Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,999,461
0x28EB…A0cc
The eight checks
17 pools use this hook, the first one 36 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.
- 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.
- 04pass
The fee is the feeA fixed fee of 1%, written in the pool key.
- 05caution
No one holds the switchNo owner() but it has setV3PayoutRoute, setV4PayoutRoute, setDefaultV4PayoutRoute.
- 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 record17 pools over 35 days.
Measured at block 92,999,461. 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.
KURUMI / fxJPY
fee 1%- Swap KURUMI → fxJPYno liquidity at the current price
- Swap fxJPY → KURUMIno liquidity at the current price
- Add, then remove liquiditycame back whole
pool 0x17c5e2d74359c6efe589dd9e693d5a19c4280ace0e8c0538b8fa35be64f18017
Read from the bytecode
- Code size
- 22,652 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.
- 0xdc98354e beforeInitialize
- 0xdced6230 bindLauncher
- 0xe1b4af69 afterDonate
- 0xea750ed7 PROTOCOL_TAX_BPS
- 0xeba96498 defaultQuoteFee
- 0xc4e833ce getHookPermissions
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.
0xd81804c3
distribute
0xd866dc9d creatorEarnings0xdc4c90d3 poolManager0xdc726205 rates0xacba7b42 binder0xb32f0947 defaultEthSpacing0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xbf786d59 payoutRoutes0x91dd7346 unlockCallback0x941f5d25 protocolRecipient0x9c908e04 defaultEthFee0x9f063efc afterAddLiquidity0xa5ec5473 defaultBridge0x658c3d1e setV3PayoutRoute0x65b3f8ef setV4PayoutRoute0x699900c1 MIN_TAX_BPS0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x534e1f14 defaultQuoteSpacing0x552117ac pendingProtocol0x575e24b4 beforeSwap0x5b7caecb paidCreator0x61e512f6 pendingCreator0x259982e5 beforeAddLiquidity0x2c597de9 MAX_TAX_BPS0x2d63e01d registerRate0x3fc8cef3 weth0x51293286 paidProtocol0x0f0888ba setDefaultV4PayoutRoute0x16eebd1e launcher0x1865e9d1 v3SwapRouter0x21d0ee70 beforeRemoveLiquidity