Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,949,202
0xCacd…A0CC
The eight checks
26 pools use this hook, the first one 7 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 5.00% 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 grantRole.
- 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 record26 pools over 7 days.
Measured at block 92,949,202. 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.
FULLHEAL / ¥
fee 0%- Swap FULLHEAL → ¥hook takes 5.00%
- Swap ¥ → FULLHEALhook takes 4.76%
- Add, then remove liquiditycame back whole
pool 0xcbb4887e307f7f8b3904f7f0720a2684e778871d0c856f0ab64169d5e93c2d97
AWAKE / ¥
fee 0%- Swap AWAKE → ¥hook takes 5.00%
- Swap ¥ → AWAKEhook takes 4.76%
- Add, then remove liquiditycame back whole
pool 0x54d05d5171e869c52e11f799b2e183ad2b90a4723c2c9ebc5ef6c0eb2a27772a
Read from the bytecode
- Code size
- 9,687 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 9
- 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.
- 0x01ffc9a7 supportsInterface
- 0x062755d7 registerItem
- 0x1f456963 itemHasPool
- 0x21d0ee70 beforeRemoveLiquidity
- 0x224438d1 pendingFees
- 0x225be105 applyFees
- 0x23cbe1f3
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.
sellFeeBps
0x248a9ca3 getRoleAdmin0x259982e5 beforeAddLiquidity0x298ca5c4 yenIsCurrency00x2f2ff15d grantRole0x36568abe renounceRole0x3cd8045e splitter0x46ca626b TICK_SPACING0x536625b9 cancelFees0x5748b439 createItemPools0x575e24b4 beforeSwap0x5b34eba0 checkpoint0x6b3d576a flush0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x7122098d proposeFees0x77d2300e buyFeeBps0x828c4eda itemOf0x91d14854 hasRole0x91dd7346 unlockCallback0x9f063efc afterAddLiquidity0xa217fddf DEFAULT_ADMIN_ROLE0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xb8de08cf netSold0xbe3d34c6 isItemPool0xc4e833ce getHookPermissions0xcc221edc yen0xd547741f revokeRole0xd55be8c6 MAX_FEE_BPS0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xead68f82 CHECKPOINT_INTERVAL0xf12b7132 registeredItem0xf92f23a7 accrued0xfa2f3095 FEE_DELAY