While the global stablecoin market is dominated by US dollar assets (USDT, USDC), a heavyweight player in the traditional financial world is attempting to reclaim its voice on the blockchain.
Japan, the economy with the world's third-largest foreign exchange reserve currency (the yen), is launching an ambitious blockchain-based movement with its government and financial giants. The core weapon is the yen stablecoin.This is not just about payments; it's a profound game that could reshape global on-chain capital flows: completely replicating the "yen carry trade," which has dominated the traditional foreign exchange market for decades, onto the blockchain. The Sleeping Giant and Its Web3 Ambitions
Japan is the world's fourth largest economy, with the yen accounting for 5.82% of global foreign exchange reserves, making it the third most systemically important currency after the US dollar and the euro. Its long-standing ultra-low interest rates have made the yen one of the most trusted "financing currencies" for global investors: investors borrow low-cost yen, exchange it for higher-yield currencies for investment, and profit from the interest rate differential.However, in the blockchain economy, this core position of the yen is almost invisible. This situation began to change rapidly after Sanae Takaichi became Prime Minister in 2025 and explicitly set "making Japan a Web3 hub" as a national strategy. One of the core policies is to promote the institutionalization of cryptocurrencies and prioritize stablecoins and security tokens (RWAs). SBI's "National Strategy" is a key executor of this national strategy. Its founder, Yoshitaka Kitao, a legendary figure who co-founded SoftBank's financial business with Masayoshi Son, is transforming SBI into a provider of on-chain financial infrastructure in Japan. SBI's Strium blockchain, developed in collaboration with the Startale Group, targets the institutional market: becoming the settlement layer for tokenized stocks and RWAs. However, a crucial prerequisite for realizing true on-chain stocks (including dividends and voting rights) is a compliant Japanese yen stablecoin for paying on-chain dividends and settlements. This is the strategic significance of the Japanese yen stablecoin. It's not just about fulfilling domestic payments; it's about facilitating a massive global strategy: on-chain yen arbitrage trading. In the traditional world, this process is time-consuming and limited by business hours. On-chain, however, it can theoretically be completed 24/7, almost instantly: investors collateralize assets to borrow yen stablecoins, exchange them for dollar stablecoins, and then invest in DeFi protocols to earn higher returns. This will bring the massive global institutional demand for yen lending into the decentralized finance system. Startale Group has announced the launch of JPYSC, a yen stablecoin specifically designed for this purpose, in the second quarter of 2026. Its founder, Sota Watanabe, revealed that they have contacted several top US financial institutions, which have expressed strong interest in using on-chain yen for arbitrage and swap transactions.
Triple Challenges: Liquidity, Regulation, and Retail Investors
Despite the ambitious blueprint, Japan's path to becoming an on-chain financial center still faces three major obstacles:
Liquidity Dilemma: The existing market capitalization of yen stablecoins (such as JPYC) is only about $20 million, which is insufficient to support large-scale arbitrage trading. Sufficient liquidity is needed, requiring joint issuance of tokens by the three major banks (Mitsubishi UFJ, Mizuho, etc.) or the entry of giants like SBI.
Regulatory Clarity: How stablecoins are measured on bank balance sheets and what capital requirements exist are still under development in the regulatory framework in Japan and globally.
Regulatory Framework Still Under Development: How stablecoins are measured on bank balance sheets and what capital requirements exist are still being refined in Japan and globally.
XingChi
Weatherly
Xu Lin
Jixu
Coinlive 
Cryptoknowmics
Beincrypto
Cointelegraph
Bitcoinist