The Terra-Luna Collapse — The Death Spiral of an Algorithmic Stablecoin
How did a coin that claimed to be 'always $1' approach zero in a matter of days? It is the ending of an experiment that tried to hold value with code alone, without collateral.
The Structure of Stablecoins and UST
A stablecoin is a crypto asset that tries to peg its price to a benchmark such as $1. Usually it holds assets like actual dollars or government bonds as collateral to back its value.
Terra's UST, however, was an 'algorithmic stablecoin' that tried to hold $1 without dollar collateral, relying only on exchange with its sister coin Luna (LUNA). Each UST was designed so it could always be swapped for $1 worth of Luna, and this structure worked fatally during a crisis.
The Death Spiral
In early May 2022, as large sums flowed out, UST began to break below $1 (a depeg). To restore the peg, the structure minted large amounts of new Luna, which instead sent Luna's price crashing.
The cheaper Luna got, the weaker its power to support UST became, so UST broke down further, more Luna was minted, and a vicious cycle — the so-called 'death spiral' — ensued. Luna collapsed from about $87 on May 5 to around $0.00005 on May 13, and UST from $1 to below $0.2.
In a matter of days, more than about $40 billion in Luna and UST market capitalization evaporated, and including related losses it is estimated at up to $60 billion.
The Lesson — Risk in the Name of 'Stability'
The Terra-Luna episode starkly shows that the name 'stable' does not guarantee stability. A peg that relies only on code and market trust, without collateral, can collapse in an instant the moment that trust breaks.
Also, deposit services offering high interest such as 'a 20% annual yield' amplified the crisis. An excessively high yield can be a signal that a correspondingly large risk is hidden. You should be especially careful of products that promise high returns through structures you cannot understand.
Preguntas frecuentes
Q. Are all stablecoins dangerous?
The risk varies greatly by type. Collateralized types that hold sufficient collateral such as actual dollars and government bonds and disclose it transparently differ in risk level from uncollateralized types that rely on an algorithm alone, like Terra. That said, no stablecoin is completely risk-free, and there have been cases where the peg broke.
Q. Isn't a 20% annual interest rate a good thing?
For excessively high interest, you must always ask where that return comes from. Terra's high interest was not sustainable, and when the inflow of funds stopped, the whole structure collapsed. If there is no clear answer to 'why can it pay such a high return,' that is a warning sign.
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