Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,976,545
0x7f7f…3ACC
The eight checks
18 pools use this hook, the first one 22 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.
- 02fail
What it takes from a swapEvery swap through it was refused: V4UnsupportedRouter. Only an approved router may get through.
- 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 claim.
- 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 record18 pools over 21 days.
Measured at block 92,976,545. 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 & 0x3fff0x3acc · 11101011001100
- 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 / BUFFY
fee 0%- Swap ETH → BUFFYrefused: V4UnsupportedRouter
- Swap BUFFY → ETHrefused: V4UnsupportedRouter
- Add, then remove liquiditydeposit refused: V4LiquidityLocked
pool 0xb8b8bfd4a2f91d70ea29c5722672fabc890d3240afa264316935a04f3553064b
Read from the bytecode
- Code size
- 18,989 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 13
- 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.
- 0x1e83409a claim
- 0x210ab51a quoteLiability
- 0x214013ca launch
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x28079e4a owed
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.
- After initialize. Runs once, right after 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.
0x2f239fbc
validatePoolDelivery
0x30040054 poolIdOf0x35a9e4df universalRouter0x55d1cb60 poolKey0x575e24b4 beforeSwap0x592f4e18 rewardProcessor0x61c6e5e2 configure0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x8549d9be REQUIRED_FLAGS0x86b6dd08 lockLiquidity0x8ce74426 protocol0x91dd7346 unlockCallback0x9f063efc afterAddLiquidity0xa7a9a62c marketState0xb0019174 whitelisted0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xbd9a8dd3 rewardRoute0xc45a0155 unknown0xc5760a74 splitRecipients0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe27b4e8e releaseCreatorAllocation0xf887ea40 router0xff095d1b universalQuoter