💴 Japan's three megabanks have spent decades fighting over the same customers. Now they want to issue money together. Mizuho, MUFG and SMBC are building a single-brand stablecoin, and the most revealing part isn't the technology. It's that banks are racing to build the very thing that could siphon off their own deposits.

Three rivals, one coin

The plan went official on November 7, 2025, when Japan's Financial Services Agency (FSA) named the project as the first case it would back under a newly created support program. A press release followed the same day.

The shape of it is unusual. Mizuho Bank, MUFG Bank and SMBC will jointly issue a single yen stablecoin under one brand. The three act as joint "settlors" of a trust, while Mitsubishi UFJ Trust and Banking serves as the single trustee that actually issues the coin. The technical plumbing comes from Progmat, a Tokyo digital-asset firm spun out of MUFG's trust bank and co-owned by the three megabank groups. The first planned use is cross-border settlement for the trading house Mitsubishi Corporation.

By June 2026 the banks had hardened the commitment: a basic agreement, a joint council to work out governance, and a target of live transactions sometime in fiscal 2026, which runs through March 2027.

Why one brand instead of three competing ones? A payment rail is only useful once enough players share it, and a tangle of incompatible coins would choke that network effect before it forms.

The structure that erases the 1-million-yen wall

Most yen stablecoins a Japanese consumer can touch today come with a leash. Foreign coins such as USDC, and consumer-facing yen coins such as JPYC, are capped at 1 million yen (roughly $6,200 at about 162 yen to the dollar) per transfer. For buying coffee, fine. For settling a corporate invoice, useless.

The megabank coin is built on a different legal footing. It is a "trust-type" stablecoin, classed as a type-3 electronic payment instrument. The banks place yen into a trust, and the trustee issues coins against it. Because the backing assets sit in a bankruptcy-remote trust, they stay 100% protected even if the issuer collapses. And, just as importantly, there is no transfer cap. That one structural detail is what makes the coin usable for the seven-figure payments that move between companies every day. USDT and USDC, by contrast, keep their reserves on the issuer's own books rather than walling them off in a trust.

Why would a bank build its own disruptor?

This is the strange part. Stablecoins are, at least in part, a threat to banks. When a company converts a deposit into a stablecoin, that money walks off the bank's balance sheet. Pile up enough of those conversions and you weaken the cheap funding base banks lend against. It echoes the 1970s in the US, when money-market funds offered better yields than savings accounts and consumers pulled cash out of banks in droves, a process economists call disintermediation.

So why would three banks volunteer to build one?

Because standing still is the more dangerous option. If the megabanks do nothing, the deposits drift toward JPYC, toward USDC, toward whoever moves first, and the banks lose both the money and the customer. By issuing the coin themselves and keeping the backing inside their own group through Mitsubishi UFJ Trust, they keep the funds in the family. It is a defensive crouch dressed up as innovation: if disintermediation is coming either way, better to be the one doing the disintermediating.

The law finally caught up

None of this would work without a legal scaffold, and Japan rebuilt one just in time. A revised Payment Services Act took effect on June 1, 2026. It created a lighter-touch "intermediary" license for firms that only match buyers and sellers without holding customer assets. More consequentially for the banks, it loosened the rules on what can back a trust-type coin.

Until now, those reserves had to sit in demand deposits, earning essentially nothing. Under the revision, issuers can hold safer yielding assets such as short-dated government bonds for up to roughly half the total, with an obligation to top up the trust if the value slips. Yield changes the math: a reserve that earns something is a reserve a bank can actually build a business on. The same revision also added a post-FTX safeguard letting regulators order assets kept onshore.

Banks everywhere are making the same move

Japan is not acting in a vacuum. In the United States, the GENIUS Act, signed in July 2025, became the first comprehensive federal stablecoin law, requiring one-to-one backing, redemption rights and anti-money-laundering checks. JPMorgan and other US banks have pushed their own coins, even as the American banking lobby fights stablecoin issuers over whether they may pay interest, again because of deposit-flight fears. On central-bank money the Trump administration went the other way entirely, moving to ban a US CBDC outright.

Europe got there earlier on the rulebook. Its MiCA regime has been in force since late 2024, with a hard licensing deadline of July 1, 2026, and it caps large non-euro stablecoins to protect the single currency. As for a digital yen, the Bank of Japan is still running pilots and has not decided whether to issue one at all; Governor Kazuo Ueda has signaled a decision could come around 2026. For now, the private sector is moving first.

The pattern across all three regions is the same. Bank-consortium coins, JPMorgan in the US, ING in Europe, and now three Japanese giants, are emerging as the incumbents' answer to USDT and USDC. On that specific race, Japan is unusually far forward.

For most of modern history, "the bank" meant the place that held your deposits. The megabanks are betting that in the on-chain era it can also mean the place that issues the token those deposits turn into. Whether companies actually pick it, over JPYC, over the bank-deposit token DCJPY, over the SBI and other trust-coins now lining up behind it, is still an open question.

In Japan, the banks decided the safest way to handle a disruption was to lead it. How are the banks in your country reacting to stablecoins, building their own, or trying to hold them back?

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