SBI Moves ¥1 Billion of JPYSC Yen Stablecoin Reserves Into Japanese Government Bonds

Reserve Rules Open the Door for JPYSC

Japan's SBI group has started putting its yen stablecoin reserves to work in the government bond market. SBI Shinsei Trust Bank and SBI VC Trade announced on September 7 that a portion of the trust assets backing JPYSC — the yen-linked stablecoin issued by the trust bank — has begun being deployed into Japanese short-term government bonds, with an initial ¥1 billion of reserves moved into the instrument. The decision follows a regulatory revision that widened the range of permitted reserve assets for trust-type stablecoins in Japan. Under the revised Payment Services Act, which took effect in June 2026, up to 50% of a stablecoin's issued amount may now be held in short-term government bonds or time deposits with maturities of three months or less. Before the change, reserve assets were in principle required to sit in demand deposits such as ordinary bank accounts, earning nothing for the issuer. The two companies framed the move as a liquidity measure rather than a yield play: per their announcement, the aim is to secure the funds needed to honor JPYSC redemptions at any time while managing reserves in yen-denominated assets carrying high creditworthiness. Short-term Japanese government bonds fit that brief precisely, combining deep secondary-market liquidity with an explicit sovereign guarantee. The deployment stands as one of the first concrete uses of the amended law by a Japanese stablecoin issuer, and it signals how quickly the country's stablecoin framework is shifting from a purely custodial model toward one in which reserves actively participate in domestic money markets. For a stablecoin whose entire value proposition rests on the promise of one-to-one redemption in yen, the composition of the reserve portfolio is the single most important credit variable — and SBI's choice to favor the safest liquid instrument available underscores that priority.

Japan's First Trust-Type Yen Stablecoin

JPYSC occupies a distinctive position in Japan's digital currency landscape. It is an electronic payment instrument engineered to track the Japanese yen at a one-to-one ratio, and it holds the distinction of being the country's first trust-type yen stablecoin: SBI Shinsei Trust Bank issues the token, while SBI VC Trade — the group's crypto-asset exchange arm, whose licensed operations span spot and contract trading services — acts as the trust settlor responsible for circulation. The trust structure matters for holders, because assets placed in trust are segregated from the issuer's general balance sheet, adding a protective layer in a stress scenario. Scale is building quickly. As of September 7, 2026, JPYSC's outstanding issuance stood at approximately ¥20.1 billion, with lending applications totaling about ¥6.9 billion, bringing the combined footprint to roughly ¥27 billion. At that size, the ¥1 billion initially routed into government bonds represents only a modest slice of the reserve base — comfortably inside the 50% ceiling the amended law allows — leaving substantial room for the deployment to expand as the group grows comfortable with the new mechanics. The wider SBI ecosystem is also cultivating utility around the token beyond simple payments. In July, SBI Holdings, the group's parent company, announced a strategic partnership with Ondo Finance, a leading firm in real-world asset tokenization. The two companies are studying the use of JPYSC for on-chain settlement and as collateral, aiming to deliver domestic and international investors more versatile financial services. That trajectory ties Japan's regulated stablecoin rail into the tokenization and Bitcoin DeFi infrastructure where Ondo operates, and it points toward cross-chain and omnichain payment use cases that reserves parked idle in demand deposits could never plausibly support. Readers tracking the market in real time can follow live spot and futures prices on MEXC.

Toward the 50% Deployment Cap

The official announcement from SBI Shinsei Trust Bank and SBI VC Trade is the primary record here, and its language is deliberate: liquidity first, credit quality second, yield nowhere mentioned. Our reading is that the signal outweighs the amount. A regulated Japanese issuer routing reserves into sovereign debt establishes exactly the template the amended Payment Services Act was drafted to enable, and with roughly ¥27 billion in combined JPYSC balances, incremental moves toward the 50% cap would channel meaningful, recurring flow into short-term JGBs. Watch whether other trust-type issuers follow — the regulatory door is now demonstrably open.