Spark Stablecoin FX Layer Brings $150M to Uniswap v4

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The first deployment seeds two pools, USDS/PYUSD and USDS/USDT. Spark frames the rollout as shared liquidity infrastructure for stablecoin issuers. According to Uniswap, that liquidity will soon shift into a new v4 hook called DualPool.

Inside Spark’s Stablecoin FX Layer

The Stablecoin FX Layer is Spark’s pitch for how stablecoins should share liquidity. Instead of each issuer building isolated pools, they tap a common pool of capital. USDS acts as the initial quoting asset, with USDT and PYUSD support at launch.

Spark is the lending and liquidity arm of the Sky ecosystem, formerly MakerDAO. Its Spark Liquidity Layer already routes USDS, sUSDS, and USDC across DeFi, centralized venues, and real-world assets. So this migration extends a strategy the team has run for months.

Spark CEO Sam MacPherson framed the goal in broad terms. “The next generation of stablecoins won’t be defined by who can issue another digital dollar,” he told The Block. “It will be defined by the infrastructure that allows hundreds of issuers to operate together at global scale.”

How the DualPool Hook Works

A Uniswap v4 hook is an optional contract attached to a pool at creation. It runs custom logic at key moments, such as before a swap or when liquidity changes. As a result, developers can extend the core exchange without forking it.

Uniswap v4 launched in 2025 with a singleton design and this hook system. That architecture makes custom pool logic cheaper to build and run. DualPool is one of the first hooks aimed squarely at stablecoin market makers.

DualPool targets a familiar stablecoin tradeoff. Capital sitting in a pool earns swap fees only when it is active. Capital in a yield vault earns steady yield but cannot serve instant swaps.

So DualPool keeps most inventory in Spark’s ERC-4626 yield-bearing vaults between trades. When a swap arrives, the hook pulls only the exact capital needed into the pool. Then it settles the trade and returns the funds to the vault in the same block.

For swappers, the experience looks like a normal Uniswap trade with deep liquidity. For liquidity providers and issuers, idle assets keep earning yield. Spark and Uniswap Labs built the hook together, according to the Uniswap announcement.

Where the $150M Came From

The $150 million figure refers to stablecoin liquidity drawn mainly from Spark’s own deployments. Much of it traces back to the Spark Liquidity Layer and its vaults. In short, the capital is moving venues rather than appearing from nowhere.

On-chain data lines up with the headline number. The PYUSD/USDS v4 pool recently held roughly $97 million to $101 million, according to the Uniswap pools explorer. The USDS/USDT pool sat near the $50 million range, which together approaches $150 million.

Still, some details remain unconfirmed. The originating Spark wallet addresses and exact migration transaction hashes had not surfaced in public dashboards at publication. Readers can track the source capital on DefiLlama.

Market Reaction and the SPK Token

The price reaction looked muted in the first hours. SPK, Spark’s governance token, traded near $0.017 with 24-hour volume around $12 million to $14 million, based on CoinGecko data. UNI showed a similarly quiet move.

Analysts read the launch as a narrative-driven story rather than an immediate price catalyst. Because the liquidity is shifting between venues, Spark’s total value locked should show reallocation more than net growth. No major liquidations or open-interest spikes were reported. None of this is financial advice.

Risks and Open Questions for the Stablecoin FX Layer

The DualPool hook is not live yet. Uniswap says it is undergoing audits and will be open-sourced once that work completes. So hook security remains an open watchpoint until the code ships and reviews land.

The framing also invites scrutiny. Calling this one of the largest migrations in DeFi history is marketing language, and larger venue shifts exist. Meanwhile, some experts cited by The Block question whether stablecoin wrappers can match tokenized deposits or central bank digital currencies for real-world redemption.

Long-term control of the hook is another unknown. Spark will own it at first, then hand it to open-source governance later. The exact timeline and the audit firm have not been disclosed.

What Comes Next for Spark and Uniswap

The next milestone is the DualPool hook deployment and the second leg of the migration into hooked pools. After audits, Spark plans to open-source the code. Traders can watch the live v4 stable pools and Spark’s TVL dashboards for the actual shift.

If the model works at scale, it could push other issuers toward shared liquidity rather than siloed pools. For now, the Stablecoin FX Layer is live with $150 million behind it, and the harder test arrives when the hook goes on-chain.