For several years, Japan has been experiencing an economic situation that would make many a finance minister pale: abysmal public debt, frozen interest rates and a yen that seems to be slowly slipping into oblivion. Once a bastion of stability, the Japanese currency is today the favorite hunting ground of some wily investors. Among them, Metaplanet, a crypto company that smelled a windfall. Because in finance, crises are also opportunities. Especially when you know how to transform a weak note into a growth lever.


In brief
- Japan has a debt ratio of 250%, which is permanently weakening the yen.
- Metaplanet buys bitcoin with funds raised in yen, which are cheaper to repay.
- In dollar terms, bitcoin has gained 1,159% since 2020; in yen, it’s 1,704%.
- The cost of Metaplanet coupons is falling because they are denominated in a constantly losing currency.
The yen as an Achilles heel: Japan under pressure, Bitcoin on the lookout
Japan carries a colossal public debt, equivalent to around 250% of its GDP. A situation that some would describe as a ticking time bomb. But by buying back its own bonds, the Bank of Japan is artificially keeping interest rates at unrealistic levels. Which has the side effect… of weighing down the yen.
Economist Robin Brooks analyze this paradox with lucidity:
The key point to understand is that long-term interest rates in Japan — although they have risen significantly — remain far below what they would be if markets could set them freely. Currently, the Bank of Japan remains a major buyer of government bonds in gross volume, meaning long-term yields are effectively capped.
Result ? The yen becomes the collateral victim of monetary policies considered too flexible. And faced with this context, bitcoin presents itself as a bulwark. Not only does it escape inflationary logic, but it appreciates much more quickly in the face of a currency in free fall.


Since 2020, BTC has gained 1,704% in yen versus 1,159% in dollars. The gap is clear, and the smartest know how to take advantage of it.
Metaplanet, or the art of exploiting a systemic imbalance
This is precisely what Metaplanet understood. The Japanese company specializing in bitcoin reserves didn't just buy BTC. It did so with financing designed as a geo-financial arbitrage strategy. By using a currency that is losing value (the yen) to buy a deflationary asset like bitcoin, it optimizes its cost of capital.
Adam Livingston, crypto investor and BTC analyst, details this mechanism clearly in a series of tweets:
Each coupon that Metaplanet pays is in a currency that has lost value compared to BTC and the dollar. Thus, the real cost (expressed in BTC) of this 4.9% coupon continues to decrease.
By comparison, Strategy — its U.S.-based competitor — pays a 10% coupon, in dollars. Result: when both companies buy the same amount of bitcoin, Metaplanet retains more net value per share. A benefit that accumulates and accelerates the growth of book value.
Japan weakens, Metaplanet grows: when bitcoin serves as strategic leverage
With 35,102 BTC in its coffers, Metaplanet now ranks fourth in the world among companies holding the most bitcoins in reserve. And this, despite an overall fall in the sector. Its latest purchase of 4,279 BTC for $451 million demonstrates its strategic aggressiveness. While others row, Metaplanet stacks the pieces.
This model could inspire other companies located in countries with structurally weak currencies. Imagine an Argentinian or Turkish company replicating this strategy with pesos or Turkish liras. The logic is simple: borrow in soft currency, invest in bitcoin, repay in weakened currency. A carry trade crypto version.
In Japan, this strategy benefits from particularly fertile ground. The yen is historically used in leveraged strategies. In finance, we call this “carry”. And in a world where bitcoin is a safe haven, this gives a new dimension to the concept.
Key figures to remember
- Bitcoin price at time of writing: $92,519;
- Japan's debt-to-GDP ratio: around 250%;
- Return of bitcoin since 2020: in dollars: +1,159% and in yen: +1,704%;
- Metaplanet coupon: 4.9% (in yen);
- Coupon Strategy: approximately 10% (in dollars).
Metaplanet's strategy impresses, but another recent operation steals the show. Tether has just struck a big blow, with a spectacular purchase of 8,888 BTC. In the world of crypto treasures, the competitions are on, and the numbers are dizzying. At this rate, even maximalists will have to keep track of the accounts with a calculator.
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