Japan's three megabanks—MUFG, Sumitomo Mitsui, and Mizuho—plan to jointly issue fiat-backed stablecoins in fiscal 2026, advancing commercial rollout after pilot tests with the Financial Services Agency that began in November 2025. Hong Kong granted stablecoin issuer licenses to two institutions in April, with the government stating that regulated stablecoins are expected to launch as early as mid-year 2026 under a framework that imposes stringent criteria covering application scenarios, business sustainability, and risk management. Meanwhile, the United States Treasury Department has published no comparability determination criteria for foreign stablecoin issuers in the approximately 11 months since the GENIUS Act was enacted, despite a statutory deadline of July 18, 2026—now 76 days away—that covers only domestic implementing regulations.
The operational contrast is sharp. Japan's three megabanks are not waiting for coordination. They have established a dedicated consultation body to study operational models and practical application plans, moving forward "in line with regulatory requirements and market developments" under a framework that has been tested with the FSA since late 2025. Hong Kong's regime is equally concrete: the Hong Kong Monetary Authority received 36 applications in the first phase, granted two licenses in April, and stated that the total number of licenses "will remain limited even if more are issued in the future." The HKMA's licensing criteria are public, covering everything from application scenarios to compliance performance.
Both jurisdictions have finalized their frameworks through actual implementation—pilot programs in Japan, live licensing processes in Hong Kong—establishing technical standards and approval pathways that issuers can build against.
Treasury's comparability determination architecture, by contrast, remains entirely unpublished. The GENIUS Act requires the Treasury Secretary to determine whether a foreign jurisdiction's regulatory regime is "comparable" to the federal framework before any foreign issuer can register with the Office of the Comptroller of the Currency to serve U.S. customers. That determination is the gate. Without it, no foreign issuer—regardless of how robust its home-country supervision—can access U.S. markets under the federal stablecoin framework. Treasury published an advance notice of proposed rulemaking in September 2025 soliciting comment on GENIUS Act implementation questions. That ANPRM received 403 comment letters.
Treasury then published a notice of proposed rulemaking on April 3, 2026, addressing only state-level similarity criteria—the principles for determining when a state regime is "substantially similar" to the federal framework. The comment period for that NPRM closed June 2, 2026. No notice of proposed rulemaking on foreign-issuer comparability criteria has been published. No timeline for such a rule has been announced. No foreign jurisdiction has received a comparability determination.
The statutory clock is running. The GENIUS Act, enacted July 18, 2025, mandates that Treasury and the primary federal banking regulators—the Federal Reserve, FDIC, NCUA, and OCC—issue all implementing regulations by July 18, 2026. That deadline is 76 days away. Six federal agencies are simultaneously drafting final rules after all major comment periods closed as of June 9, 2026. The OCC proposed its federal stablecoin issuer licensing rule in March with a comment period that closed May 1. The FDIC published proposed rules in April with comments closing June 2 through 9. Treasury issued its state-similarity principles on the same timeline. FinCEN and OFAC published AML-focused rules with comment periods through June 9. The NCUA followed with credit union-specific proposals. All major comment periods are now closed. The agencies have five weeks to finalize the domestic architecture.
But the July 18 deadline applies only to domestic rules. The statute provides no separate deadline for foreign-issuer comparability criteria. Treasury has discretion over timing, process, and substance. That discretion creates the structural asymmetry: Asian jurisdictions are establishing operational approval processes through concrete implementation while U.S. foreign-issuer criteria remain undefined, forcing issuers into a binary choice between proceeding with regional frameworks that may conflict with eventual U.S. requirements or indefinitely delaying market access to await criteria that have no publication timeline.
The decision points are immediate. Japan's fiscal 2026 runs from April 2026 through March 2027. If the three megabanks proceed with joint issuance on that timeline, they will launch under Japan's Payment Services Act framework as amended and operationalized through FSA pilot testing. Hong Kong's two licensed issuers are planning mid-year 2026 launches based on business plans submitted to the HKMA. Both groups face the same question: do we design our technical architecture, reserve composition, redemption mechanics, and compliance controls to meet the home-country framework we know, or do we wait for Treasury to publish criteria that may impose conflicting requirements—criteria that have no publication date and no guarantee of alignment with frameworks we have already built against?
