South Korea’s most popular financial super-app just took a meaningful step toward putting everyday payments onchain. Optimism, the Ethereum Layer 2 network, signed a memorandum of understanding on July 8 with Viva Republica, the company behind Toss, and Sunnyside Labs, a privacy-focused developer, to explore blockchain-based payment infrastructure for Toss’s massive user base.
The deal kicks off a three-month proof-of-concept that will test a Korean won-pegged stablecoin built on the OP Stack. If it works, it could put onchain rails underneath one of Asia’s most widely used fintech platforms, one that serves up to 30 million users and connects to more than 500,000 merchants.
What the partnership actually involves
The proof-of-concept has three core components. First, the OP Stack will serve as the blockchain backbone, handling transaction throughput and interoperability. Second, a KRW-pegged stablecoin will be tested as the payment medium, though the specific token model hasn’t been disclosed yet. Third, Sunnyside Labs will deploy its Privacy Boost technology to handle KYC and AML compliance.
South Korea’s financial regulatory environment is among the most stringent in Asia. Any stablecoin or crypto payment product that wants to operate at scale there needs to demonstrate institutional-grade compliance from day one. Privacy Boost is designed to let users transact onchain while still satisfying identity verification requirements.
