Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,363,385
0x4d70…E0CC
The eight checks
4 pools use this hook, the first one 43 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.
- 02caution
What it takes from a swapIt takes 2.00% of each swap 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 switchNo owner() but it has withdrawProjectFees, withdrawFees.
- 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 record4 pools over 43 days.
Measured at block 93,363,385. 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.
KEEPBON / BONER
fee 0%- Swap KEEPBON → BONERno liquidity below the price
- Swap BONER → KEEPBONhook takes 2.00%
- Add, then remove liquiditycame back whole
pool 0x53fefb5fb7af9a8673f1fab485a5bc8a872161791143f6c31346187e57091f41
ETH / KEEPETH
fee 0%- Swap ETH → KEEPETHhook takes 2.00%
- Swap KEEPETH → ETHno liquidity above the price
- Add, then remove liquiditycame back whole
pool 0x715fd3c6902b590ac6e163aa1e684b45288493d26fdee1b87760823c5c1c73c7
Read from the bytecode
- Code size
- 6,864 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 3
- 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.
- 0x01785603 pendingFees
- 0x02669b52 launchpad
- 0x17f25073 flowExecutor
- 0x21a2a62a platformFeesAccrued
- 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- 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.
0x28151d65
projectFeesWithdrawn
0x320ac4a4 unknown0x3238f7cc projectFeesAccrued0x34f44083 projectTreasury0x45eeb053 MAX_TAX_PIPS0x4974e10e bindExecutor0x558e7c97 totalFeePips0x575e24b4 beforeSwap0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x7b68444f unknown0x803db96d protocolTreasury0x91dd7346 unlockCallback0x9f063efc afterAddLiquidity0xaae49d70 PIPS_DENOMINATOR0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc2898f5e poolTax0xc4e833ce getHookPermissions0xc7b4ea47 withdrawProjectFees0xd18bc037 pendingProjectFees0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xdeeb5310 MIN_TAX_PIPS0xe1b4af69 afterDonate0xebb71194 withdrawFees0xfb99f7f0 unknown0xfe069356 unknown