Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,948,290
0x091c…2aEc
The eight checks
31 pools use this hook, the first one 82 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 4% 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 claimVault.
- 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 record31 pools over 82 days.
Measured at block 92,948,290. 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 & 0x3fff0x2aec · 10101011101100
- 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 / LIMEGREEN
fee 0%- Swap ETH → LIMEGREENhook takes 2.00%
- Swap LIMEGREEN → ETHhook takes 2%
- Add, then remove liquiditydeposit refused: NoActiveAuthorization
pool 0xabcdf365102545c738b72869e0e755c3a7e5763e983cdf5bbda5547cc9bcc591
ETH / CATCASH
fee 0%- Swap ETH → CATCASHhook takes 4.00%
- Swap CATCASH → ETHhook takes 4%
- Add, then remove liquiditydeposit refused: NoActiveAuthorization
pool 0x82cbfc87ad4b77a55171e33f89a2f43f4b464da4795996b0d0e56db4efdefffb
Read from the bytecode
- Code size
- 9,489 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 2
- 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.
- 0x066ada90 poolStatus
- 0x16c07cc4 BASIC_FEE_CAP_BPS
- 0x1ac776ab utilityRedeemed
- 0x21d0ee70 beforeRemoveLiquidity
- 0x249d39e9 BPS
- 0x259982e5 beforeAddLiquidity
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 donate. Runs before a donation to LPs.
- 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.
0x282603e5
rewardsRedeemed
0x293231e0 poolShareConfig0x47ebe54d launchManager0x4c2f99ed REQUIRED_MASK0x575e24b4 beforeSwap0x58a47646 platformLiability0x6190daa2 assertLaunchAuthorizationConsumed0x6494085a creatorRedeemed0x6c2bbe7e afterRemoveLiquidity0x6c948683 poolFeeAccrued0x6e8cc868 utilityLiability0x6fe7e6eb afterInitialize0x80798847 platformRedeemed0x8cd7825f poolFeeConfig0x95e595de MIN_TOTAL_FEE_BPS0x9f063efc afterAddLiquidity0xa9164e02 MIN_PLATFORM_TRADE_FEE_BPS0xa99cc083 creatorLiability0xab518e6e claimVault0xadb53103 rewardsLiability0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xb6dc2149 authorizedSweeper0xba8b6b11 UTILITY_FEE_CAP_BPS0xc07e185a authorizeRedemption0xc0d2a1c4 poolRecipients0xc3dbb149 registerPoolConfig0xc4e833ce getHookPermissions0xcebe37fe poolAlreadyHasPosition0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xee296977 registerLaunchAuthorization0xfeae0fd6 launchAuthorizationStatus