Why is Toss testing a Korean won stablecoin?

Toss is testing a Korean won stablecoin to evaluate whether blockchain technology can support compliant payment infrastructure for financial institutions. The three-month pilot will examine settlement, regulatory compliance and transaction privacy.

What technologies are being used in the Toss stablecoin pilot?

The Toss pilot uses Optimism's OP Stack blockchain infrastructure and Sunnyside Labs' Privacy Boost protocol. The proof of concept will test settlement controls, know-your-customer requirements, anti-money laundering compliance and privacy features.

What is the goal of the Toss stablecoin proof of concept?

The proof of concept aims to determine whether a Korean won stablecoin can support institutional payments on a public blockchain while meeting regulatory and operational requirements. Toss said the results could form the basis of a compliant payment infrastructure.

Who is participating in the Toss stablecoin project?

Viva Republica, the operator of Toss, is working with Optimism and Sunnyside Labs on the three-month pilot. Optimism is providing the blockchain infrastructure, while Sunnyside Labs is supplying privacy technology for the project.

How does the Toss pilot compare with other stablecoin initiatives?

The Toss project follows stablecoin payment initiatives by Shinhan Card, Visa and BC Card. These organisations are also exploring blockchain-based payment and settlement systems to assess the commercial use of stablecoins in financial services.

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Toss tests Korean won stablecoin payments

Written by Isaac FrancisPublished Jul 9, 2026, 2:50 AM

Toss has reportedly partnered with Optimism and Sunnyside Labs to test a Korean won stablecoin for institutional payments.
The three-month pilot will assess settlement, compliance and privacy features for blockchain-based payment infrastructure.
The project reflects growing interest among South Korean financial firms in stablecoin-based payment systems.

Viva Republica, operator of Toss, has reportedly partnered with Optimism and Sunnyside Labs to conduct a three-month proof of concept for a Korean won-based stablecoin payment system aimed at financial institutions.

According to Yonhap News, the pilot will use Optimism's OP Stack and Sunnyside Labs' Privacy Boost protocol to evaluate settlement controls, know-your-customer and anti-money laundering compliance, and transaction privacy on a public blockchain.

The proof of concept will assess “whether financial institutions can control the settlement process” while meeting regulatory compliance and privacy requirements, according to the Yonhap News report.

Toss reportedly plans to use the findings from the pilot as the basis for developing a compliant stablecoin payment infrastructure in South Korea, with Optimism providing blockchain infrastructure and Sunnyside Labs supplying privacy technology.

The initiative expands Toss' blockchain payment strategy, and as neither Viva Republica nor Optimism announced a financial impact on a listed company, there was no share price reaction.

Toss, which launched in 2015, said it has more than 30 million users, while South Korean financial institutions have increasingly explored stablecoin payments through pilot programmes.

The project follows stablecoin initiatives involving Shinhan Card, Visa and BC Card as payment providers continue testing blockchain-based settlement systems for commercial use.