Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,979,123
0xc6Bf…08C4
The eight checks
26 pools use this hook, the first one 12 d ago.
- 01caution
Permissions that touch your moneyThe address enables 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 1.25% 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 sweepAccrued, sweepFees.
- 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 record26 pools over 12 days.
Measured at block 92,979,123. 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 & 0x3fff0x08c4 · 00100011000100
- 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 / SIGMA
fee 0%- Swap WETH → SIGMAhook takes 1.25%
- Swap SIGMA → WETHhook takes 1.25%
- Add, then remove liquiditycame back whole
pool 0x29b9759c1252ab712e90d64f88cce234d3557307d97af1f4e73f39cb8f77dd47
WETH / Banksy
fee 0%- Swap WETH → Banksyhook takes 1.25%
- Swap Banksy → WETHhook takes 1.25%
- Add, then remove liquiditycame back whole
pool 0x062fb2de8dca45429b72dceb23845a141e25b0058c25acb1ea40ddc6e0268625
Read from the bytecode
- Code size
- 11,187 bytes
- Owner
- none found
- 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.
- 0xde90e29b creatorBps
- 0xe1b4af69 afterDonate
- 0xfbfa77cf vault
- 0xfc6fe14e maxCreatorBps
- 0xff27b300 vaultBps
- 0xd2128db5 registerPoolWithQuote
- 0xdc4c90d3
bit 4
After donate
bit 3Before swap returns deltabit 2After swap returns deltabit 1After add returns deltabit 0After remove returns delta- 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.
- After swap returns delta. Can take part of what you get out of every swap.
poolManager
0xdc98354e beforeInitialize0xdcf6836b quoteIsCurrency00xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc45a0155 unknown0xc4e833ce getHookPermissions0xa71eeac4 registerPoolWithCreatorBps0xad449a97 sweepAccrued0xad5c4648 WETH0xb13e0cf0 owedFees0x6fe7e6eb afterInitialize0x72aa4f07 registerPool0x766fcc67 vaultAccrued0x91dd7346 unlockCallback0x9f063efc afterAddLiquidity0x4df8ccb1 platformOwner0x54b9c343 ownerBps0x575e24b4 beforeSwap0x6c2bbe7e afterRemoveLiquidity0x259982e5 beforeAddLiquidity0x353c0970 MAX_TOTAL_BPS0x49c4a7b0 poolCreatorBps0x4bf3d25c openTrading0x0885f732 poolConfig0x0d783d4f sweepFees0x21d0ee70 beforeRemoveLiquidity0x249d39e9 BPS