Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,239,524
0x5508…80c4
The eight checks
5 pools use this hook, the first one 54 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.
- 02n/a
What it takes from a swapNo pool with liquidity to swap through yet.
- 03pass
LPs can get outLiquidity added and removed in the same block came back whole.
- 04caution
The fee is the feeIts pools use a dynamic fee that the hook sets before every swap. It stands at 0% now and can change.
- 05caution
No one holds the switchOwned by 0x3C358D64A8ff3414f6F1f01D04afa19Dd18ab035. Owner-style functions: sweep, setPaused, paused, setGasThreshold, withdraw.
- 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 record5 pools over 54 days.
Measured at block 93,239,524. 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 & 0x3fff0x00c4 · 00000011000100
- 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.
ETH / USDG
fee dynamic, now 0%- Swap ETH → USDGno liquidity at the current price
- Swap USDG → ETHno liquidity at the current price
- Add, then remove liquiditycame back whole
pool 0x07a5cad3fb747e2300f4fe6ee4d81a93f4c885b87c335366cacba827f30644e7
Read from the bytecode
- Code size
- 6,206 bytes
- Owner
- 0x3C358D64A8ff3414f6F1f01D04afa19Dd18ab035
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 5
- 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.
- 0x01681a62 sweep
- 0x08ac6289 tierTwoFee
- 0x16c38b3c setPaused
- 0x1ebae29d unknown
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
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.
- After swap returns delta. Can take part of what you get out of every swap.
0x2d398609
unknown
0x38759da4 gasThreshold0x575e24b4 beforeSwap0x5a6c72d0 defaultFee0x5c975abb paused0x5fbbc0d2 getFeeConfig0x63bd1d4a payout0x68f0a1d9 GAS_BUFFER_BPS0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x809b18d5 WEIGHT_DENOMINATOR0x8da5cb5b owner0x94168af8 swapCount0x9a50c628 tierOneFee0x9d951b3b tierThreeFee0x9f063efc afterAddLiquidity0xa7acb562 unknown0xaae49d70 PIPS_DENOMINATOR0xb40d4551 unknown0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc4e833ce getHookPermissions0xc5117d93 unknown0xcb3b3ab3 setGasThreshold0xce6f4cf8 DEFAULT_GAS_THRESHOLD0xcf2b0cac unknown0xd9caed12 withdraw0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate