Terra Luna Stablecoin Collapses: $40 Billion Evaporates in Three Days
What happened
The TerraUSD (UST) algorithmic stablecoin lost its dollar peg in May 2022, triggering a death spiral with its sister token LUNA. UST was backed not by real assets but by a mint/burn mechanism with LUNA. As UST fell below $1, users rushed to exit, hyperinflating LUNA from billions to trillions of tokens and destroying $40 billion in market value within days.[1]
What went wrong
An algorithmic stablecoin backed only by its paired token has no exogenous peg support — stability depended entirely on market confidence. Once confidence broke, the mint/burn mechanism created a hyperinflationary death spiral with no circuit breaker. The system was mathematically fragile by design.[1]
Lesson learned
A stablecoin whose stability depends on a reflexive relationship with another volatile token is not stable — it is a game-theoretic equilibrium that fails catastrophically when confidence breaks. Algorithmic stability mechanisms must be stress-tested against adversarial coordinated selling scenarios.
Sources
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