Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,424,947
0x39aa…45C7
The eight checks
3 pools use this hook, the first one 39 d ago.
- 01caution
Permissions that touch your moneyThe address enables after swap returns delta, after add returns delta, after remove 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 0xe4147AAEA0F869F8F389B4c1CF54c2686B864e26. Owner-style functions: setPaused, setOwnerBps, setCreatorBps, setTrustedRouterBatch, setTrustedRouter, withdraw.
- 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 record3 pools over 39 days.
Measured at block 93,424,947. 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 & 0x3fff0x05c7 · 00010111000111
- 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 / HASH
fee dynamic, now 0%- Swap ETH → HASHno liquidity at the current price
- Swap HASH → ETHno liquidity at the current price
- Add, then remove liquiditycame back whole
pool 0x45a509a1b0437d2bb3519ae41af63ce5d38255fd67032f597ee0f86d5f0b267b
Read from the bytecode
- Code size
- 17,913 bytes
- Owner
- 0xe4147AAEA0F869F8F389B4c1CF54c2686B864e26
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 8
- 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.
- 0x091936b6 unknown
- 0x0aedf43f unknown
- 0x16c38b3c setPaused
- 0x18aa3151 unknown
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
bit 4
After donate
bit 3Before swap returns deltabit 2After swap returns deltabit 1After add returns deltabit 0After remove returns delta- After add liquidity. Runs after each deposit.
- After remove liquidity. Runs after each withdrawal.
- 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.
- After add returns delta. Can charge LPs on the way in.
- After remove returns delta. Can take part of what LPs withdraw.
0x265acb63
unknown
0x29f03851 setOwnerBps0x2e914629 unknown0x31a2c28a unknown0x401a6a3f unknown0x46904840 feeRecipient0x50e67a96 unknown0x55606e31 addrInfo0x575e24b4 beforeSwap0x58ad48fd unknown0x593c58e3 unknown0x64c01488 unknown0x66945096 unknown0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x717daec2 unknown0x73fd43e2 unknown0x7d79e7d4 unknown0x8622ebbb decodeConfig0x88378f9d unknown0x8da5cb5b owner0x952e60c2 unknown0x9f063efc afterAddLiquidity0xa307f997 setCreatorBps0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc3185f87 unknown0xc446726a setTrustedRouterBatch0xc45a0155 unknown0xc4e833ce getHookPermissions0xc64f5351 setTrustedRouter0xcc0842e6 unknown0xd274f39c unknown0xd69fb358 unknown0xd9caed12 withdraw0xd9f9d599 unknown0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1a45218 BPS_DENOMINATOR0xe1b4af69 afterDonate0xe4fbb609 CREATOR0xe5096cba unknown0xe52e3820 DEFAULT_CREATOR_BPS0xe74b981b setFeeRecipient0xea05a8c6 setWhitelistOnly0xea5736af unknown0xf2fde38b transferOwnership0xfb9e3a3b setFlag0xfe850e29 unknown