Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,114,290
0xE10f…bacc
The eight checks
8 pools use this hook, the first one 39 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 2.10% 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.
- 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 switchOwned by 0xEC9eF7e127Ab95fe30DA686E2313097803e80F17. Owner-style functions: setPlatformFeeRecipient, claim, setDev, transferOwnership, setLauncher.
- 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 record8 pools over 39 days.
Measured at block 93,114,290. 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 & 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 / DIV
fee dynamic, now 0%- Swap ETH → DIVhook takes 0.01%
- Swap DIV → ETHtoo little liquidity to measure
- Add, then remove liquiditydeposit refused: RdogHook: liquidity is seeded at birth
pool 0x48fcbd69ef1715689bda754af8a2fa6740e5b360632bf83c6c76067a12736091
ETH / 3
fee dynamic, now 0%- Swap ETH → 3hook takes 2.10%
- Swap 3 → ETHhook takes 2.10%
- Add, then remove liquiditydeposit refused: RdogHook: liquidity is seeded at birth
pool 0x9d2a9b9b1e43c338543f12cd0c16766f6ab08087436b17c1695d48877aeaf80c
Read from the bytecode
- Code size
- 14,469 bytes
- Owner
- 0xEC9eF7e127Ab95fe30DA686E2313097803e80F17
- 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.
- 0x01d2dc7e unknown
- 0x03dfc7c6 unknown
- 0x090376bb devOf
- 0x0e68ec95 config
- 0x0ed52473 ACC
- 0x1606db19 pendingOf
- 0x16eebd1e launcher
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.
0x1871e243
setPlatformFeeRecipient
0x1e83409a claim0x21d0ee70 beforeRemoveLiquidity0x249d39e9 BPS0x259982e5 beforeAddLiquidity0x2c597de9 MAX_TAX_BPS0x37ee0fed unknown0x41861b10 buybackAndBurn0x46ca626b TICK_SPACING0x539aa77f PLATFORM_FEE_BPS0x53cc973b totalBurned0x575e24b4 beforeSwap0x5dcea4d4 accRewardPerShare0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x7b4717a4 rewardDebt0x821b4738 unknown0x8c9f5f05 setDev0x8da5cb5b owner0x91dd7346 unlockCallback0x9a565cb8 unknown0x9ca0a1b0 fundReward0x9ced7e76 pendingReward0x9f063efc afterAddLiquidity0xb1c77326 upperTick0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xeb13554f platformFeeRecipient0xf2fde38b transferOwnership0xf4c094c8 setLauncher0xfdc39fa3 DYNAMIC_FEE0xff5cc01c unknown