Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,116,401
0x4949…80C4
The eight checks
9 pools use this hook, the first one 34 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.
- 02n/a
What it takes from a swapNo pool with liquidity to swap through yet.
- 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 0% now and can change.
- 05caution
No one holds the switchOwned by 0xBa406836761014938D88414DcaE18D0f1ccE0E19. Owner-style functions: setWhitelistOnly, transferOwnership, setFees, setTrustedOrigin, withdraw, setFeeRecipient.
- 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 record9 pools over 33 days.
Measured at block 93,116,401. 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 & 0x3fff0x00c4 · 00000011000100
- 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.
WALLET / USDG
fee dynamic, now 0%- Swap WALLET → USDGno liquidity at the current price
- Swap USDG → WALLETno liquidity at the current price
- Add, then remove liquiditycame back whole
pool 0x4bb96d1e8ee8f3ceef923489fd43a1758721243ef6eb27a249e45be23d8c5fe1
Read from the bytecode
- Code size
- 13,899 bytes
- Owner
- 0xBa406836761014938D88414DcaE18D0f1ccE0E19
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 5
- 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.
- 0xea05a8c6 setWhitelistOnly
- 0xf06b0b50 unknown
- 0xf2fde38b transferOwnership
- 0xfa4634a0 setFees
- 0xfda88300 unknown
- 0xfff84cd6 setTrustedOrigin
- 0xd9caed12 withdraw
bit 4
After donate
bit 3Before swap returns deltabit 2After swap returns deltabit 1After add returns deltabit 0After remove returns delta- Before swap. Runs before every swap. On a dynamic-fee pool it can set the fee each time.
- After swap. Runs after every swap.
- After swap returns delta. Can take part of what you get out of every swap.