Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,892,614
0xfe3e…3044
The eight checks
415 pools use this hook, the first one 41 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 swapIt takes 1% on top of the pool fee.
- 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. It stands at 0% now and can change.
- 05caution
No one holds the switchOwned by 0xfc89480E4e79b9249c4a431a58c7e65A52EA97F3. Owner-style functions: transferCreator, setMainBandPosition, setOperator, setFactory, sweep, setMaxInternalPriceImpactBps.
- 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 record415 pools over 41 days.
Measured at block 92,892,614. 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 & 0x3fff0x3044 · 11000001000100
- 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.
ONEPLAY / USDG
fee dynamic, now 0%- Swap ONEPLAY → USDGhook takes 1.00%
- Swap USDG → ONEPLAYhook takes 1%
- Add, then remove liquiditycame back whole
pool 0x4b09733aa281a49a93ce68e026914d428ba21f45bc40f6f6d525f7a0603defde
USDG / VLADCOIN
fee dynamic, now 0%- Swap USDG → VLADCOINhook takes 1%
- Swap VLADCOIN → USDGhook takes 1.00%
- Add, then remove liquiditycame back whole
pool 0xd4e1afff5d3808fad4a26cc7efa83af14be3abd7b51b6e4e3c42803b6a50d915
Read from the bytecode
- Code size
- 24,359 bytes
- Owner
- 0xfc89480E4e79b9249c4a431a58c7e65A52EA97F3
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 14
- 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.
- 0x02ce01fb transferCreator
- 0x1328c45e cancelCreatorTransfer
- 0x21d0ee70 beforeRemoveLiquidity
- 0x249d39e9 BPS
- 0x259982e5 beforeAddLiquidity
- 0x2fdf13ca
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.
- After swap. Runs after every swap.
- After swap returns delta. Can take part of what you get out of every swap.
increaseCardinalityNext
0x2ffdaf89 swapFeeBps0x307ccc36 MAX_PROTOCOL_FEE_SHARE_BPS0x359b4f30 pendingFees0x4216ba24 CREATOR_TRANSFER_EXECUTION_WINDOW0x431a9caa MAX_TOTAL_FEE_BPS0x46ca626b TICK_SPACING0x47473b00 consult0x5001cd15 setMainBandPosition0x558a7297 setOperator0x575e24b4 beforeSwap0x5bb47808 setFactory0x61d027b3 treasury0x61e512f6 pendingCreator0x62545788 creatorClaimed0x62c06767 sweep0x64a1cf43 baseOf0x6739bac7 setMaxInternalPriceImpactBps0x6c2bbe7e afterRemoveLiquidity0x6d70f7ae isOperator0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x791b98bc positionManager0x79ba5097 acceptOwnership0x79dc6ca1 setPeriphery0x7d1a910c setProtocolFeeShareBps0x7f787b27 MAX_SWAP_FEE_BPS0x802ebe86 proposeCreatorTransfer0x82589038 feePolicy0x8da00ae4 setSwapFeeBps0x8da5cb5b owner0x9040f866 protocolFeeShareBps0x90addc1e maxInternalPriceImpactBps0x9177c860 REPOOL_BPS0x91dd7346 unlockCallback0x9b58e0a1 claimable0x9e2a53c9 TWAP_BUY_BPS0x9f063efc afterAddLiquidity0xabe9aa87 twapBuyer0xac7e1e92 poolKeys0xad091230 launches0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xbb5b4d93 registerPool0xbbb30930 CREATOR_TRANSFER_TIMELOCK0xbe378228 PROTOCOL_FEE_BPS0xc16374ef executeCreatorTransfer0xc45a0155 unknown0xc4e833ce getHookPermissions0xc81d0598 baseIsCurrency00xc8eaa792 pendingCreatorTax0xd7b96d4e locker0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe1b4af69 afterDonate0xe30c3978 pendingOwner0xe673df8a operators0xf04a58a8 claimFees0xf11457c7 oracleState