ERC1967Proxy
RobinhoodRegisteredAn ERC-1967 upgradeable proxy that delegates all Uniswap v4 hook calls to an unverified implementation address. The hook address encodes all 14 permission flags; actual hook behavior cannot be assessed from the proxy-only verified source.
What it can do
Its code executes inside each trade in pools that use it.
It can take or add tokens during a swap. Fees, burns and custom curves work this way, and so do scams.
Pools using it let the hook choose the swap fee instead of a fixed tier.
It runs before liquidity is removed, so it can delay or refuse LP exits.
It can change what LPs get back when they remove liquidity.
It checks every deposit before it goes in.
It can adjust token amounts when liquidity is added.
It runs when a pool is created, often to lock in that pool’s settings.
It runs when someone donates tokens to the pool’s LPs.