Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,175,331
0x1133…6deC
The eight checks
6 pools use this hook, the first one 28 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 0.19% 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 setPoolConfig, setDirectionalFees, setPlatformShare.
- 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 record6 pools over 28 days.
Measured at block 93,175,331. 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 & 0x3fff0x2dec · 10110111101100
- 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.
WETH / NVDA
fee dynamic, now 0%- Swap WETH → NVDAhook takes 0.05%
- Swap NVDA → WETHhook takes 0.05%
- Add, then remove liquiditycame back whole
pool 0xc99650f31ca68a4093e2114418e7e0a2c99c71672a4629a729041378b22a0b3d
WETH / cbBTC
fee dynamic, now 0%- Swap WETH → cbBTCtoo little liquidity to measure
- Swap cbBTC → WETHhook takes 0.19%
- Add, then remove liquiditycame back whole
pool 0x8ccf4dd274c2113013a717c2f7d89cc5900f7f1b49952f9715cd185dea8376a8
Read from the bytecode
- Code size
- 11,946 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 3
- 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.
- 0x161faa60 getSwapFee
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x28659dbd batchSetDirectionalFees
- 0x424ecd7c platformShareVersion
- 0x42e4e5ca
- Before initialize. Runs once, when a pool is created.
- Before add liquidity. Can refuse a deposit, or only let some addresses provide liquidity.
- After add liquidity. Runs after each deposit.
- After remove liquidity. Runs after each withdrawal.
- 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 donate. Runs before a donation to LPs.
- 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.
setPoolConfig
0x49124af5 setDirectionalFees0x575e24b4 beforeSwap0x61d027b3 treasury0x6236ede4 setPlatformShare0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x791b98bc positionManager0x7b103999 registry0x808342f8 protocolAccessManager0x81140128 quoteDonation0x88f973f0 donationRouter0x95995767 applyDirectionalFeeUpdateFromBatch0x98d15e13 platformShare0x9f063efc afterAddLiquidity0xb3959a85 getPoolFeeState0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xb996be53 isConfigured0xbf7e214f authority0xc4e833ce getHookPermissions0xcd152821 effectiveConfig0xd73792a9 FEE_DENOMINATOR0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe55a9d50 DEFAULT_PLATFORM_SHARE0xed1d58fb initializePoolConfig0xf8717436 initialLiquidityAdded