ETH / URSV
fee dynamic, now 4%- Swap ETH → URSVnothing taken
- Swap URSV → ETHnothing taken
- Add, then remove liquiditycame back whole
pool 0xd86a491d47fb8572b63410c1bfcf232fa68dd9d4f76e9aca20c9158b7e7aaeb2
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 18 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.
A swap through it pays the pool fee and nothing else.
Liquidity added and removed in the same block came back whole.
Its pools use a dynamic fee that the hook sets before every swap. It stands at 4% now and can change.
No owner() but it has claim, claimFor, claimable.
Not a proxy, no DELEGATECALL, no SELFDESTRUCT.
Each callback refused a call that did not come from the PoolManager.
3 pools over 17 days.
Measured at block 93,420,068. 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 0xd86a491d47fb8572b63410c1bfcf232fa68dd9d4f76e9aca20c9158b7e7aaeb2
pool 0x4be98e5954e05de34fbae93c78c22a5899b51c19db5a202f7bf071432fd49d87
Selectors found in the dispatcher, named from the public signature database. Red ones are what an owner usually keeps for itself.