Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,085,576
0xFfe2…A0CC
The eight checks
9 pools use this hook, the first one 19 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 1.20% 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 switchNo owner() but it has claim, claimCreator, claimable.
- 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 record9 pools over 19 days.
Measured at block 93,085,576. 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 & 0x3fff0x20cc · 10000011001100
- 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 / CZED
fee 0%- Swap ETH → CZEDhook takes 1.20%
- Swap CZED → ETHhook takes 1.20%
- Add, then remove liquiditycame back whole
pool 0x39bdda3f9081c22ee60ec1e12fef939b522ee5452ea3136f5c8c576157c40392
ETH / SI
fee 0%- Swap ETH → SIhook takes 1.00%
- Swap SI → ETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0x89e4f7e1ba2ba4c528e4549ffe6d08f0cc8b2370f13396c967f1ee432695395d
Read from the bytecode
- Code size
- 11,062 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 10
- 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.
- 0x07ef2190 poolConfigs
- 0x0ebab9ce MIN_CREATOR_BPS
- 0x21c0b342 claim
- 0x21d0ee70 beforeRemoveLiquidity
- 0x249d39e9 BPS
- 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 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.
0x33a0e8b7
claimCreator
0x353c0970 MAX_TOTAL_BPS0x481c6a75 manager0x4e627e62 referralRegistry0x538a3f0e initializeFactory0x575e24b4 beforeSwap0x60fcec47 MIN_REFERRAL_BPS0x61d027b3 treasury0x62545788 creatorClaimed0x678b2d62 MAX_CREATOR_RECIPIENTS0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x8c6c6900 executeBuyback0x8c8f6126 registerPool0x91dd7346 unlockCallback0x9f063efc afterAddLiquidity0xa574a2d9 creatorWeightBps0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc1e7af35 PROTOCOL_BPS0xc45a0155 unknown0xd4570c1c claimable0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xf5778b03 bootstrapAdmin0xf85ace85 buybackAccrued0xf887ea40 router0xfd7e8033 creatorAccrued