Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,395,881
0xC42B…80cC
The eight checks
3 pools use this hook, the first one 66 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 swapIt takes 1% 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 0x503e81f3466eFc00f27a0FC482b18c09F3538366. Owner-style functions: setFeeBps, claimFees, setDistributor, setDestinations, withdrawOwed, claimV3Factory.
- 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 record3 pools over 66 days.
Measured at block 93,395,881. 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 & 0x3fff0x00cc · 00000011001100
- 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.
LSTK / NVDA
fee 0%- Swap LSTK → NVDAhook takes 1%
- Swap NVDA → LSTKhook takes 1.00%
- Add, then remove liquiditycame back whole
pool 0xbd495083446731aca1185629921b7a5104e03150f9755730cfdea00a5263c353
DDOG / USDG
fee 0%- Swap DDOG → USDGhook takes 1.00%
- Swap USDG → DDOGhook takes 1.00%
- Add, then remove liquiditycame back whole
pool 0x9bb7da6ea8d19168ed850b2a3ce04dbf92c18e54976ecbe7bbb7e67deda85b8e
Read from the bytecode
- Code size
- 14,490 bytes
- Owner
- 0x503e81f3466eFc00f27a0FC482b18c09F3538366
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 16
- 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.
- 0x023b1fc9 setFeeBps
- 0x02669b52 launchpad
- 0x0dc91306 v3Router
- 0x12ecdff8 unknown
- 0x15a0ea6a claimFees
- 0x2130b1e6 mechanismBps
- 0x21d0ee70 beforeRemoveLiquidity
bit 4
After donate
bit 3Before swap returns deltabit 2After swap returns deltabit 1After add returns deltabit 0After remove returns delta- 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.