WETH / SNOW
fee 0%- Swap WETH → SNOWhook takes 2.00%
- Swap SNOW → WETHrefused: BelowTheCurve
- Add, then remove liquiditycame back whole
pool 0x64a2ae7a2ebe83c9ab316b45dc6e87189430d0a3eb763ffb17233e6c44a751b6
Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
7 pools use this hook, the first one 39 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.
One direction works and the other is refused (BelowTheCurve). You may be able to buy and not sell.
Liquidity added and removed in the same block came back whole.
A fixed fee of 0%, written in the pool key.
No owner and no admin functions found.
Not a proxy, no DELEGATECALL, no SELFDESTRUCT.
Each callback refused a call that did not come from the PoolManager.
7 pools over 38 days.
Measured at block 93,240,263. 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 0x64a2ae7a2ebe83c9ab316b45dc6e87189430d0a3eb763ffb17233e6c44a751b6
pool 0x961e00a36dc9aaca98dd2a7d81bf7da551d457566451028c341c7885a1e338c7
Selectors found in the dispatcher, named from the public signature database. Red ones are what an owner usually keeps for itself.