Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,268,279
0x1126…eaCc
The eight checks
4 pools use this hook, the first one 69 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 4% of each swap 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 0x5550C415579d3fD614338890a49F62602CBF9562. Owner-style functions: transferCreator, setOwner, claim, sweep, claimable, setTreasury.
- 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 68 days.
Measured at block 93,268,279. 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.
USDG / RUNALL
fee 0%- Swap USDG → RUNALLhook takes 4.00%
- Swap RUNALL → USDGhook takes 4%
- Add, then remove liquiditydeposit refused: error 0xbad638e0
pool 0x44ca3e79df3fe791b79a5bfada0e94448442f4c6b9cfa431dacfedfcf4fd5c06
BOBBY / NVDA
fee 0%- Swap BOBBY → NVDAno liquidity below the price
- Swap NVDA → BOBBYhook takes 1.00%
- Add, then remove liquiditydeposit refused: error 0xbad638e0
pool 0xc5188004cba0d93ff3f7c2851530d015bb0f4b2f6057be29285f0cbbc47afb3a
Read from the bytecode
- Code size
- 13,675 bytes
- Owner
- 0x5550C415579d3fD614338890a49F62602CBF9562
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 8
- 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.
- 0x02ce01fb transferCreator
- 0x08b66372 HOOK_FLAGS
- 0x13af4035 setOwner
- 0x1e83409a claim
- 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.