WETH / MEDQVLT
fee 0%- Swap WETH → MEDQVLThook takes 4.00%
- Swap MEDQVLT → WETHhook takes 4%
- Add, then remove liquiditycame back whole
pool 0x4cc1306444c7e7564a1c46516ad10040b3d8c6bc9661caf65ad4b41bbb49016e
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 91 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 4% 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() but it has claim.
Not a proxy, no DELEGATECALL, no SELFDESTRUCT.
Each callback refused a call that did not come from the PoolManager.
3 pools over 90 days.
Measured at block 93,327,521. 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 0x4cc1306444c7e7564a1c46516ad10040b3d8c6bc9661caf65ad4b41bbb49016e
pool 0xdd74171908b5023eca858aadb70212905cf20cadec61843316b19085057b1d5d
Selectors found in the dispatcher, named from the public signature database. Red ones are what an owner usually keeps for itself.