Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,172,226
0xaAc6…28CC
The eight checks
5 pools use this hook, the first one 91 d ago.
- 01caution
Permissions that touch your moneyThe address enables 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 2.00% 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.
- 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 switchNo owner() but it has settleClaim, claimBalance.
- 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 record5 pools over 91 days.
Measured at block 93,172,226. 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 & 0x3fff0x28cc · 10100011001100
- 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 / QLFUND
fee dynamic, now 0%- Swap ETH → QLFUNDhook takes 2.00%
- Swap QLFUND → ETHhook takes 2.00%
- Add, then remove liquiditydeposit refused: InitialLiquidityAlreadyAdded
pool 0x7c953b5463c65ec1819a8ae381f83a88433fb719eab181c0f039b424aff2a430
ETH / QLFUND
fee dynamic, now 0%- Swap ETH → QLFUNDhook takes 2.00%
- Swap QLFUND → ETHhook takes 2.00%
- Add, then remove liquiditydeposit refused: InitialLiquidityAlreadyAdded
pool 0xa0f81aaab90b94a353129028576122acfe0198b5f246bb5cc2c4bea3bb510bce
Read from the bytecode
- Code size
- 23,604 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 5
- 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.
- 0xdc98354e beforeInitialize
- 0xe1b4af69 afterDonate
- 0xe74ec265 OBSERVATION_CARDINALITY
- 0xe9702d27 lastSwapBlock
- 0xfa5c0ba0 registerPool
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.
- 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.
0xd0ad47eb
settleClaim
0xdc2b084d totalLiabilityByCurrency0xdc4c90d3 poolManager0xdc6c0a45 rewardsInToken0xb633e4cd claimBalance0xb6a8b0fa beforeDonate0xc4e833ce getHookPermissions0xc50f4022 liabilities0xcb004645 bucketLiability0x9c0cadb0 pendingSwap0x9f063efc afterAddLiquidity0xb197ba73 policyHash0xb47b2fb1 afterSwap0x6fe7e6eb afterInitialize0x72543905 MIN_TOTAL_FEE_PIPS0x90a49fcb lastSwapTick0x91dd7346 unlockCallback0x969fb981 registeredToken0x4b38474d feeSink0x575e24b4 beforeSwap0x6c2bbe7e afterRemoveLiquidity0x6f7c783f executionObservation0x21d0ee70 beforeRemoveLiquidity0x259982e5 beforeAddLiquidity0x2827bdb2 observations0x46ca626b TICK_SPACING0x0885f732 poolConfig0x16eebd1e launcher0x1d3c85ff OBSERVATION_SPACING