Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,033,273
0xB63c…e0cC
The eight checks
14 pools use this hook, the first one 32 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 1% on top of the pool fee.
- 03fail
LPs can get outTaking liquidity straight back out lost 100%.
- 04pass
The fee is the feeA fixed fee of 0.30%, written in the pool key.
- 05caution
No one holds the switchOwned by 0x1531901509d9f737Dcf0A51f4DFFc43be523349F. Owner-style functions: setPlatformFeeRecipient, burnThreshold, burnVaultBalance, setFees, setFactory, claimPendingFees.
- 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 record14 pools over 32 days.
Measured at block 93,033,273. 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.
ETH / V6PRE
fee 0.30%- Swap ETH → V6PREhook takes 1.00%
- Swap V6PRE → ETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0x545af3704ce727ebfc89105b79b1a94ac88159a95feac33144f29bfe6245f0a1
CB6 / cbBTC
fee 0.30%- Swap CB6 → cbBTCtoo little liquidity to measure
- Swap cbBTC → CB6hook takes 0.57%
- Add, then remove liquiditylost 100%
pool 0x483395c70102c2ff8ab7978c74ec8833cde913478593f65df8f86535fc596f1a
Read from the bytecode
- Code size
- 15,228 bytes
- Owner
- 0x1531901509d9f737Dcf0A51f4DFFc43be523349F
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 12
- 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.
- 0x04f618cb bindReferrer
- 0x06bfa938 getPoolInfo
- 0x0f04ba67 isFactory
- 0x1246dbf5 hasPool
- 0x1871e243 setPlatformFeeRecipient
- 0x1e592502 referrerShareBps
- 0x2142e7bc burnThreshold
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.