Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,242,074
0xD8E8…aafc
The eight checks
5 pools use this hook, the first one 40 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 (PriceOutsideCanonicalRange). 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.
- 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 setFeeSchedule, transferAdmin, setTrustedRouter.
- 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 record5 pools over 39 days.
Measured at block 93,242,074. 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 & 0x3fff0x2afc · 10101011111100
- 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 / CAT
fee dynamic, now 0%- Swap WETH → CAThook takes 1%
- Swap CAT → WETHhook takes 1%
- Add, then remove liquiditydeposit refused: OnlyVaultLiquidity
pool 0xb59f9701a1c62f01a2849c8531d1ded6fb4d085eedf7dccb21eb22b2bf3d19ba
WETH / F656BA
fee dynamic, now 0%- Swap WETH → F656BAhook takes 1%
- Swap F656BA → WETHrefused: PriceOutsideCanonicalRange
- Add, then remove liquiditydeposit refused: OnlyVaultLiquidity
pool 0x6c809dfb0c8ed1dc42e840d2b212397f406fd462073e910268b4edcfde99c279
Read from the bytecode
- Code size
- 11,902 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.
- 0x02669b52 launchpad
- 0x0e18b681 acceptAdmin
- 0x10ddaabc setFeeSchedule
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x26782247 pendingAdmin
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 donate. Runs before a donation to LPs.
- After donate. Runs after 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.
0x2877efed
GATE_PRESET_6H
0x2a1f36ef DEV_BUY_FEE_PIPS0x39d57b02 wired0x4035cc6c MAX_COLLECTION_SIZE0x490b7b9a FEATURE_STAKING0x4d0bf472 GATE_PRESET_1H0x54fdfab9 GATE_PRESET_24H0x575e24b4 beforeSwap0x66b4f0a2 FEATURE_HOLDER_GATE0x687e2c17 trustedRouter0x6c2bbe7e afterRemoveLiquidity0x6d97e46b COIN_SUPPLY0x6fe7e6eb afterInitialize0x75829def transferAdmin0x803be728 presaleBought0x828e3df7 FEATURE_PRESALE_LOCK0x8a73a0ce currentFeePips0x96e9aca3 featureBoundsHash0x9f063efc afterAddLiquidity0xa33ffd92 feeDecaySeconds0xaae49d70 PIPS_DENOMINATOR0xb47b2fb1 afterSwap0xb5217bb4 pools0xb6a8b0fa beforeDonate0xc4e833ce getHookPermissions0xc64f5351 setTrustedRouter0xc8eb9b39 feeEndPips0xd0f3125f MAX_HOOK_FEE_PIPS0xd246637b MAX_DECAY_SECONDS0xd70c5478 feeStartPips0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe470d5cf configure0xe66f4b13 poolFeatures0xf851a440 admin0xfa2b14b0 registerPool0xfbfa77cf vault