Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,207,033
0x8934…6044
The eight checks
5 pools use this hook, the first one 41 d ago.
- 01caution
Permissions that touch your moneyThe address enables after swap returns delta. The hook is allowed to take; the next two checks measure whether it does.
- 02pass
What it takes from a swapIt takes 1% 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 switchOwned by 0xA5b7c4C651f787debDECd6d7bf6346E35406D18d. Owner-style functions: setExecutor, setFactory, setBuybackVault, setCreatorFeeRecipient, transferOwnership.
- 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 record5 pools over 41 days.
Measured at block 93,207,033. 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 & 0x3fff0x2044 · 10000001000100
- 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 / SEED
fee 0%- Swap ETH → SEEDhook takes 1%
- Swap SEED → ETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0x574596ca78e0ec91044f9c72d3a07c952892ee3219e6a2fb0f85d4e424d62237
ETH / BEAN
fee 0%- Swap ETH → BEANhook takes 1%
- Swap BEAN → ETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0x0c724de58335bd684d8ffa67a8194c0beefa042b563c63b9ee6717574b4838a1
Read from the bytecode
- Code size
- 11,339 bytes
- Owner
- 0xA5b7c4C651f787debDECd6d7bf6346E35406D18d
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 16
- 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.
- 0x09f2c019 getPoolInfo
- 0x12381a67 executeBuyback
- 0x1c3c0ea8 setExecutor
- 0x21d0ee70 beforeRemoveLiquidity
- 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.
- After swap. Runs after every swap.
- After swap returns delta. Can take part of what you get out of every swap.
0x575e24b4
beforeSwap
0x5bb47808 setFactory0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x7862505c setBuybackVault0x8da5cb5b owner0x91dd7346 unlockCallback0x9f063efc afterAddLiquidity0xa9bc5b53 KEEPER_REWARD_BPS0xac24d97e MAX_INTERNAL_SLIPPAGE_BPS0xad091230 launches0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc34c08e5 executor0xc34d6171 registerPool0xc3fcd8c5 pendingBuyback0xc45a0155 unknown0xc4b7de97 feeEscrow0xc4e833ce getHookPermissions0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe5598293 getPoolKey0xe594ee35 canExecuteBuyback0xe9702d27 lastSwapBlock0xed8ef7a3 setCreatorFeeRecipient0xf1f5c993 buybackVault0xf2fde38b transferOwnership