UniswapV4KEMHook

What it can do to your swap

• Can block swapsSwaps are gated (other): only some addresses, or only at some times, can trade through it.
• 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 charge a different fee on each swapThe pool's LP fee is dynamic: the hook sets it, swap by swap.
• Needs data from its own app to swapSwaps through it need extra hook data, so a plain router call reverts.

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

Last test swap

A quote for a tiny exact-in swap each way through ETH / USDG with Uniswap's V4 Quoter, compared with the pool's mid-price minus its 0.00% LP fee. It is an eth_call: nothing is signed or spent. Probed 5 min ago, every hour.

Swaps per day

Volume over the same days: $306.7K, $308.0K, $298.2K, $248.9K, $229.5K, $226.6K, $307.2K. Days end at the snapshot, in UTC.

Pools