Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,032,049
0xEB0e…50cc
The eight checks
12 pools use this hook, the first one 90 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.
- 02caution
What it takes from a swapIt takes 3% 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 sweepPlatform, sweepVault.
- 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 record12 pools over 89 days.
Measured at block 93,032,049. 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 & 0x3fff0x10cc · 01000011001100
- 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 / RHMACHINES
fee 0%- Swap ETH → RHMACHINEShook takes 2.00%
- Swap RHMACHINES → ETHhook takes 1.90%
- Add, then remove liquiditycame back whole
pool 0x3a9be823bbc2eec4708f71cdcbb812bbec2befd5044c4400ccee0a481731f9d1
ETH / NAT
fee 0%- Swap ETH → NAThook takes 3.00%
- Swap NAT → ETHhook takes 3%
- Add, then remove liquiditycame back whole
pool 0x6d9342a23e00c9ceeb019f9f70260b6f4992924af4c4af9f80852468f2dcb46d
Read from the bytecode
- Code size
- 4,979 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 7
- 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.
- 0x04e8805c totalFeeBps
- 0x08026256 vaultAccrued
- 0x0885f732 poolConfig
- 0x0ebab9ce MIN_CREATOR_BPS
- 0x21d0ee70 beforeRemoveLiquidity
- 0x249d39e9 BPS
bit 4
After donate
bit 3Before swap returns deltabit 2After swap returns deltabit 1After add returns deltabit 0After remove returns delta- After initialize. Runs once, right after 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.
0x259982e5
beforeAddLiquidity
0x539aa77f PLATFORM_FEE_BPS0x575e24b4 beforeSwap0x65d42f03 sweepPlatform0x6c2bbe7e afterRemoveLiquidity0x6c801033 registerPool0x6fe7e6eb afterInitialize0x730a9eb2 redeemClaims0x8549d9be REQUIRED_FLAGS0x91dd7346 unlockCallback0x9f063efc afterAddLiquidity0xa8840006 sweepVault0xb47b2fb1 afterSwap0xb57f4d9c platformAccrued0xb6a8b0fa beforeDonate0xc45a0155 unknown0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe88d1db2 MAX_CREATOR_BPS0xfa2af9da platformWallet