Japan bond stress raises global risks; analyst cites XRP

Japan’s 30-year government bond topped 4% in May 2026, reaching about 4.2%, and the 10-year yield is near levels last seen in the late 1990s. Japanese investors sold $29.6 billion of U.S. Treasuries in the first quarter of 2026, the largest quarterly outflow since 2022.

The strain followed rate increases by the Bank of Japan that ended decades of ultra-low borrowing costs and unwound the yen carry trade, where investors borrowed cheap yen to buy higher-yielding assets abroad.

Analyst Catalina Castro warned on X that large-scale repatriation of foreign assets could push U.S. yields higher and raise borrowing costs across mortgages and other credit markets. She wrote: “Domino effect: Japan sells American bonds -> American yields RISE further -> mortgages rise -> credit becomes more expensive -> pressure on the ENTIRE American financial system.” The 30-year U.S. Treasury reached about 5% in the same week.

A separate concern is the volume of funds held in nostro and vostro accounts, the prefunded foreign currency balances banks use to settle cross-border payments. Industry estimates place those parked balances between $27 trillion and $37 trillion globally. Because the funds are set aside to meet settlement needs, they do not flow into loans, investment or sovereign bond purchases.

Castro proposed that blockchain-based settlement tools could reduce the need for large prefunded accounts and allow some of those balances to be redeployed. She highlighted Ripple’s On-Demand Liquidity, which uses the digital token XRP as an interim bridge asset to convert one fiat currency to another in seconds.

Pilot programs by Ripple and other providers reported settlement times measured in minutes rather than days and cited cost savings in pilots ranging from about 40% to 70% compared with traditional correspondent banking networks.

Regulatory clarity for token-based settlement tools varies across jurisdictions. Financial institutions have raised concerns about compliance, custody and operational risk, and legal and institutional frameworks would need to be developed before these systems could scale to large volumes.

Market participants are watching the Bank of Japan’s next policy decisions and the pace of capital flows. Faster yield increases in Japan or larger repatriation of foreign assets could add volatility to global bond markets, affect currency movements and raise borrowing costs across economies. Policymakers and market operators are also weighing options to modernize cross-border payment infrastructure.