Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,981,897
0x08E5…A080
The eight checks
37 pools use this hook, the first one 45 d ago.
- 01pass
Permissions that touch your moneyNone of the permissions that let a hook take from swaps or from LPs are switched on.
- 02pass
What it takes from a swapIt takes 1.00% 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 before every swap. It stands at 0% now and can change.
- 05caution
No one holds the switchNo owner() but it has claimFeeBps, transferFrom, pausedUntil, setDistributor, setPoolPaused, sweepDistributor.
- 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 record37 pools over 45 days.
Measured at block 92,981,897. 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 & 0x3fff0x2080 · 10000010000000
- 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.
USDG / KSKD
fee dynamic, now 0%- Swap USDG → KSKDhook takes 0.75%
- Swap KSKD → USDGhook takes 1.00%
- Add, then remove liquiditycame back whole
pool 0x806628a7d5dea7679c1947b14997643c72db0b867aa6250d2454728990414ed8
frxUSD / SPY
fee dynamic, now 0%- Swap frxUSD → SPYhook takes 0.30%
- Swap SPY → frxUSDhook takes 0.30%
- Add, then remove liquiditycame back whole
pool 0x3e6fd764d07df0f76cc6d33c4153f05b64705fbd1fb604bf6b5a4a1b4b158be6
Read from the bytecode
- Code size
- 32,997 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 13
- 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.
- 0xe74c37f7 ballotGate
- 0xe8574e8a claimFeeBps
- 0xf69ec158 MAX_CLAIM_FEE_BPS
- 0xf8c543ce MAX_CLAIM_FEE_WALK
- 0xfe99049a transferFrom
- 0xda748b10 pausedUntil
- 0xdaf58566 unstake
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.