Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,239,368
0x1722…a8CC
The eight checks
4 pools use this hook, the first one 102 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 3% 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 0x4e59b44847b379578588920cA78FbF26c0B4956C. Owner-style functions: setTreasury, transferOwnership, claimFees, setCreatorFee, setDefaultConfig, setFactoryFee.
- 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 102 days.
Measured at block 93,239,368. 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 / PAKISTAN
fee 0%- Swap ETH → PAKISTAN hook takes 3.00%
- Swap PAKISTAN → ETHhook takes 3%
- Add, then remove liquiditycame back whole
pool 0x98a833bd05a159a08e1333a9dadc875cc78c43b84506634d15fd1a54de725284
Read from the bytecode
- Code size
- 23,672 bytes
- Owner
- 0x4e59b44847b379578588920cA78FbF26c0B4956C
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 22
- 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.
- 0xe1b4af69 afterDonate
- 0xf0f44260 setTreasury
- 0xf2fde38b transferOwnership
- 0xdc4c90d3 poolManager
- 0xdc98354e beforeInitialize
- 0xbe378228 PROTOCOL_FEE_BPS
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.
0xc4e833ce
getHookPermissions
0xd294f093 claimFees0xd6474a0b curveReserves0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xb7a84816 quoteBuyExactIn0xa844a134 MAX_CREATOR_FEE_BPS0xaaeb8ac5 setCreatorFee0x9aa75fdb launch0x9d72265e REFERRAL_FEE_BPS0x9e09ed5f defaultConfig0x9f063efc afterAddLiquidity0x8da5cb5b owner0x902d55a5 TOTAL_SUPPLY0x91dd7346 unlockCallback0x6fe7e6eb afterInitialize0x7d1d589c getLaunch0x575e24b4 beforeSwap0x61d027b3 treasury0x6286116a factoryFee0x6c2bbe7e afterRemoveLiquidity0x259982e5 beforeAddLiquidity0x46ca626b TICK_SPACING0x491ed947 setDefaultConfig0x54b636af antiSnipeBought0x03545f6a setFactoryFee0x13083c34 feesOwed0x21d0ee70 beforeRemoveLiquidity0x249d39e9 BPS0xa9059cbb transfer0xd505accf permit0xdd62ed3e allowance0x70a08231 balanceOf0x7ecebe00 nonces0x95d89b41 symbol0x23b872dd transferFrom0x313ce567 decimals0x3644e515 DOMAIN_SEPARATOR0x06fdde03 name0x095ea7b3 approve0x18160ddd totalSupply