Uniswap

USDS

Spark

<a href="https://x.com/sparkdotfi" rel="noopener noreferrer nofollow">@sparkdotfi</a> and <a href="https://x.com/Uniswap" rel="noopener noreferrer nofollow">@Uniswap</a> have joined forces to build what they call a "Stablecoin FX Layer," a shared liquidity network designed to let banks, fintechs, and payment companies move between dollar-pegged tokens without each having to build their own infrastructure from scratch.
<cite>Spark deployed approximately $150 million in stablecoin liquidity across two pools on Uniswap v4 to kick off the first phase, with the pools pairing Sky's USDS with Tether's <a href="https://x.com/search?q=%24USDT&amp;src=cashtag_click" rel="noopener noreferrer nofollow">$USDT</a> and PayPal's PYUSD.</cite><cite>A Spark spokesperson described the deployment as one of the largest automated market maker liquidity migrations in decentralized finance.</cite>
<h2 id="one-shared-system-instead-of-fragmented-pools">One shared system instead of fragmented pools</h2>
<cite>The FX Layer acts as shared liquidity and exchange infrastructure on Uniswap v4, enabling multiple stablecoin issuers to plug into a common system instead of each building and bootstrapping their own liquidity pools, market makers, and inventory management.</cite><cite>Spark acts as the orchestration layer, deciding how liquidity is allocated, governed, and coordinated across different stablecoins.</cite>
<cite>Uniswap and Spark are betting that as the number of stablecoins grows, the market will need the equivalent of a foreign-exchange network to move liquidity between issuers.</cite><cite>The issuer landscape is already expanding rapidly, with PayPal's PYUSD, Ripple's RLUSD, Revolut's planned stablecoin, and banking consortiums in Europe and Japan among the projects in development.</cite>
<cite>The stablecoin market's growth potential frames the urgency: Citi has projected the market could grow from roughly $300 billion currently to $4 trillion by 2030.</cite>
<h2 id="dualpool-hook-to-put-idle-capital-to-work">DualPool hook to put idle capital to work</h2>
<cite>Spark plans to introduce two additional tools in future phases, a Shared Liquidity Layer and a DualPool hook, both built on Uniswap v4's programmable architecture, with a liquidity hook allowing idle capital to be deployed into approved yield strategies when it is not needed for trades.</cite>
<cite>Between swaps, DualPool keeps idle stablecoin liquidity in Spark's yield-bearing ERC-4626 vaults, and moves that capital into a Uniswap v4 pool only when it is needed for execution.</cite><cite>The DualPool hook will go through a separate security review and testing process before release, with the current deployment using standard Uniswap v4 pools rather than this planned framework.</cite>
<cite>The project could eventually expand beyond USDS, USDT, and PYUSD as Spark works with additional stablecoin issuers and ecosystem partners.</cite> Spark CEO Sam MacPherson summed up the thesis plainly: <cite>"It will be defined by the infrastructure that allows hundreds of issuers to operate together at global scale."</cite>
Sources: <a href="https://www.theblock.co/post/406154/spark-uniswap-build-stablecoin-fx-layer-seeded-with-150-million-liquidity-migration" rel="noopener noreferrer nofollow">The Block: Spark, Uniswap build stablecoin FX Layer seeded with $150 million liquidity migration</a> <a href="https://www.coindesk.com/business/2026/06/25/uniswap-spark-aim-to-build-stablecoin-fx-market-as-banks-fintechs-enter-the-industry" rel="noopener noreferrer nofollow">CoinDesk: Uniswap, Spark aim to build stablecoin FX market as banks and fintechs enter the industry</a> <a href="https://thedefiant.io/news/defi/spark-uniswap-sky-150m-usds-uniswap-v4-stablecoin-fx-layer" rel="noopener noreferrer nofollow">The Defiant: Spark, Uniswap, and Sky launch $150M liquidity migration to build shared stablecoin FX layer</a>

Uniswap and Spark are building an FX market for stablecoins

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