Spark, the DeFi infrastructure arm associated with the Sky ecosystem, has initiated the migration of approximately $150 million in liquidity into Uniswap v4 pools. The move, announced on Tuesday, marks the first phase of a broader collaboration between Spark, Sky, and Uniswap to establish a shared “Stablecoin FX Layer” on Ethereum.
The initial deployment focuses on two primary liquidity pairs: USDS/USDT and USDS/PYUSD. According to an official blog post from Spark, this migration represents one of the largest automated market maker (AMM) liquidity transfers completed in the decentralized finance sector to date.
• Spark, Uniswap, and Sky are building shared stablecoin FX infrastructure — $150M of USDS liquidity migrating into Uniswap v4 pools, starting with USDS/USDT and USDS/PYUSD
• DualPool mechanism routes idle liquidity into yield-bearing products when not being used for swaps —… pic.twitter.com/X6kbGh5vvy
— Edge Capital Group (@EdgeCapitalMgmt) July 1, 2026
Addressing Liquidity Fragmentation
The move is designed to position Sky’s USDS stablecoin as a central liquidity rail for other stablecoin issuers. By concentrating capital into coordinated Uniswap v4 pools, the participating protocols aim to mitigate the “fragmentation trap” where liquidity is often spread thin across multiple disconnected venues, leading to slippage and inefficient capital usage.
The framework is built to allow future stablecoin issuers to tap into this shared infrastructure rather than establishing independent pools and market-making strategies from scratch. The partnership aims to use USDS as the “common rail” to facilitate smoother swaps between various dollar-pegged assets.
Advanced Features: Hooks and DualPools
The technical implementation leverages the new architecture of Uniswap v4, specifically through the use of “hooks”—programmable extensions that allow developers to customize pool behavior. Spark noted that subsequent phases of this rollout will introduce a “DualPool” mechanism.
This DualPool hook is intended to automate liquidity management by routing idle capital into yield-bearing products when it is not actively being used for swaps. This design seeks to preserve local liquidity for trading while maximizing the capital efficiency of the assets held within the pools.
Market Context and Strategy
The migration comes at a time of shifting capital flows within the stablecoin and lending sectors. While major protocols continue to refine their infrastructure, recent months have seen significant rotations; for instance, Ethena’s sUSDe recently saw capital outflows as yields compressed, with liquidity moving toward protocols like Sky and Aave.
Spark stated that the execution of the broader Shared Liquidity Layer remains subject to further security reviews and testing. The current $150 million deployment is active, establishing the foundation for what the projects describe as a programmable, multi-issuer liquidity system. Future updates are expected to detail the onboarding process for additional stablecoin partners into the shared FX layer.