Key Takeaways:
South Korea's largest fintech platform is exploring a won-pegged stablecoin built on Optimism's layer-2 infrastructure.
Toss operator Viva Republica signed a memorandum of understanding with Optimism and Sunnyside Labs on July 8 to explore a won-pegged stablecoin, planning a three-month proof of concept using the OP Stack.
"For Web3 technology to be successfully integrated into institutional finance, strict regulatory compliance and strong privacy protection are essential," Kim Kyu-ha, chief business officer at Toss, said.
The PoC will test three core requirements: whether financial institutions can directly control payment and settlement processes, how know-your-customer and anti-money laundering rules can be implemented technically, and how to protect individual transaction data on a public network. The companies will use the OP Stack and Privacy Boost, a privacy technology from Sunnyside Labs that masks transaction details from external parties while allowing financial institutions to review records.
Toss has 30 million registered users and payment infrastructure spanning more than 500,000 merchants. A won-pegged stablecoin could reduce settlement times and transaction costs compared with traditional banking rails, while bringing tens of millions of users onto Optimism's Ethereum layer-2 ecosystem.
What the PoC Will Test
The three-month evaluation will assess whether the OP Stack, Optimism's modular open-source framework for launching custom layer-2 chains, can meet South Korea's institutional financial standards. More than 30 chains operated by global companies and exchanges, including Sony, Uniswap, OKX and Kraken, already run on the OP Stack.
Privacy Boost, developed by Sunnyside Labs, addresses a key barrier to blockchain adoption in finance: the public visibility of transaction histories and balances. The solution conceals critical information from external view while granting financial institutions access to the records they need, matching the privacy standards of traditional finance.
Regulatory and Market Implications
Any stablecoin launched in South Korea must comply with the Electronic Financial Transactions Act and guidelines from the Financial Services Commission. The PoC will test compliance mechanisms including anti-money laundering protocols and real-time auditing capabilities.
Optimism Chief Business Officer Kyle Jenke said the partnership would "demonstrate the performance and privacy standards of the OP Stack tailored to Toss's sophisticated technical requirements."
The initiative positions Optimism as a key infrastructure provider for regulated stablecoins in Asia, a region where blockchain-based settlement remains nascent due to regulatory uncertainty. If successful, the project could serve as a blueprint for other fintech companies exploring regulated stablecoins, potentially driving significant stablecoin volume onto the Optimism ecosystem.
This article is for informational purposes only and does not constitute investment advice.
