Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,142,768
0xeCce…aaCC
The eight checks
7 pools use this hook, the first one 15 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.
- 02fail
What it takes from a swapOne direction works and the other is refused (UntrustedRouter). You may be able to buy and not sell.
- 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 switchOwned by 0xf64c46888fe5B2f623BB82CB5822ee6c28EAF21d. Owner-style functions: claim, setLaunchFee, sweepProtocolFees, setLister, setTrustedRouter, claimable.
- 06fail
The code cannot changeIt is a proxy. The code that runs lives at 0x0436919E62e517a45061cD570323043CF72c114d, and 0x56220A67b4D803500A42D6BD6b3F8E93c830Be38 can replace it.
- 07pass
Only the PoolManager can call itEach callback refused a call that did not come from the PoolManager.
- 08pass
Track record7 pools over 14 days.
Measured at block 93,142,768. 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.
ETH / KRYPTOCAT
fee 0%- Swap ETH → KRYPTOCAThook takes 2.30%
- Swap KRYPTOCAT → ETHhook takes 2.30%
- Add, then remove liquiditydeposit refused: PoolIsClosed
pool 0x0c80a8a08fe0bd5dcdd2d8c7fa2d0cb043bed9ce3ce565203158fa054d7ac368
HUNDRED / TKRYP
fee 0%- Swap HUNDRED → TKRYPno liquidity below the price
- Swap TKRYP → HUNDREDrefused: UntrustedRouter
- Add, then remove liquiditydeposit refused: PoolIsClosed
pool 0x1b8f1631f8b123b13ff2f2e19bc174a2c647872be67201414998a8c01647f26b
Read from the bytecode
- Code size
- 24,452 bytes
- Owner
- 0xf64c46888fe5B2f623BB82CB5822ee6c28EAF21d
- Proxy
- yes, code at 0x0436919E62e517a45061cD570323043CF72c114d
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 23
- 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.
- 0x03fd2a45 DEAD
- 0x0f6313e6 launchedAt
- 0x12b869fe unknown
- 0x13560cac allCoins
- 0x1428f21b royaltiesOf
- 0x1b86bf5a MAX_COIN_FEE_BPS
- 0x1e83409a claim
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.