WETH / MRC211
fee 0%- Swap WETH → MRC211hook takes 1%
- Swap MRC211 → WETHhook takes 1%
- Add, then remove liquiditycame back whole
pool 0x243f757ceddcd02a6f765a5a1bcd1b2cbbc15e21ca8af6f9c58b28c8ed07d510
Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
5 pools use this hook, the first one 69 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 1% 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 claimTrader.
Not a proxy, no DELEGATECALL, no SELFDESTRUCT.
Each callback refused a call that did not come from the PoolManager.
5 pools over 68 days.
Measured at block 93,268,711. 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 0x243f757ceddcd02a6f765a5a1bcd1b2cbbc15e21ca8af6f9c58b28c8ed07d510
pool 0x3f6093e6796deb47bef410af9176bc05bbae4e26a2afcaa40763b0b081ecdbc2
Selectors found in the dispatcher, named from the public signature database. Red ones are what an owner usually keeps for itself.