ETH / STAMP
fee 0%- Swap ETH → STAMPhook takes 2.90%
- Swap STAMP → ETHno liquidity above the price
- Add, then remove liquiditycame back whole
pool 0x0b0cc600f2294d4da9698a9f0580925f774ae52f8b9652210a896bd1048cddda
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 8 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 2.90% of each 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.
3 pools over 7 days.
Measured at block 93,457,109. 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 0x0b0cc600f2294d4da9698a9f0580925f774ae52f8b9652210a896bd1048cddda
pool 0xdb54e3dba0ef6c4901b583e11264f597db1eda38377d7c317b6d87861accdfdf
Selectors found in the dispatcher, named from the public signature database. Red ones are what an owner usually keeps for itself.