Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 93,088,924
0xb2c9…38C4
The eight checks
9 pools use this hook, the first one 74 d ago.
- 01caution
Permissions that touch your moneyThe address enables after swap returns delta. The hook is allowed to take; the next two checks measure whether it does.
- 02pass
What it takes from a swapA swap through it pays the pool fee and nothing else.
- 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 0.30% now and can change.
- 05caution
No one holds the switchNo owner() but it has setLiquidityAllowed, upgradeToAndCall, setPoolCreator, UPGRADE_INTERFACE_VERSION, upgradeAdmin, transferUpgradeAdmin.
- 06fail
The code cannot changeIt is a proxy. The code that runs lives at 0x650d0766302bF3F316bfa747451E665dB880B556.
- 07pass
Only the PoolManager can call itEach callback refused a call that did not come from the PoolManager.
- 08pass
Track record9 pools over 74 days.
Measured at block 93,088,924. 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 & 0x3fff0x38c4 · 11100011000100
- 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.
USDe / USDG
fee dynamic, now 0.30%- Swap USDe → USDGnothing taken
- Swap USDG → USDenothing taken
- Add, then remove liquiditycame back whole
pool 0xddfbd3eeed75504a8f3867d19c5b9435e449c689526690a6745130b3f3906966
Read from the bytecode
- Code size
- 11,985 bytes
- Owner
- none found
- Proxy
- yes, code at 0x650d0766302bF3F316bfa747451E665dB880B556
- DELEGATECALL
- present
- SELFDESTRUCT
- absent
- Outside calls
- 2
- 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.
- 0x0914a603 setLiquidityAllowed
- 0x13f1aa5e MAX_FEE_CEILING
- 0x21d0ee70 beforeRemoveLiquidity
- 0x259982e5 beforeAddLiquidity
- 0x27469f4d liquidityAllowed
- 0x35d6b7cb
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.
- After initialize. Runs once, right after 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.
- After swap returns delta. Can take part of what you get out of every swap.
observations
0x46904840 feeRecipient0x47473b00 consult0x4f1ef286 upgradeToAndCall0x52d1902d proxiableUUID0x52fe3087 CARDINALITY0x54acc3d1 setPoolCreator0x572b6259 lpFeePips0x575e24b4 beforeSwap0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x87e9b639 restrictedLiquidity0x91efb6fa minObservationInterval0x93ed10f0 MAX_HOOK_FEE0x9f063efc afterAddLiquidity0xad3cb1cc UPGRADE_INTERFACE_VERSION0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xc400b1d5 initialize0xc4d5608a upgradeAdmin0xc6c1decd poolCreator0xcaa93ee8 currentFee0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe3fdddbf transferUpgradeAdmin0xe74b981b setFeeRecipient0xee89261b hookFeePips0xf4a9c2db poolStates