Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,063,163
0x5dF2…0044
The eight checks
10 pools use this hook, the first one 40 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 1.08% of each swap on top of the pool fee.
- 03fail
LPs can get outTaking liquidity straight back out lost 100%.
- 04pass
The fee is the feeA fixed fee of 0.30%, written in the pool key.
- 05caution
No one holds the switchOwned by 0x1531901509d9f737Dcf0A51f4DFFc43be523349F. Owner-style functions: setPlatformFeeRecipient, burnThreshold, setSwapRouter, burnVaultBalance, setFees, setFactory.
- 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 record10 pools over 39 days.
Measured at block 93,063,163. 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 & 0x3fff0x0044 · 00000001000100
- 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.
TEST AMD / AMD
fee 0.30%- Swap TEST AMD → AMDhook takes 1%
- Swap AMD → TEST AMDhook takes 1%
- Add, then remove liquiditycame back whole
pool 0x788d4c61e6abbae3f29382238fb2e507803e8dc79c1daa9c222f9b2b097f8270
CBTEST / cbBTC
fee 0.30%- Swap CBTEST → cbBTCtoo little liquidity to measure
- Swap cbBTC → CBTESThook takes 1.08%
- Add, then remove liquiditylost 100%
pool 0x48f69f3320f4084e5ba0c8cd4dd8631bd50baff275138a053798df0e1d6c00cf
Read from the bytecode
- Code size
- 8,437 bytes
- Owner
- 0x1531901509d9f737Dcf0A51f4DFFc43be523349F
- 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.
- 0x010a6c77 unknown
- 0x04f618cb bindReferrer
- 0x096b6d5d poolCreatedAt
- 0x0ae89127 tokenOfPool
- 0x0f04ba67 isFactory
- 0x1871e243 setPlatformFeeRecipient
- 0x1e592502 referrerShareBps
bit 4
After donate
bit 3Before swap returns deltabit 2After swap returns deltabit 1After add returns deltabit 0After remove returns delta- After swap. Runs after every swap.
- After swap returns delta. Can take part of what you get out of every swap.