Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,242,698
0x1736…E8CC
The eight checks
5 pools use this hook, the first one 6 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 swapA swap through it pays the pool fee and nothing else.
- 03n/a
LPs can get outClosed to outside LPs: only the hook's own liquidity is in the pool.
- 04fail
The fee is the feeThe pool fee stands at 99%, set by the hook. That is on top of anything the hook takes.
- 05caution
No one holds the switchNo owner() but it has setTreasury, setCreatorClaimEscrow, transferGovernance, setReferralBps, setSupportWidth, setShapes.
- 06caution
The code cannot changeThe bytecode contains DELEGATECALL.
- 07pass
Only the PoolManager can call itEach callback refused a call that did not come from the PoolManager.
- 08caution
Track record5 pools, first seen 5 days ago.
Measured at block 93,242,698. 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 & 0x3fff0x28cc · 10100011001100
- 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.
BTFD / WETH
fee dynamic, now 1%- Swap BTFD → WETHnothing taken
- Swap WETH → BTFDnothing taken
- Add, then remove liquiditydeposit refused: AddLiquidityBlocked
pool 0xb4b2b5765dd29c5e189fbad1d95eac57118322ea64eab52cf6819ba0d5252650
RAI / USDG
fee dynamic, now 99%- Swap RAI → USDGhook adds 100%
- Swap USDG → RAIhook adds 100%
- Add, then remove liquiditydeposit refused: AddLiquidityBlocked
pool 0x8603f8c59aafef59a82040332cc65af1775f750cb44f721f0ec255175424caea
Read from the bytecode
- Code size
- 18,262 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- present
- SELFDESTRUCT
- absent
- Outside calls
- 10
- 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.
- 0xdf78bce2 keyOf
- 0xe1b4af69 afterDonate
- 0xecb4b30d registerLaunch
- 0xf0f44260 setTreasury
- 0xf39c38a0 pendingGovernance
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 add liquidity. Can refuse a deposit, or only let some addresses provide liquidity.
- 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.
0xf70a1001
dividendEpoch
0xbad3ea6a dividendDistributor0xbca846c4 setCreatorClaimEscrow0xc45a0155 unknown0xd38bfff4 transferGovernance0xdc98354e beforeInitialize0x91dd7346 unlockCallback0x9878816b supportWidthSpacings0x9f063efc afterAddLiquidity0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0x61d027b3 treasury0x6c2bbe7e afterRemoveLiquidity0x6da829e6 setReferralBps0x6fe7e6eb afterInitialize0x8ed3f888 setSupportWidth0x4cd304a8 setShapes0x575e24b4 beforeSwap0x5a0a3d82 setFeeBeneficiary0x5aa6e675 governance0x5bb47808 setFactory0x60e11913 curveFeeBps0x33fcd2c3 creatorClaimEscrow0x35fd631a extsload0x3fc8cef3 weth0x481c6a75 manager0x492fb343 feeBeneficiary0x21d0ee70 beforeRemoveLiquidity0x238efcbc acceptGovernance0x259982e5 beforeAddLiquidity0x2b10c926 feesFacet0x32516d48 setDividendDistributor0x06094dce treasuryFeesOwed0x0ddf111c referralOwed0x184f9654 shapes0x1e2eaeaf extsload0x1fbb6ff0 referralBps