Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,089,229
0xA398…E0cc
The eight checks
8 pools use this hook, the first one 70 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.
- 02pass
What it takes from a swapIt takes 1% 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 setFactory, 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 record8 pools over 70 days.
Measured at block 93,089,229. 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.
ETH / RWIN
fee 0%- Swap ETH → RWINhook takes 1.00%
- Swap RWIN → ETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0xdba5ee9695728b64d16fa463e57e9dd4f98099d00cffddbe80ca08407e8b3976
ETH / TEST
fee 0%- Swap ETH → TESThook takes 1.00%
- Swap TEST → ETHno liquidity above the price
- Add, then remove liquiditycame back whole
pool 0x84a17fb1f18791419d7b28b032c97828192ef63898c7dff4cf3cd3afcfb00ec1
Read from the bytecode
- Code size
- 14,947 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 5
- 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.
- 0xddbf413a startLaunch
- 0xe1b4af69 afterDonate
- 0xe74ec265 OBSERVATION_CARDINALITY
- 0xf11457c7 oracleState
- 0xd2f4193b REQUIRED_POOL_LP_FEE
- 0xd919b6bd SNIPE_DURATION
- 0xdc4c90d3
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.
poolManager
0xdc98354e beforeInitialize0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc45a0155 unknown0xc4e833ce getHookPermissions0x91dd7346 unlockCallback0x976ba7f8 finalizeLaunch0x9f063efc afterAddLiquidity0xac4e4054 REQUIRED_HOOK_FLAGS0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x786e0838 bootstrapper0x791a73e6 currentFeeBps0x47473b00 consult0x575e24b4 beforeSwap0x5bb47808 setFactory0x61dcfd82 settleFees0x259982e5 beforeAddLiquidity0x2791263a observation0x2b76b49c launchState0x3882d394 OBSERVATION_INTERVAL0x06832117 isRegisteredFeeVault0x136c77f1 registerPool0x1a65893b MIN_TWAP_WINDOW0x21d0ee70 beforeRemoveLiquidity