Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,145,991
0x2194…C8c4
The eight checks
7 pools use this hook, the first one 5 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.
- 08caution
Track record7 pools, first seen 4 days ago.
Measured at block 93,145,991. 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 / CCAT
fee 0%- Swap WETH → CCAThook takes 1.25%
- Swap CCAT → WETHhook takes 1.25%
- Add, then remove liquiditycame back whole
pool 0x35eba365a1df51c9f1a81d0883d3630860f376c2f22a5b5187cf6b9b7b65da1d
GME / BUY
fee 0%- Swap GME → BUYhook takes 1.25%
- Swap BUY → GMEhook takes 1.25%
- Add, then remove liquiditycame back whole
pool 0x525e5eae84d1b1484ccc587a467a0e440e1a87d2e5210303b926a299bcd56d28
Read from the bytecode
- Code size
- 18,298 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 13
- 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
- 0xe2c1d1d1 TWAP_WINDOW
- 0xfa461e33 uniswapV3SwapCallback
- 0xfbfa77cf vault
- 0xfc6fe14e maxCreatorBps
- 0xff27b300 vaultBps
- 0xd2128db5
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.
registerPoolWithQuote
0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xdcf6836b quoteIsCurrency00xde90e29b creatorBps0xad5c4648 WETH0xb13e0cf0 owedFees0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc45a0155 unknown0xc4e833ce getHookPermissions0x91dd7346 unlockCallback0x9f063efc afterAddLiquidity0xa6a0657c unknown0xa71eeac4 registerPoolWithCreatorBps0xad449a97 sweepAccrued0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x72aa4f07 registerPool0x766fcc67 vaultAccrued0x876a772b unknown0x8ada032e V2_ROUTER0x4bf3d25c openTrading0x4df8ccb1 platformOwner0x4e6189d0 unknown0x54b9c343 ownerBps0x575e24b4 beforeSwap0x249d39e9 BPS0x259982e5 beforeAddLiquidity0x32e1f7a8 unknown0x353c0970 MAX_TOTAL_BPS0x49c4a7b0 poolCreatorBps0x0885f732 poolConfig0x08bd1a85 V3_FACTORY0x0d783d4f sweepFees0x2161944f MIN_OUT_BPS0x21d0ee70 beforeRemoveLiquidity