Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,206,460
0xa1eC…20CC
The eight checks
5 pools use this hook, the first one 37 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.
- 02fail
What it takes from a swapOne direction works and the other is refused (PART). You may be able to buy and not sell.
- 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 switchOwned by 0x3Cc4F0CA3476996815cb5D6F86B97e83aB74578d. Owner-style functions: setTreasury, claimOtc, setPerpFeeAdapterOnce, setTokenWhitelist, setSwapperContext, setCanonicalRuntimeHash.
- 06caution
The code cannot changeThe bytecode contains DELEGATECALL.
- 07pass
Only the PoolManager can call itEach callback refused a call that did not come from the PoolManager.
- 08pass
Track record5 pools over 37 days.
Measured at block 93,206,460. 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 & 0x3fff0x20cc · 10000011001100
- 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 / FBTEST
fee 0.60%- Swap WETH → FBTESThook adds 0.01%
- Swap FBTEST → WETHhook takes 0.10%
- Add, then remove liquiditycame back whole
pool 0x107ee8312f34084d0dd84f3b8220cc6506e8cd76dbafb060f52b74b57362e37c
RSTOCK / NVDA
fee 1%- Swap RSTOCK → NVDArefused: PART
- Swap NVDA → RSTOCKhook adds 0.01%
- Add, then remove liquiditycame back whole
pool 0x58eceb2746e50563895007f4e88e333000d05d9c053f0557ee411e02278daea6
Read from the bytecode
- Code size
- 23,928 bytes
- Owner
- 0x3Cc4F0CA3476996815cb5D6F86B97e83aB74578d
- Proxy
- no
- DELEGATECALL
- present
- SELFDESTRUCT
- absent
- Outside calls
- 20
- 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.
- 0xf0f44260 setTreasury
- 0xf301542b perpRouteModule
- 0xf9b30e4a mainPoolOf
- 0xffc2e22a protocolTokenOfPool
- 0xe838d0a9 taxModule
- 0xe92a0fba claimOtc
- 0xeb6d3a11 wrappedNative
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 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.