Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,116,461
0x7358…90Cc
The eight checks
10 pools use this hook, the first one 92 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.
- 02fail
What it takes from a swapOne direction works and the other is refused (PriceLimitAlreadyExceeded). You may be able to buy and not sell.
- 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 0xDb15B843A28933168104B9d6939f961703C5060f. Owner-style functions: setFeeThreshold, setWhitelistConfig, setCooldownConfig, updateAdminFee, setRewardSwapConfig, 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 record10 pools over 92 days.
Measured at block 93,116,461. 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 / PKS
fee dynamic, now 1%- Swap ETH → PKShook takes 3.50%
- Swap PKS → ETHhook takes 3.50%
- Add, then remove liquiditycame back whole
pool 0xfbacfacb9861b1c2950b9f13aa87f170b58dbb102c8228f50d88ab9362263e19
ETH / PKS
fee dynamic, now 1%- Swap ETH → PKSrefused: PriceLimitAlreadyExceeded
- Swap PKS → ETHhook takes 3.50%
- Add, then remove liquiditycame back whole
pool 0xcc812b070654413b641e361789cbb266bda66c4357f1e40cfa3cb128948d4131
Read from the bytecode
- Code size
- 22,791 bytes
- Owner
- 0xDb15B843A28933168104B9d6939f961703C5060f
- 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.
- 0x168eb5fe setFeeThreshold
- 0x1ff8d3f6 setWhitelistConfig
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x40bcf250 setCooldownConfig
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.