Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,421,269
0x1832…60cC
The eight checks
3 pools use this hook, the first one 20 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.
- 02pass
What it takes from a swapIt takes 0.25% on top of the pool fee.
- 03caution
LPs can get outTaking liquidity straight back out lost 0.64%.
- 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.
- 05pass
No one holds the switchNo owner and no admin functions found.
- 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 record3 pools over 19 days.
Measured at block 93,421,269. 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 & 0x3fff0x20cc · 10000011001100
- 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.
SHRED / NVDA
fee dynamic, now 0%- Swap SHRED → NVDAhook takes 0.25%
- Swap NVDA → SHREDhook takes 0.25%
- Add, then remove liquiditycame back whole
pool 0xe576b8be706545294d47b33988556a4dabf38dbd9888c3adb9137832b60737f3
SHRED / USDG
fee dynamic, now 0%- Swap SHRED → USDGhook takes 0.25%
- Swap USDG → SHREDhook takes 0.25%
- Add, then remove liquiditylost 0.64%
pool 0xeddb1496eee9d7fecc95eb61ff496deeec8b29674f071936225c111e962c079a
Read from the bytecode
- Code size
- 20,043 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 6
- 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.
- 0x07eff0dd MIN_TICK_SPACING
- 0x20b6b2fc pendingRevenue
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x36f01fcc PULP
- 0x3ae8afed cumulativeRevenueByPool
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 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.