ETH / GEY
fee 0.30%- Swap ETH → GEYnothing taken
- Swap GEY → ETHhook adds 0.05%
- Add, then remove liquiditycame back whole
pool 0x4f36c26d63a8490e51bf3623ff89b9cf1db69e6f15d3ebf34e77a6f58bf0bdbd
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 69 d ago.
The address enables before remove liquidity. The hook is allowed to take; the next two checks measure whether it does.
A swap through it pays the pool fee and nothing else.
Liquidity added and removed in the same block came back whole.
A fixed fee of 0.30%, 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.
3 pools over 69 days.
Measured at block 93,430,815. 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 0x4f36c26d63a8490e51bf3623ff89b9cf1db69e6f15d3ebf34e77a6f58bf0bdbd
Selectors found in the dispatcher, named from the public signature database. Red ones are what an owner usually keeps for itself.