Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,950,123
0xd23c…68CC
The eight checks
32 pools use this hook, the first one 97 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 1.00% 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.
- 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 blockBought.
- 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 record32 pools over 96 days.
Measured at block 92,950,123. 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 & 0x3fff0x28cc · 10100011001100
- 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 / JUSTCLICKING
fee 0%- Swap WETH → JUSTCLICKINGhook takes 1.00%
- Swap JUSTCLICKING → WETHno liquidity above the price
- Add, then remove liquiditydeposit refused: LiquidityLocked
pool 0x2d3bae745f8c59264ec8569cd2dbc965075c05f3fdc4c1ddf9261c637dd17b12
WETH / BTURT
fee 0%- Swap WETH → BTURThook takes 1.00%
- Swap BTURT → WETHno liquidity above the price
- Add, then remove liquiditydeposit refused: LiquidityLocked
pool 0x3462df0de4e779282ad123cf1736a56d9b0deba83a99050e27984296d1289792
Read from the bytecode
- Code size
- 10,046 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.
- 0xdc98354e beforeInitialize
- 0xe0b01bac poolState
- 0xe1b4af69 afterDonate
- 0xf29ebf61 feeRouter
- 0xf6487d8c wire
- 0xc45a0155 unknown
- 0xc4e833ce
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 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.
getHookPermissions
0xd5f39488 deployer0xd7b96d4e locker0xdc4c90d3 poolManager0xb2ae8040 GUARD_START_FEE_BPS0xb4002997 MAX_WALLET_BUY0xb47b2fb1 afterSwap0xb5217bb4 pools0xb6a8b0fa beforeDonate0x7fe1d5d8 MAX_BLOCK_BUY0x91dd7346 unlockCallback0x9f063efc afterAddLiquidity0xa4524ee7 walletBought0x69456d58 GUARD_BLOCKS0x6c2bbe7e afterRemoveLiquidity0x6c40af4e GUARD_END_FEE_BPS0x6fe7e6eb afterInitialize0x7853bd61 poolPhase0x4758d414 register0x5208e5c9 graduationQuote0x575e24b4 beforeSwap0x66ab383d flushFees0x259982e5 beforeAddLiquidity0x25d2a3f3 pendingFees0x35ced949 CURVE_FEE_BPS0x4081cae6 blockBought0x45898724 CAP_BLOCKS0x1d8ef3ef currentFeeBps0x21d0ee70 beforeRemoveLiquidity0x249d39e9 BPS0x2522371b GRADUATED_FEE_BPS