Tokyo Eyes Bank-Issued Yen Stablecoin as Astar's Watanabe Targets JPYSC Launch

HONG KONG — Japan is moving to fold tokenised settlement into the regulated banking perimeter, a shift with material consequences for capital flows across the Asia-Pacific dollar bloc. Sota Watanabe, founder of the Tokyo-based public chain Astar Network (ASTR), said on X this week that he intends to ship "JPYSC" — what he describes as the first bank-issued yen stablecoin — within the next several months.

The framing matters. JPYSC would not be the work of a private issuer holding commercial paper and Treasury bills, the model that built USDT and USDC into roughly $200 billion of offshore dollar liquidity. It would instead sit inside the perimeter that the Financial Services Agency drew when Japan's amended Payment Services Act took effect in June 2023, which forces stablecoin issuers to be licensed and to fully back tokens with redeemable fiat. In practical terms, a Japanese bank would be on the hook for the yen liability, with the Astar rails carrying the messaging.

For the region, that closes a long-standing gap. Singapore has pushed Project Guardian, Hong Kong has spun up an HKD stablecoin sandbox under the HKMA, and South Korea has watched BDACS and Aptos prepare KRW1 for production. Tokyo, by contrast, has spent the post-Mt. Gox decade running the most cautious large-economy crypto regime in Asia. A bank-issued tokenised yen would put Japan in the middle of the conversation rather than at its edge.

The capital-flow angle is where Hong Kong desks are paying attention. A yen stablecoin clearable on-chain gives Japanese corporates a cheaper rail for intra-Asia trade settlement, particularly for the supply-chain corridors running through Vietnam, Thailand and the Philippines that already price in yen. It also offers a yen-denominated collateral asset for the DeFi venues that have been almost entirely dollar-denominated since 2020 — a potential alternative for Asia-Pacific treasurers running carry trades against USDT.

Watanabe has not named the issuing bank, and the timeline remains soft. Regulatory sign-off from the FSA is not a formality, particularly on reserve segregation and redemption mechanics. The Bank of Japan's own digital-yen pilots, now several years in, add a separate competitive vector: if Tokyo eventually deploys a retail CBDC, a private bank-issued token sits in an awkward neighbouring lane.

Still, the strategic read is clear enough. Japan's megabanks have watched USDT volumes on Asian crypto exchanges balloon while yen-denominated on-chain activity has stayed marginal. A regulated, bank-balance-sheet yen token would be a defensive move as much as an offensive one — a way to keep yen settlement inside Japanese institutions rather than ceding it to offshore dollar tokens.

Whether JPYSC ships on Watanabe's stated timeline is the question traders are weighing this week. The direction of travel, however, is no longer in doubt.