Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,297,085
0x711e…6ACc
The eight checks
4 pools use this hook, the first one 17 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.
- 02caution
What it takes from a swapIt takes 2% of each swap on top of the pool fee.
- 03pass
LPs can get outLiquidity added and removed in the same block came back whole.
- 04pass
The fee is the feeA fixed fee of 0%, written in the pool key.
- 05caution
No one holds the switchOwned by 0x49052F253056A0508a079dA2bc80E5a72B41d46E. Owner-style functions: setOwner, setArbActive, setFactory, setAirdropVault, setArbExecutor, setKhookDropVault.
- 06caution
The code cannot changeThe bytecode contains DELEGATECALL.
- 07pass
Only the PoolManager can call itEach callback refused a call that did not come from the PoolManager.
- 08pass
Track record4 pools over 16 days.
Measured at block 93,297,085. 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 / KHAT
fee 0%- Swap ETH → KHAThook takes 1.00%
- Swap KHAT → ETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0x248edc11524444466db1d9e5e9d3ee0a0c334cb11730b5b830a4637ed49af4db
ETH / KHOOKED
fee 0%- Swap ETH → KHOOKEDhook takes 2.00%
- Swap KHOOKED → ETHhook takes 2%
- Add, then remove liquiditycame back whole
pool 0xbaff23dca3cdc81d0d9b7a9a2c4d7fb79324df1a9e3db229d0d2a44b1f4b1c95
Read from the bytecode
- Code size
- 21,574 bytes
- Owner
- 0x49052F253056A0508a079dA2bc80E5a72B41d46E
- Proxy
- no
- DELEGATECALL
- present
- SELFDESTRUCT
- absent
- Outside calls
- 18
- 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.
- 0x08b66372 HOOK_FLAGS
- 0x0f13e135 arbActive
- 0x13af4035 setOwner
- 0x1faba457 pendingDeepenLps
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
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.