETH, setPoolParams, setPositionManager, setListingOpsWallet, setListingFeeCollector.
- 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 record6 pools over 66 days.
Measured at block 93,145,465. 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 & 0x3fff0x2544 · 10010101000100
- 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.
USDG / HOOKED
fee 0.30%- Swap USDG → HOOKEDno liquidity at the current price
- Swap HOOKED → USDGno liquidity at the current price
- Add, then remove liquiditydeposit refused: UnauthorizedLiquidity
pool 0x97a45826c82a11297a978dcf95f6210ad0a9f9610fdc4abd5b9d1609e3ad1ad7
Read from the bytecode
- Code size
- 11,978 bytes
- Owner
- 0xF5830af934cb05B81F935B932C01060fe6De29C1
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 15
- 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.
- 0x07395638 setFeeExemptSwapper
- 0x089fe6aa poolFee
- 0x099a04e5 rescueETH
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x3b8d915f deactivateListing
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.
- After add liquidity. Runs after each deposit.
- After remove liquidity. Runs after each withdrawal.
- After swap. Runs after every swap.
- After swap returns delta. Can take part of what you get out of every swap.