Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,889,731
0xc078…00C4
The eight checks
170 pools use this hook, the first one 89 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.
- 02caution
What it takes from a swapIt takes 1.50% of each swap on top of the pool fee.
- 03pass
LPs can get outLiquidity added and removed in the same block came back whole.
- 04caution
The fee is the feeIts pools use a dynamic fee that the hook sets before every swap. It stands at 0% now and can change.
- 05caution
No one holds the switchNo owner() but it has settleEpoch.
- 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 record170 pools over 88 days.
Measured at block 92,889,731. 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 & 0x3fff0x00c4 · 00000011000100
- 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 / GHOST
fee dynamic, now 0%- Swap ETH → GHOSThook takes 1.50%
- Swap GHOST → ETHhook takes 1.50%
- Add, then remove liquiditycame back whole
pool 0x7d7a2f3d5a40a53901dc5a525d55174033dc4e116657d365306af0a2a847ea25
ETH / 永生果蝇
fee dynamic, now 0%- Swap ETH → 永生果蝇hook takes 1.50%
- Swap 永生果蝇 → ETHno liquidity above the price
- Add, then remove liquiditycame back whole
pool 0xd21d00dba6ac2c89687c2da41f5330f3427692b936d646e47c5c0ba033efe78b
Read from the bytecode
- Code size
- 9,645 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.
- 0xe1b4af69 afterDonate
- 0xf1649121 pendingSell
- 0xf6c00927 getPool
- 0xdc4c90d3 poolManager
- 0xdc98354e beforeInitialize
- 0xc5e153f7 feeBps
- 0xcee5eb2e
bit 4
After donate
bit 3Before swap returns deltabit 2After swap returns deltabit 1After add returns deltabit 0After remove returns delta- Before swap. Runs before every swap. On a dynamic-fee pool it can set the fee each time.
- After swap. Runs after every swap.
- After swap returns delta. Can take part of what you get out of every swap.
graduationThreshold
0xd3fd6631 markGraduated0xd7b96d4e locker0xbb443aeb feeBpsForMc0xbdb89858 graduationProgressBps0xc45a0155 unknown0xc4e833ce getHookPermissions0x902d55a5 TOTAL_SUPPLY0x9f063efc afterAddLiquidity0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0x6fe7e6eb afterInitialize0x724aa4af settleEpoch0x8549d9be REQUIRED_FLAGS0x65d7b483 poolIdOfToken0x6c2bbe7e afterRemoveLiquidity0x533b5b9a registerPool0x54608220 releaseSwapFees0x56bf5ddc creatorBps0x575e24b4 beforeSwap0x21d0ee70 beforeRemoveLiquidity0x259982e5 beforeAddLiquidity0x2721b788 isGraduated0x5315769b graduationReady0x03288707 accumulatedEth0x0a5294e9 marketCap0x18bce47b creatorBpsForMc0x1cc62519 epochTally