ETH / TYGR
fee 0%- Swap ETH → TYGRhook takes 5.00%
- Swap TYGR → ETHhook takes 3.00%
- Add, then remove liquiditycame back whole
pool 0x0021842acfbee4b237514f4ed0f00a454116e0b2350b07f65d3e33206ea17811
Reading the hook.
The address, the bytecode, then a swap each way through its pool. A few seconds.
112 pools use this hook, the first one 70 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 took 20.43% of a 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 claimMany, claim, setLauncher.
Not a proxy, no DELEGATECALL, no SELFDESTRUCT.
Each callback refused a call that did not come from the PoolManager.
112 pools over 70 days.
Measured at block 92,890,079. 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 0x0021842acfbee4b237514f4ed0f00a454116e0b2350b07f65d3e33206ea17811
pool 0xa165326d02917904d0e5fa210069d144bb294feac406ff162aa0fa0952e8c115
Selectors found in the dispatcher, named from the public signature database. Red ones are what an owner usually keeps for itself.