ETH / NIBBL
fee 0%- Swap ETH → NIBBLhook takes 5.00%
- Swap NIBBL → ETHhook takes 7.07%
- Add, then remove liquiditycame back whole
pool 0x0a9a36f03093b46981cc5d2830538117f9a1e2665d033ebb3eb50b985cdc7568
Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
4 pools use this hook, the first one 56 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 12.86% 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.
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.
4 pools over 56 days.
Measured at block 93,269,587. 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 0x0a9a36f03093b46981cc5d2830538117f9a1e2665d033ebb3eb50b985cdc7568
pool 0x0449d3fb4cc4fec5ca347a4dfbc36ae5fb2322c07e971b028f8dc3ba371d29d8
Selectors found in the dispatcher, named from the public signature database. Red ones are what an owner usually keeps for itself.