Japan Megabanks Eye Joint Stablecoin as ETFs Shed $1.72B, AI Stokes DeFi Risk

Crypto News

Japan's three largest lenders, MUFG, Sumitomo Mitsui Banking Corporation and Mizuho, are preparing to issue a joint stablecoin during the 2026 fiscal year, marking one of the most significant institutional moves toward blockchain-based payments in the region. The banks will form a dedicated working group to evaluate business use cases, operational structure and a commercialization strategy. Having run regulator-backed pilot tests since November 2025 with support from the Financial Services Agency, the trio is now shifting from experimentation toward commercial readiness. The stated goal is to embed stablecoins into mainstream financial settlement rather than confining them to crypto trading, signaling deepening corporate adoption of digital payment rails.

Anthropic publicly released Fable 5, the first openly available model in its Claude Mythos family, prompting renewed security concerns across the DeFi community. The company said the model carries safeguards that redirect sensitive cybersecurity requests, after disclosing last month that a Mythos model identified more than 10,000 high or critical vulnerabilities in systemically important software. Moonrock Capital founder Simon Dedic warned that the cost of finding exploitable smart-contract flaws could fall toward zero, urging users to revoke wallet permissions and move assets to fresh cold wallets. Crypto stolen through attacks reached $629.7 million in April, the highest level since February 2025.

Curve Finance co-founder Michael Egorov offered a counterweight to the alarm, arguing that an AI model's success at finding bugs in conventional software may not translate directly to decentralized finance code. In his assessment, the larger threat sits in operational security and front-end supply-chain compromise rather than in audited on-chain logic itself. The debate underscores a widening split among developers over how advanced language models reshape the attack surface for protocols. Smaller projects with weak audit histories and forked codebases reusing known vulnerabilities are viewed as the most exposed, while battle-tested contracts may prove more resilient than the early warnings suggest.

Robinhood Securities said it secured approval to act as an IPO underwriter, moving from a distribution role into the main underwriting syndicate alongside Wall Street banks. Chief executive Vlad Tenev framed the step as the natural progression after launching IPO Access in 2021, noting the industry question has shifted from whether to allocate shares to retail toward how large that allocation can be. The timing is notable: SpaceX is reportedly weighing offering up to 30% of its record-setting issuance to retail investors, with demand already running near four times the planned size, intensifying competition for direct access to marquee listings.

Crypto-native venues are racing to build parallel rails around the same private-market listings. Major exchanges now offer tokenized pre-IPO products, while on-chain pre-IPO perpetual contracts are emerging as a genuine price-discovery venue. SpaceX contracts on one decentralized derivatives platform have generated billions in volume and hundreds of millions in open interest, with liquidity drawn from retail traders, crypto-native funds and systematic market makers. In one prior case, pre-IPO futures tracked a stock's eventual opening level within roughly 1%, far closer than the underwriters' pricing. Underwriters are increasingly likely to monitor these signals as a supplementary demand gauge, though not a replacement for traditional book-building.

CoinShares research head James Butterfill characterized recent digital-asset outflows as a sentiment shock rather than a structural break, pointing to geopolitics, shifting rate expectations and capital rotation into artificial intelligence. US spot Bitcoin ETFs recorded about $1.72 billion in net outflows last week, deepening the prevailing bear market mood. Separately, Strategy's BTC Yield slipped from 13.0% to 12.8% after the firm bought an additional 1,550 BTC, lifting holdings to 845,256 BTC and igniting a public dispute between Michael Saylor and critics over whether the latest raise was dilutive on a bitcoin-per-share basis.

Taken together, these developments trace a single arc: institutions are advancing crypto infrastructure even as risk appetite collapses. COINOTAG's aggregate market data captures the strain, with the Fear and Greed Index at 9 of 100, firmly in Extreme Fear, and total crypto market capitalization at roughly $1.78 trillion. Bitcoin dominance stands at 70.2%, reflecting a defensive rotation out of altcoins as capital concentrates in the largest asset. The contrast is striking: megabank stablecoin plans, expanding pre-IPO rails and corporate treasury accumulation point to long-horizon conviction, while $1.72 billion in weekly ETF redemptions and the heightened AI-driven exploit threat reveal how fragile near-term confidence remains.