HCAT / NVDA
fee 0%- Swap HCAT → NVDAno liquidity below the price
- Swap NVDA → HCAThook takes 2.00%
- Add, then remove liquiditycame back whole
pool 0x073da315b5b9880632ae32a66439bcc8fd4ff3b53f2052671eea33e91ddad552
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 30 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 2.00% 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.
4 pools over 30 days.
Measured at block 93,326,698. 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 0x073da315b5b9880632ae32a66439bcc8fd4ff3b53f2052671eea33e91ddad552
pool 0x43e8413f8221cd58970287087f059ceb51496522e6584b13f07e0437d9514881
Selectors found in the dispatcher, named from the public signature database. Red ones are what an owner usually keeps for itself.