Doppler

What it can do to your swap

• 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 after your swap and can block itThe hook is called after every swap. It can revert, which undoes your swap.
• Runs code after liquidity is addedCalled after each deposit into the pool.
• Runs code after liquidity is removedCalled after each withdrawal.
• Runs code when a pool is createdCalled once, when someone creates a pool with this hook.
• 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, afterAddLiquidity, afterRemoveLiquidity, afterSwap, afterSwapReturnsDelta. Flags glossary.

Last test swap

A quote for a tiny exact-in swap each way through NMS / QQQ with Uniswap's V4 Quoter, compared with the pool's mid-price minus its 0.20% LP fee. It is an eth_call: nothing is signed or spent. Probed 64 min ago, every hour.

Swaps per day

Volume over the same days: $2.34M, $2.49M, $2.10M, $2.12M, $3.24M, $2.15M, $3.19M. Days end at the snapshot, in UTC.

Pools, 24 of 221,146