Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
v4 hook · Robinhood Chain · block 92,975,427
0xdf01…6ACc
The eight checks
20 pools use this hook, the first one 35 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.
- 02caution
What it takes from a swapIt takes 3.00% of each swap on top of the pool fee.
- 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 0xe09915ce71F6EFc7fC7554303868259f5Dc25d9d. Owner-style functions: claimProtocolFees, 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 record20 pools over 35 days.
Measured at block 92,975,427. 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 / OZCOIN
fee 0%- Swap ETH → OZCOINhook takes 3.00%
- Swap OZCOIN → ETHhook takes 2.96%
- Add, then remove liquiditydeposit refused: NotAuthorized
pool 0x7caf400d886119f0a53c64c398b77b85ce74312f252c4a71f70bd6f335a0d456
Read from the bytecode
- Code size
- 8,127 bytes
- Owner
- 0xe09915ce71F6EFc7fC7554303868259f5Dc25d9d
- Proxy
- no
- DELEGATECALL
- absent
- SELFDESTRUCT
- absent
- Outside calls
- 5
- 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.
- 0x03fc2013 lpLocker
- 0x21d0ee70 beforeRemoveLiquidity
- 0x249d39e9 BPS
- 0x259982e5 beforeAddLiquidity
- 0x32574bbf unknown
- 0x3b586129 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 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.
0x49d0c431
previewBuyFees
0x575e24b4 beforeSwap0x687e2c17 trustedRouter0x6c2bbe7e afterRemoveLiquidity0x6fe7e6eb afterInitialize0x7195270a quoteOf0x757a585c _rejectRelease0x77c654a3 claimProtocolFees0x79ba5097 acceptOwnership0x7b103999 registry0x85b0609a unknown0x8da5cb5b owner0x91dd7346 unlockCallback0x921dbe1c unknown0x9f063efc afterAddLiquidity0xb47b2fb1 afterSwap0xb5217bb4 pools0xb6a8b0fa beforeDonate0xbe378228 PROTOCOL_FEE_BPS0xc45a0155 unknown0xc4e833ce getHookPermissions0xc64f5351 setTrustedRouter0xcedd3a0e isLive0xdc4c90d3 poolManager0xdc98354e beforeInitialize0xdcf844a7 protocolFees0xe1b4af69 afterDonate0xe2fdcc17 escrow0xe30c3978 pendingOwner