ERC1967Proxy

What it can do to your swap

• Its code can be replacedThe hook is a proxy (EIP-1967). Whoever controls it can swap in new code, so what it does today is not a promise for tomorrow.
• Can take a fee from your outputAfter the pool fills your swap, the hook can keep part of what you were about to receive.
• Runs code before your swap and can block itThe hook is called before every swap. It can revert, which makes your swap fail.
• Runs code after your swap and can block itThe hook is called after every swap. It can revert, which undoes your swap.
• Can block people from adding liquidityCalled before each deposit into the pool.
• Runs code when a pool is createdCalled once, when someone creates a pool with this hook.
• Runs code after a pool is createdCalled once, right after a pool with this hook is created.
• Can charge a different fee on each swapThe pool's LP fee is dynamic: the hook sets it, swap by swap.

Read from the hook address: flag bits beforeInitialize, afterInitialize, beforeAddLiquidity, beforeSwap, afterSwap, afterSwapReturnsDelta. Flags glossary.

Last test swap

A quote for a tiny exact-in swap each way through USDe / USDG with Uniswap's V4 Quoter, compared with the pool's mid-price minus its 0.30% LP fee. It is an eth_call: nothing is signed or spent. Probed 7 h ago, every hour.

Pools