ETH / GNAWTCH
fee 0.50%- Swap ETH → GNAWTCHhook takes 2.50%
- Swap GNAWTCH → ETHhook takes 2.50%
- Add, then remove liquiditycame back whole
pool 0xcfc20c8feef2d46703b6c650b2e186378052cdf1b131882aeaae424e95078a92
Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
3 pools use this hook, the first one 19 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 5.00% of each swap on top of the pool fee.
Liquidity added and removed in the same block came back whole.
A fixed fee of 1%, written in the pool key.
No owner() but it has setGrain.
Not a proxy, no DELEGATECALL, no SELFDESTRUCT.
Each callback refused a call that did not come from the PoolManager.
3 pools over 18 days.
Measured at block 93,419,462. 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 0xcfc20c8feef2d46703b6c650b2e186378052cdf1b131882aeaae424e95078a92
pool 0xb601bc9ef9e72eaea45bc15a3661810670be5e13c9fd758c0e533b9c7092db8a
Selectors found in the dispatcher, named from the public signature database. Red ones are what an owner usually keeps for itself.