Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,116,506
0x09Cb…EACc
The eight checks
10 pools use this hook, the first one 12 d ago.
- 01caution
Permissions that touch your moneyThe address enables before remove liquidity, 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 1.00% of each swap on top of the pool fee.
- 03n/a
LPs can get outClosed to outside LPs: only the hook's own liquidity is in the pool.
- 04caution
The fee is the feeIts pools use a dynamic fee that the hook sets before every swap. It stands at 3% now and can change.
- 05caution
No one holds the switchNo owner() but it has claimSystemFees.
- 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 11 days.
Measured at block 93,116,506. 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 & 0x3fff0x2acc · 10101011001100
- 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.
GSTOCK / WETH
fee dynamic, now 3%- Swap GSTOCK → WETHno liquidity below the price
- Swap WETH → GSTOCKhook takes 1.00%
- Add, then remove liquiditydeposit refused: LiquidityAddsDisabled
pool 0xf1ac588b4cf0a92d20abe5b23c9e71967b988169520f261da104c6c083b7c13d
WETH / MCLOVE
fee dynamic, now 1%- Swap WETH → MCLOVEhook takes 1.00%
- Swap MCLOVE → WETHhook takes 1.00%
- Add, then remove liquiditydeposit refused: LiquidityAddsDisabled
pool 0x24e24d936d4acaeb27ed5ef6d28bd18ccfe19210d716f456320db9b3cc9443f3
Read from the bytecode
- Code size
- 11,535 bytes
- Owner
- none found
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 10
- 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.
- 0x015e3c29 initializeMevModule
- 0x01ffc9a7 supportsInterface
- 0x0ca4f9d9 SYSTEM_FEE
- 0x0cd02239 creatorFee
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
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 add liquidity. Can refuse a deposit, or only let some addresses provide liquidity.
- Before remove liquidity. Can refuse a withdrawal. LPs may not get out.
- 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.