Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,975,366
0xdeCE…20CC
The eight checks
22 pools use this hook, the first one 31 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.
- 02caution
What it takes from a swapIt takes 3.00% of each swap on top of the pool fee.
- 03pass
LPs can get outLiquidity added and removed in the same block came back whole.
- 04pass
The fee is the feeA fixed fee of 0%, written in the pool key.
- 05caution
No one holds the switchOwned by 0x988Cb1A24C759A3C2Faa40fEAd1b36908ee06317. Owner-style functions: claim, setTrustedRouter, setFactory, claimable, setCreatorFeeRecipient, transferOwnership.
- 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 record22 pools over 31 days.
Measured at block 92,975,366. 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 & 0x3fff0x20cc · 10000011001100
- 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 / RIVO
fee 0%- Swap ETH → RIVOhook takes 3.00%
- Swap RIVO → ETHno liquidity above the price
- Add, then remove liquiditycame back whole
pool 0x1460d528ad5cd2263d8979b1f4ae7a6f9036b95193907e0f982219feb449f1cc
Read from the bytecode
- Code size
- 9,384 bytes
- Owner
- 0x988Cb1A24C759A3C2Faa40fEAd1b36908ee06317
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 4
- 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.
- 0x1e83409a claim
- 0x21d0ee70 beforeRemoveLiquidity
- 0x249d39e9 BPS
- 0x259982e5 beforeAddLiquidity
- 0x2975067d MAX_CREATOR_TAX_BPS
- 0x4409c4b9 unknown
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 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.
0x4670a820
unknown
0x4e0f5cc8 setTrustedRouter0x575e24b4 beforeSwap0x5bb47808 setFactory0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x715018a6 renounceOwnership0x79ba5097 acceptOwnership0x8da10869 SNIPE_WINDOW_SECONDS0x8da5cb5b owner0x91dd7346 unlockCallback0x9acda3bb trustedRouter0x9f063efc afterAddLiquidity0xa26c3c45 snipeTaxExempt0xa90783d7 unknown0xaa86bb6b trustedQuoter0xad091230 launches0xb47b2fb1 afterSwap0xb6a8b0fa beforeDonate0xbe378228 PROTOCOL_FEE_BPS0xc45a0155 unknown0xc4e833ce getHookPermissions0xd4570c1c claimable0xd7a41f92 currentSnipeTaxBps0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xe001d0e3 MAX_EXTRA_EXEMPTIONS0xe1b4af69 afterDonate0xe30c3978 pendingOwner0xed8ef7a3 setCreatorFeeRecipient0xf2fde38b transferOwnership