Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,921,438
0xe7c3…E8CC
The eight checks
51 pools use this hook, the first one 60 d ago.
- 01caution
Permissions that touch your moneyThe address enables 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 1.80% 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 0.30% now and can change.
- 05caution
No one holds the switchNo owner() but it has claimableWei, claim, burnVaultWei, claimTo.
- 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 record51 pools over 59 days.
Measured at block 92,921,438. 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 & 0x3fff0x28cc · 10100011001100
- 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 / EZPZ
fee dynamic, now 0.30%- Swap ETH → EZPZhook takes 0.80%
- Swap EZPZ → ETHhook takes 0.30%
- Add, then remove liquiditycame back whole
pool 0x35c35eb9fcc4c5fbdb5cf8b8bc40f9639ba3789fc42e17da0cd3936113dc7a8d
ETH / WOBBINHWOD
fee dynamic, now 0.30%- Swap ETH → WOBBINHWODhook takes 1.80%
- Swap WOBBINHWOD → ETHhook takes 0.30%
- Add, then remove liquiditycame back whole
pool 0x367dd5ba143196d387e78de748fd8bc710ddc86a1d46df0221769fb7d9daa339
Read from the bytecode
- Code size
- 12,194 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 9
- 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.
- 0x02669b52 launchpad
- 0x0465a7fb claimableWei
- 0x07f64ce3 potLastQualifyingBlock
- 0x0885f732 poolConfig
- 0x1ef7b85a totalFlywheelWei
- 0x21d0ee70 beforeRemoveLiquidity
- 0x242cf2e3
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 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.
MIN_POT_BUY_WEI
0x259982e5 beforeAddLiquidity0x305503cc guardBuyBlock0x359255df configurePool0x367593cc totalPotPaidWei0x40d0417c totalHookFeesWei0x4e71d92d claim0x575e24b4 beforeSwap0x685504a0 nativeClaimBalance0x6c2bbe7e afterRemoveLiquidity0x6d1ae7a1 flywheelRecipient0x6fe7e6eb afterInitialize0x75d0c0dc contractName0x7bf6ec93 burnVaultWei0x8549d9be REQUIRED_FLAGS0x8b8cf67a totalLpDonatedWei0x91dd7346 unlockCallback0x9660aa61 potBuyCount0x9f063efc afterAddLiquidity0xa0a8e460 contractVersion0xa262f5f8 claimTo0xb47b2fb1 afterSwap0xb4eebd6d MIN_SQRT_PRICE_LIMIT0xb6a8b0fa beforeDonate0xc4bebced syncBaseFee0xc6062f29 potWei0xd35829df guardLpEarnedWei0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xdeefdbb4 guardBuyWei0xe06aa567 totalBurnedTokens0xe1b4af69 afterDonate0xf5d333b6 buybackAndBurn