Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,949,093
0x4e44…B8CC
The eight checks
35 pools use this hook, the first one 98 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.
- 02pass
What it takes from a swapA swap through it pays the pool fee and nothing else.
- 03pass
LPs can get outLiquidity added and removed in the same block came back whole.
- 04pass
The fee is the feeA fixed fee of 1%, written in the pool key.
- 05caution
No one holds the switchNo owner() but it has setFactory, emergencyWithdraw, setController, setPlatformFeeCollector.
- 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 record35 pools over 97 days.
Measured at block 92,949,093. 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 & 0x3fff0x38cc · 11100011001100
- 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.
WETH / MEMECOINS
fee 1%- Swap WETH → MEMECOINSnothing taken
- Swap MEMECOINS → WETHnothing taken
- Add, then remove liquiditycame back whole
pool 0x07c4ac40d5de1b68445edf9b65497cd33e13ff4ae8c1375e0aed18c569d6bdb2
WETH / hank
fee 1%- Swap WETH → hanknothing taken
- Swap hank → WETHnothing taken
- Add, then remove liquiditycame back whole
pool 0x06eb97849ab9e8c1bbb99c294c5ef32f7f3b299226659096bb979c31d4e03b17
Read from the bytecode
- Code size
- 6,410 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 3
- 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
- 0x163db71b totalDistributions
- 0x1d8ef3ef currentFeeBps
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x3fc8cef3 weth
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.
- After initialize. Runs once, right after 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.
0x479dfd7b
CREATOR_SHARE_BPS
0x4d6a631b MIN_DECAY_SECONDS0x4d7c90bc MAX_START_BPS0x575e24b4 beforeSwap0x5bb47808 setFactory0x5c12f040 emergencyWithdraw0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x785ffb37 THRESHOLD0x853a65f9 platformFeeCollector0x92eefe9b setController0x992d1976 MIN_END_BPS0x9c6b88a8 getPoolId0x9f063efc afterAddLiquidity0xa6aa80a7 configureHook0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xb996be53 isConfigured0xc45a0155 unknown0xc4e833ce getHookPermissions0xd246637b MAX_DECAY_SECONDS0xd3631fa5 totalPlatformFees0xd73792a9 FEE_DENOMINATOR0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xdfc90cf2 setPlatformFeeCollector0xe1b4af69 afterDonate0xe906e958 MIN_GAS_FOR_DISTRIBUTION0xf77c4791 controller0xfac2e984 executeDistribution0xfe2b214c totalCreatorFees