ETH / NINJACAT
fee 0%- Swap ETH → NINJACATnothing taken
- Swap NINJACAT → ETHhook takes 99%
- Add, then remove liquiditycame back whole
pool 0x873cd33136b07406abfc93a9803ea39b296b1ad0df164fa29a60516d4c05e8fa
Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
8 pools use this hook, the first one 55 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 took 99% of a swap 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.
Owned by 0x1ed216D14fd017050BBB7Cd6C87Ca96F40B030E4. Owner-style functions: setFactory, setTaxRecipient, transferOwnership.
Not a proxy, no DELEGATECALL, no SELFDESTRUCT.
Each callback refused a call that did not come from the PoolManager.
8 pools over 54 days.
Measured at block 93,113,529. 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 0x873cd33136b07406abfc93a9803ea39b296b1ad0df164fa29a60516d4c05e8fa
pool 0x6f815f16c688bd70164a3f9069238b93f53b209040eab13b5cf110af7c4c937f
Selectors found in the dispatcher, named from the public signature database. Red ones are what an owner usually keeps for itself.