Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,893,003
0xe055…EaCc
The eight checks
87 pools use this hook, the first one 21 d ago.
- 01caution
Permissions that touch your moneyThe address enables before remove liquidity, before swap returns delta, 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 3.00% of each swap on top of the pool fee.
- 03n/a
LPs can get outClosed to outside LPs: only the hook's own liquidity is in the pool.
- 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 setLaunchBuyAdapter, BURN_SINK, updateCreatorRights.
- 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 record87 pools over 20 days.
Measured at block 92,893,003. 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 & 0x3fff0x2acc · 10101011001100
- 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 / o1 Hook
fee 0%- Swap ETH → o1 Hookhook takes 1.00%
- Swap o1 Hook → ETHno liquidity above the price
- Add, then remove liquiditydeposit refused: LiquidityLocked
pool 0xba947fcf0d96551fb40da4428791f6c02628bf5d27e72e284560587675105c40
ETH / MRKT
fee 0%- Swap ETH → MRKThook takes 3.00%
- Swap MRKT → ETHhook takes 2%
- Add, then remove liquiditydeposit refused: LiquidityLocked
pool 0x81fc16417af72aa453ae2065ab2b18dac7ef0ffa91befbc2682d6ccafdfb6c37
Read from the bytecode
- Code size
- 21,519 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 17
- 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.
- 0x0885f732 poolConfig
- 0x1376cad4 effectiveFeeRates
- 0x14bb8fda executeLaunchBuy
- 0x2196478d MAX_LAUNCH_BUY_ROUTE_DATA_LENGTH
- 0x21d0ee70 beforeRemoveLiquidity
- 0x23589a63
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 add liquidity. Can refuse a deposit, or only let some addresses provide liquidity.
- Before remove liquidity. Can refuse a withdrawal. LPs may not get out.
- 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.
launchBuyAdapter
0x259982e5 beforeAddLiquidity0x37ff5190 MAX_TOTAL_FEE_RATE0x3961fed2 setLaunchBuyAdapter0x39d57b02 wired0x485cc955 initialize0x575e24b4 beforeSwap0x5e4807f2 BURN_SINK0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x7831e24a isDividendContract0x79e071af RATE_SCALE0x860048eb seedLiquidity0x8bbf6cbd updateCreatorRights0x91dd7346 unlockCallback0x9f063efc afterAddLiquidity0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc45a0155 unknown0xc4b7de97 feeEscrow0xc4e833ce getHookPermissions0xd5f39488 deployer0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xdfc927c4 registerPool0xe1b4af69 afterDonate0x05f5e100 unknown