Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,114,238
0x57F9…80CC
The eight checks
8 pools use this hook, the first one 41 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 2.51% 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 0.30%, written in the pool key.
- 05caution
No one holds the switchOwned by 0x321974266f99FB6cc48bE9F59C7F7e38A2C65120. Owner-style functions: setTaxExemptSender, claimRedeemer, setPoolApproved, setClaimRedeemer, 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 record8 pools over 40 days.
Measured at block 93,114,238. 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 & 0x3fff0x00cc · 00000011001100
- 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.
KITSU / IMX5
fee 0.30%- Swap KITSU → IMX5hook takes 2.51%
- Swap IMX5 → KITSUhook takes 2.51%
- Add, then remove liquiditycame back whole
pool 0x8a4632880e9db27262cd425d30043203de5ba46d464eb6fec7bc55163e57a3dd
CASHCAT / IMX5
fee 0.30%- Swap CASHCAT → IMX5hook takes 2.51%
- Swap IMX5 → CASHCAThook takes 2.51%
- Add, then remove liquiditycame back whole
pool 0x6b90960b4315089cf3afd6410b0f0affee0d0f6650bb894180917700247d01b9
Read from the bytecode
- Code size
- 18,383 bytes
- Owner
- 0x321974266f99FB6cc48bE9F59C7F7e38A2C65120
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 9
- 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.
- 0x0c73cf3a LP_FEE_DENOMINATOR
- 0x16387b8d setTaxExemptSender
- 0x21d0ee70 beforeRemoveLiquidity
- 0x249d39e9 BPS
- 0x259982e5 beforeAddLiquidity
- 0x30597a78 claimRedeemer
bit 4
After donate
bit 3Before swap returns deltabit 2After swap returns deltabit 1After add returns deltabit 0After remove returns delta- 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.