Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,296,606
0xC059…a044
The eight checks
4 pools use this hook, the first one 35 d ago.
- 01caution
Permissions that touch your moneyThe address enables 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.
- 03pass
LPs can get outLiquidity added and removed in the same block came back whole.
- 04pass
The fee is the feeA fixed fee of 0.30%, 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 record4 pools over 34 days.
Measured at block 93,296,606. 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 & 0x3fff0x2044 · 10000001000100
- 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 / PTEST
fee 0.30%- Swap ETH → PTESThook takes 1%
- Swap PTEST → ETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0x11414a21d059d2f8b5f26bd9797db386aba36671fb40dd1add7b16cdb8e363f4
ETH / PENGU
fee 0.30%- Swap ETH → PENGUhook takes 1%
- Swap PENGU → ETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0xc0728dad09f8fe73fc7739e7e249e23489b8293dcca5aa53335194007ad831fa
Read from the bytecode
- Code size
- 13,934 bytes
- Owner
- 0x1531901509d9f737Dcf0A51f4DFFc43be523349F
- 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.
- 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.
- After swap. Runs after every swap.
- After swap returns delta. Can take part of what you get out of every swap.