The Terra/LUNA Collapse (2022)
In early May 2022, Terra was the third-largest ecosystem in crypto, behind only Bitcoin and Ethereum. Its stablecoin, TerraUSD (UST), sat at exactly $1.00, and its sister token LUNA traded above $80. Within about a week, UST had lost its peg, LUNA had collapsed to fractions of a cent, and roughly $40 billion of market value had evaporated. It was one of the fastest destructions of wealth in financial history, and it dragged the entire market into a prolonged downturn.
What Terra was
Most stablecoins hold real reserves — dollars or bonds in a bank — so each token is backed one-for-one. Terra's UST was different: it was an algorithmic stablecoin, backed not by cash but by code and its sibling token. The mechanism let users always swap $1 of UST for $1 of newly minted LUNA, and vice versa. In theory, arbitrage would defend the peg: if UST fell to $0.98, traders could buy it cheaply, redeem it for $1 of LUNA, and pocket the difference, pushing UST back toward $1.
Demand for UST was supercharged by Anchor Protocol, a lending platform that paid around 20% annual yield on UST deposits. That rate — wildly high and heavily subsidized — pulled in tens of billions of dollars from people who often did not understand that the "stable" dollar they were earning yield on had nothing tangible behind it.
What happened
The design had a fatal flaw. The system minted LUNA to defend UST — but if UST fell far enough, defending it meant printing enormous amounts of LUNA, crushing LUNA's price, which destroyed the very backing UST relied on. This is a classic death spiral.
Starting around May 7–9, 2022, large amounts of UST were rapidly pulled from Anchor and sold — over $2 billion in short order. UST slipped below $1 and could not recover. As the peg broke, holders rushed to redeem UST for LUNA, and the protocol minted LUNA by the trillions to keep up. LUNA's supply exploded and its price cratered: from around $80 to well under $1 within days, and to fractions of a cent by mid-May. UST, meant to be a dollar, fell toward a few cents. Within roughly 72 hours the entire structure was worthless.
Why it happened
An algorithmic stablecoin with no external reserves is only as strong as confidence in it. The moment enough people doubt the peg and rush the exit, the self-reinforcing mechanism that was supposed to save it instead accelerates the collapse. The 20% Anchor yield had attracted "hot" money with no loyalty and no cushion, and there were no dollars in a vault to make anyone whole. It was, in effect, a highly reflexive scheme that worked only while it was growing.
The fallout
The blast radius was enormous. Hedge fund Three Arrows Capital, lenders Celsius and Voyager, and others held Terra exposure or were caught in the ensuing panic; several went bankrupt within weeks, spreading contagion across the industry and helping set up the collapse of FTX months later. Terra co-founder Do Kwon, once a swaggering crypto celebrity, became a fugitive; he was later apprehended, extradited to the United States, and sentenced to 15 years in prison for fraud. Regulators worldwide pointed to Terra as the case for tighter stablecoin rules.
"Stable" is a claim, not a guarantee. A stablecoin backed by real reserves and one backed only by its own sister token are fundamentally different animals — and a yield that looks too good to be sustainable usually is. Understanding what actually backs a coin, and how a depeg unfolds, is the core takeaway.
Why it still matters
Terra is the definitive real-world stress test of algorithmic stablecoins, and the result was total failure. It reshaped how the market — and regulators — think about what the word "stable" can honestly mean. Anyone learning how a stablecoin is supposed to hold its value, or how one comes apart in a stablecoin depeg, is studying, directly or not, the lessons written in the wreckage of May 2022.
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