Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,328,056
0xA589…e0CC
The eight checks
3 pools use this hook, the first one 81 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 1.05% 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 settleFees.
- 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 81 days.
Measured at block 93,328,056. 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.
PEPE / RON
fee 0%- Swap PEPE → RONhook takes 1.05%
- Swap RON → PEPEhook takes 1.05%
- Add, then remove liquiditycame back whole
pool 0xd011fa9937fa76842255df9f285ef5a13a1f6a9f361d279de17050abbd187760
PEPE / JUSTME
fee 0%- Swap PEPE → JUSTMEhook takes 1.05%
- Swap JUSTME → PEPEno liquidity above the price
- Add, then remove liquiditycame back whole
pool 0x31251087586c6a39486852b8e667fa098e095b2e35c4c9a73c584b97234c4efe
Read from the bytecode
- Code size
- 7,028 bytes
- Owner
- none found
- 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.
- 0x01785603 pendingFees
- 0x18fe11dc registeredPool
- 0x192308ac unknown
- 0x1d8c3899 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- 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.
0x46111e7a
pepe
0x539aa77f PLATFORM_FEE_BPS0x575e24b4 beforeSwap0x583d434f FEE_BPS_DENOMINATOR0x606003e8 HOOK_VERSION0x6c2bbe7e afterRemoveLiquidity0x6f28507c TOTAL_FEE_BPS0x6fe7e6eb afterInitialize0x7381527f POOL_TICK_SPACING0x83d1db33 quoteFees0x84290a76 POOL_LP_FEE0x91dd7346 unlockCallback0x9f063efc afterAddLiquidity0xa409e545 unknown0xa7141d87 unknown0xb395753f settleFees0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc45a0155 unknown0xc4b7de97 feeEscrow0xc4e833ce getHookPermissions0xce07d308 registerPool0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xee3d78a3 BENEFICIARY_FEE_BPS