LOOP / WETH
fee 0.80%- Swap LOOP → WETHno liquidity below the price
- Swap WETH → LOOPhook takes 0.20%
- Add, then remove liquiditycame back whole
pool 0x78053831cd902355bd497b97d244a6b33a33bb4c73c03e3a0b171626b2fb9eaf
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 72 d ago.
The address enables after swap returns delta. The hook is allowed to take; the next two checks measure whether it does.
It takes 0.20% on top of the pool fee.
Liquidity added and removed in the same block came back whole.
A fixed fee of 0.85%, written in the pool key.
No owner() but it has setFactory.
Not a proxy, no DELEGATECALL, no SELFDESTRUCT.
Each callback refused a call that did not come from the PoolManager.
4 pools over 71 days.
Measured at block 93,270,386. 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 0x78053831cd902355bd497b97d244a6b33a33bb4c73c03e3a0b171626b2fb9eaf
pool 0xb7db649df1c2d635fbc0163949c1efadd8323545dc787328f97f042710caa097
Selectors found in the dispatcher, named from the public signature database. Red ones are what an owner usually keeps for itself.