Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,861,184
0x4e34…a544
The eight checks
212351 pools use this hook, the first one 110 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.
- 02caution
What it takes from a swapIt takes 1.30% of each swap on top of the pool fee.
- 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. It stands at 0.20% now and can change.
- 05caution
No one holds the switchNo owner() but it has updateDynamicLPFee, collectFees, setDopplerHookState, updateBeneficiary, setDopplerHook.
- 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 record212351 pools over 110 days.
Measured at block 92,861,184. 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 & 0x3fff0x2544 · 10010101000100
- 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.
PCAT / PLTR
fee dynamic, now 0.20%- Swap PCAT → PLTRno liquidity below the price
- Swap PLTR → PCAThook takes 1.30%
- Add, then remove liquiditycame back whole
pool 0xc3e8bd3e632ba5723c42c3935ee3206432b5629c45246ebc13c138b807ca8c35
Read from the bytecode
- Code size
- 25,533 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 25
- 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.
- 0x0cf756c2 initialize
- 0x1564cf6c getLastCumulatedFees1
- 0x1bab58f5 getState
- 0x1cab59a4 getBeneficiaries
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5
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.
- After add liquidity. Runs after each deposit.
- After remove liquidity. Runs after each withdrawal.
- After swap. Runs after every swap.
- After swap returns delta. Can take part of what you get out of every swap.
beforeAddLiquidity
0x2b1fd599 getLastCumulatedFees00x51ef8284 delegateAuthority0x575e24b4 beforeSwap0x5a302347 getCumulatedFees10x5ebb58fb getShares0x5ec5db32 exitLiquidity0x5fabcaaf getAuthority0x6c2bbe7e afterRemoveLiquidity0x6fe3ca78 updateDynamicLPFee0x6fe7e6eb afterInitialize0x817db73b collectFees0x91dd7346 unlockCallback0x9f063efc afterAddLiquidity0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc4e833ce getHookPermissions0xc5c4618c setDopplerHookState0xca3b378a isDopplerHookEnabled0xcb7dd8f2 getCumulatedFees00xd44f6738 updateBeneficiary0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xddfc671b setDopplerHook0xe1b4af69 afterDonate0xe5598293 getPoolKey0xf78a8a3e airlock