Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,457,382
0x0E92…20Cc
The eight checks
3 pools use this hook, the first one 16 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 3% of each swap on top of the pool fee.
- 03pass
LPs can get outLiquidity added and removed in the same block came back whole.
- 04pass
The fee is the feeA fixed fee of 0%, written in the pool key.
- 05caution
No one holds the switchNo owner() but it has sweepPoolOperationsFees, sweepPoolQuoteFees, setFeeVaultOnce.
- 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 16 days.
Measured at block 93,457,382. 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.
CUCKSY / CUCK
fee 0%- Swap CUCKSY → CUCKhook takes 3%
- Swap CUCK → CUCKSYhook takes 3%
- Add, then remove liquiditycame back whole
pool 0x911c91d25fe1786e310bbc922056c81a84450ed46209c38b9e2bc312468cf2f5
KUJI / CUCK
fee 0%- Swap KUJI → CUCKhook takes 3%
- Swap CUCK → KUJIhook takes 3%
- Add, then remove liquiditycame back whole
pool 0xa76e07d4efa87291c46297d6fffa0dc380807750654f12ef9e750291096a6150
Read from the bytecode
- Code size
- 8,459 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 11
- 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.
- 0x0b606b36 totalSweptByPool
- 0x0fccca7b feeOperator
- 0x169409b1 sweepPoolOperationsFees
- 0x21d0ee70 beforeRemoveLiquidity
- 0x249d39e9 BPS
- 0x259982e5 beforeAddLiquidity
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.