WETH / RSW18
fee dynamic, now 0%- Swap WETH → RSW18hook takes 1.70%
- Swap RSW18 → WETHhook takes 1.70%
- Add, then remove liquiditycame back whole
pool 0xcf851cf848a8213de6969704617350fa784d5cae2c4e10e04703cfdcb7da17db
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 53 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 1.70% of each swap on top of the pool fee.
Liquidity added and removed in the same block came back whole.
Its pools use a dynamic fee that the hook sets before every swap. It stands at 0% now and can change.
No owner() but it has setLaunchWhitelist.
Not a proxy, no DELEGATECALL, no SELFDESTRUCT.
Each callback refused a call that did not come from the PoolManager.
18 pools over 53 days.
Measured at block 92,972,620. 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 0xcf851cf848a8213de6969704617350fa784d5cae2c4e10e04703cfdcb7da17db
pool 0x02d915e60919bd2074594434ef0fa8d9c09d5e1a3756939e4bbf8347b549851c
Selectors found in the dispatcher, named from the public signature database. Red ones are what an owner usually keeps for itself.