The reserve composition question illustrates the tension. Japan's Payment Services Act amendments, which took operational effect in early June 2026, introduced a formal classification framework for stablecoins as "electronic payment instruments" with detailed reserve, custody, and redemption requirements codified in Cabinet orders and FSA ordinances. The FSA's May 2026 publication on partial amendments to the designation of equivalent-regulation countries reflects the latest iteration of those rules. Hong Kong's framework imposes its own reserve and risk-management criteria as conditions of licensing. Treasury's comparability determination will require that a foreign regime meet or exceed GENIUS Act standards, but those standards themselves remain in draft.
The OCC's proposed rule, published in March, sets a three-tier liquidity framework: at least 10% of outstanding stablecoins must be redeemable the same business day in Federal Reserve deposits or cash equivalents; at least 30% within five business days in high-quality liquid assets; at least 60% in standard reserve assets including securities. If Treasury's comparability criteria adopt the OCC's three-tier framework as the baseline, any foreign issuer that designed its reserve structure to meet Japan's or Hong Kong's requirements may face a retrofit—or exclusion.
Every Asian issuer planning U.S. market access is now building against a gate with no published opening mechanism—and no indication when one will appear.
The no-yield prohibition creates a parallel risk. The GENIUS Act prohibits permitted payment stablecoin issuers from paying interest or yield to holders. That prohibition is the regulatory design choice that most directly enforces the distinction between payment stablecoins and tokenized Treasury funds. Japan's revised Payment Services Act previously required trust-type stablecoins to hold backing assets in demand deposits, limiting yield. The 2026 amendments relaxed that constraint, allowing management in instruments other than demand deposits—such as government bonds—under certain conditions, explicitly to improve issuer economics.
If a Japanese bank issues a yen stablecoin under Japan's framework using the newly permitted management methods, and Treasury's comparability criteria later determine that such reserve management violates the no-yield prohibition because it generates float income, the issuer faces a choice: redesign the product to eliminate yield and reapply under U.S. criteria, or forego U.S. market access entirely.
The sanctions architecture compounds the problem. The GENIUS Act grants the Treasury Secretary unilateral authority to exclude any foreign issuer from U.S. markets on national security or sanctions grounds, independent of whether the home jurisdiction has received a comparability determination. That exclusion mechanism operates without a GENIUS Act administrative proceeding. The United States has three independent ways to exclude a foreign issuer: deny the comparability determination, revoke it after issuance, or invoke the sanctions override. All three require no publication of criteria in advance. For an issuer in Hong Kong or Japan planning U.S. market access, the gate exists but the key does not—and even if Treasury eventually cuts the key, it retains the authority to change the lock.
The structural consequence is fragmentation through regulatory silence rather than coordination. The GENIUS Act was designed to establish a federal framework that could serve as a global standard, with comparability determinations providing the mechanism for mutual recognition of equivalent foreign regimes. That architecture assumes Treasury will publish criteria, foreign jurisdictions will align their frameworks, and determinations will follow. What is happening instead is that Asian jurisdictions are proceeding without waiting for U.S. coordination, establishing standards through actual implementation while Treasury's criteria remain unpublished, creating a de facto divergence that may prove harder to reconcile the longer it persists.
The continuation from last week's coverage is direct: the open thread on whether foreign jurisdictions would establish standards before Treasury criteria now has an answer. They are. Japan's three megabanks are advancing toward fiscal 2026 issuance under frameworks finalized through FSA pilot tests. Hong Kong's two licensed issuers are planning mid-year launches under an operational licensing regime. Both are building against frameworks that exist, that have been tested, that provide a clear path from application to approval. Treasury has published no comparability criteria in the approximately 11 months since enactment, with no NPRM, no timeline, and a statutory deadline 76 days away that covers only domestic rules. Every Asian issuer planning U.S. market access is now building against a gate with no published opening mechanism—and no indication when one will appear.