Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,364,087
0x9FeC…60c4
The eight checks
3 pools use this hook, the first one 55 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%, written in the pool key.
- 05caution
No one holds the switchOwned by 0x161ac14179638907B5d53Ef9C4C86CcE3B509EAD. Owner-style functions: setProtocolFeeShare, setFactory, setRegistrar, setProtocolFeeRecipient, transferOwnership.
- 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 54 days.
Measured at block 93,364,087. 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 & 0x3fff0x20c4 · 10000011000100
- 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.
WETH / RSTA
fee 0%- Swap WETH → RSTAhook takes 1%
- Swap RSTA → WETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0x6cb31b4655a2096a611f66adc588837e53c9601565aeea4155390252a423f4ef
WETH / QX91
fee 0%- Swap WETH → QX91hook takes 1%
- Swap QX91 → WETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0x847a3cd04ea9b327ddbe3ea00552fe7f1ea49743b4e73a9b711adf32cca8207e
Read from the bytecode
- Code size
- 10,805 bytes
- Owner
- 0x161ac14179638907B5d53Ef9C4C86CcE3B509EAD
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 4
- 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.
- 0x0621f5d4 launchFeeConfigs
- 0x1ac40d7c setProtocolFeeShare
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x2975067d MAX_CREATOR_TAX_BPS
- 0x307ccc36
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.
- After swap returns delta. Can take part of what you get out of every swap.
MAX_PROTOCOL_FEE_SHARE_BPS
0x43ed9218 totalFeesDelivered0x50a96a5a MAX_OPENING_TAX_BPS0x55c63e39 MAX_OPENING_TAX_BLOCKS0x575e24b4 beforeSwap0x5bb47808 setFactory0x64df049e protocolFeeRecipient0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x7844fbb1 totalHolderFeesDelivered0x79ba5097 acceptOwnership0x89aeca76 registrars0x8a7da940 registerPool0x8da5cb5b owner0x9040f866 protocolFeeShareBps0x9f063efc afterAddLiquidity0xb47b2fb1 afterSwap0xb4b7278c effectiveFeeBps0xb6a8b0fa beforeDonate0xc1bf1dcf setRegistrar0xc45a0155 unknown0xc4e833ce getHookPermissions0xd4175be2 poolIds0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe1f1c4a7 BASIS_POINTS0xe30c3978 pendingOwner0xe521cb92 setProtocolFeeRecipient0xe88791db BASE_FEE_BPS0xe99e8361 registerPoolFor0xf2fde38b transferOwnership