Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,921,932
0x9c27…90Cc
The eight checks
67 pools use this hook, the first one 89 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 6.90% 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 1% now and can change.
- 05caution
No one holds the switchOwned by 0x57d783F8a2877450689534d1860e44B09b3f7ABf. Owner-style functions: setConversionSlippage, setWhitelistConfig, setCooldownConfig, setRewardSwapConfig, updateAdminFee, setInitialConfig.
- 06caution
The code cannot changeThe bytecode contains DELEGATECALL.
- 07pass
Only the PoolManager can call itEach callback refused a call that did not come from the PoolManager.
- 08pass
Track record67 pools over 89 days.
Measured at block 92,921,932. 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 & 0x3fff0x10cc · 01000011001100
- 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 / Utest
fee dynamic, now 1%- Swap ETH → Utesthook takes 6.90%
- Swap Utest → ETHhook takes 6.90%
- Add, then remove liquiditycame back whole
pool 0x17b5ceaf3cc607e3dff5d71e4bfd22c2dc074901393a24eca1adfccdcd8abb76
ETH / UV4
fee dynamic, now 1%- Swap ETH → UV4hook takes 3.50%
- Swap UV4 → ETHhook takes 3.50%
- Add, then remove liquiditycame back whole
pool 0xd46d338905064f800bf78c683e2a492eb069470c9d4238ef4990bc4383980185
Read from the bytecode
- Code size
- 24,299 bytes
- Owner
- 0x57d783F8a2877450689534d1860e44B09b3f7ABf
- Proxy
- no
- DELEGATECALL
- present
- SELFDESTRUCT
- absent
- Outside calls
- 3
- 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.
- 0x0819f712 batchSetPoolFeeAndDistributionConfig
- 0x1cb429dc setConversionSlippage
- 0x1ff8d3f6 setWhitelistConfig
bit 4
After donate
bit 3Before swap returns deltabit 2After swap returns deltabit 1After add returns deltabit 0After remove returns delta- After initialize. Runs once, right after a pool is created.
- 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.
0x21d0ee70
beforeRemoveLiquidity
0x259982e5 beforeAddLiquidity0x40bcf250 setCooldownConfig0x47930cf5 setRewardSwapConfig0x49b9edc4 updateAdminFee0x53a73fb2 simulateSwapTick0x575e24b4 beforeSwap0x6c2bbe7e afterRemoveLiquidity0x6ca9787e distributeFee0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x7b6c4f54 setInitialConfig0x84d6780a cancelAntiSandwichBatch0x87ccfa82 getDynamicFeeState0x8a966bab initializeTickForAntiSandwichBatched0x8da5cb5b owner0x91dd7346 unlockCallback0x9f063efc afterAddLiquidity0xa5e804e2 updateWhitelistWallets0xa7539b71 transferOwnershipOfPool0xb3abdf88 getAntiSandwichBatchProgress0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc4e833ce getHookPermissions0xc5be96c2 getPoolFullConfig0xdbec7d9e distributeAdminFees0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe0c3c115 setAntiSandwich0xe1b4af69 afterDonate0xf0fa9eb6 setFeeThreshold0xf2fde38b transferOwnership0xf4099811 isWhitelisted0xf6bf16e6 initializeTickForAntiSandwich