Uniswap DualPool Hook Launches, Audited and Open-Source

Uniswap Labs built the DualPool hook with Spark Finance. The two teams designed it to put idle capital to work. A livestream with Uniswap founder Hayden Adams is set for 2PM ET today.

What the DualPool Hook Does

In a standard pool, LP capital sits idle most of the time. It earns fees only when a swap trades through its price range. So a lot of capital does nothing for long stretches.

DualPool changes that. Idle liquidity parks in yield-bearing ERC-4626 vaults managed by Spark. As a result, the same capital can earn vault yield and swap fees together.

That dual return is the whole pitch. LPs no longer pick between trading fees and lending yield. Instead, the hook chases both at once.

Uniswap put it plainly. “Any team can now deploy their own DualPool hook, allowing them to earn on both active and idle assets,” the company wrote on X.

How the DualPool Hook Works

The hook uses Uniswap v4’s callback system. It reacts around each swap through before-swap and after-swap logic.

Here is the flow. First, a deployer parks assets in an ERC-4626 vault. Then a swap arrives at the pool.

The hook withdraws only the exact amount that swap needs. Next, it deploys that amount as concentrated liquidity inside the v4 pool. The pool then runs a normal swap.

After the trade, the hook pulls the unused liquidity back out. Finally, it redeposits the leftover assets plus fees into the vault. All of this happens in the same block.

Between swaps, the pool holds close to zero resident liquidity. Still, swappers see a normal Uniswap experience. According to Uniswap, funds return to the vault in the same block every time.

How DualPool Differs From Normal JIT Liquidity

Just-in-time liquidity is not new on Uniswap. Searchers already add liquidity right before a big swap and pull it right after. Yet those setups often use fixed ranges and idle stablecoins.

DualPool pushes the idea further. It parks the idle side in a yield vault instead of a wallet. So the capital keeps earning between swaps, not only during them.

It also adds flexibility on top. Curators set custom ranges per pool, rather than one fixed band. In short, DualPool blends JIT execution with continuous vault yield.

Custom Ranges and Curation

LPs and curators set their own price ranges per deployment. That gives more control than fixed just-in-time examples.

The hook also supports two modes. In single-LP mode, the hook blocks outside deposits. In pooled mode, many depositors share curated ranges and vaults.

The $150M Spark Migration

The release builds on an earlier move. On June 25, Spark shifted about $150 million of stablecoin liquidity to Uniswap v4, according to Uniswap.

That liquidity seeded standard v4 pools first. The pairs were USDS/USDT and USDS/PYUSD on Ethereum mainnet. Here USDS acts as the main quoting asset.

Spark leads the Sky ecosystem, the network behind the USDS stablecoin. Its Stablecoin FX Layer aims to make on-chain stablecoin swaps deep and cheap. This migration formed Phase 1 of that plan.

The liquidity should transition to DualPool over time. For now, it still sits in standard pools. So the dual-yield design is not yet live on that $150 million.

Audit and Open-Source Release

OpenZeppelin audited the DualPool hook between May and June 2026. The review found no critical or high-severity issues, according to the docs.

The team also resolved every medium-severity finding, the summary states. Uniswap then open-sourced the code.

So any team can now deploy its own version. The developer docs include an overview and setup guides.

The Risks Behind the DualPool Hook

New hooks add new risk. A hook is extra code between the swapper and the pool. As a result, it widens the attack surface.

DualPool also leans on ERC-4626 vaults. If a vault fails or loses value, that risk flows back to LPs. Settlement and reentrancy logic add more complexity than a plain pool.

There is a centralization angle too. Spark owns and controls the first deployment. Curated pools also hand the curator meaningful control.

The audit reported a clean result. Still, users should treat any new DeFi primitive with care. This article is not financial advice.

What Comes Next

The livestream should add detail. Hayden Adams and Spark contributor @hexonaut plan to discuss the hook, the migration, and the FX Layer at 2PM ET.

Neither UNI nor SPK saw a sharp price move right after the release. That fits a builder-focused launch. So adoption, not price, will be the near-term signal.

Deployment specifics should land on the Uniswap docs. The deployments page will list contract addresses as pools go live.

For now, the DualPool hook gives LPs a new way to stack yield. Whether the full $150 million moves over will show how much the design earns trust.