ETH / $DIFF
fee 0%- Swap ETH → $DIFFhook takes 1.00%
- Swap $DIFF → ETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0x97bf96fd7f3b720e9fc09339054861ae4cbf4ad9e4a208b6b885720dbcc60f21
Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
18 pools use this hook, the first one 29 d ago.
The address enables before swap returns delta, after swap returns delta. The hook is allowed to take; the next two checks measure whether it does.
It takes 1% on top of the pool fee.
Liquidity added and removed in the same block came back whole.
A fixed fee of 0%, written in the pool key.
No owner() but it has claimCreatorFees.
Not a proxy, no DELEGATECALL, no SELFDESTRUCT.
Each callback refused a call that did not come from the PoolManager.
18 pools over 28 days.
Measured at block 92,973,521. A hook with an owner or a dynamic fee can behave differently later; scan again before a large trade.
A v4 hook's permissions are the last fourteen bits of its address. The PoolManager calls only what they switch on.
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.
pool 0x97bf96fd7f3b720e9fc09339054861ae4cbf4ad9e4a208b6b885720dbcc60f21
pool 0x58f6a5d041401cadeb808230547849944fa75655aea831741f9ad9455c4bce93
Selectors found in the dispatcher, named from the public signature database. Red ones are what an owner usually keeps for itself.