Terra Luna Collapse: How UST Lost Its Peg and $40 Billion Vanished (May 2022)

In May 2022, the algorithmic stablecoin TerraUSD lost its dollar peg and its paired token LUNA hyperinflated from a few hundred million tokens to roughly 6.5 trillion in three days, destroying an estimated $40 billion of market value in a week. The collapse triggered the contagion that took down Three Arrows Capital, Celsius, and Voyager. Founder Do Kwon was sentenced to 15 years in prison in December 2025.

1. What Terra Was: The Mint-and-Burn Mechanism

• Event Background: Terraform Labs, founded in 2018 by Do Kwon and Daniel Shin, built a Cosmos-based blockchain around a family of algorithmic stablecoins. The pitch was a stablecoin that needed no dollar reserves, no bank, and no auditor — stability produced purely by arbitrage incentives.
• Event Details: UST maintained its peg through a swap with LUNA, the chain's volatile native token. Anyone could always burn $1 worth of LUNA to mint 1 UST, or burn 1 UST to mint $1 worth of LUNA, with the protocol calculating LUNA's dollar value from an oracle price. If UST traded at $0.98, arbitrageurs could buy it cheaply, redeem it for $1 of LUNA, and sell — reducing UST supply until the price recovered. If UST traded above $1, the reverse trade expanded supply.
• Technical Architecture Innovation:
  • The reflexivity problem, built in: The mechanism only works if LUNA has enough market value to absorb redemptions. UST's backing was the market capitalization of a token whose main source of demand was UST itself. Each system supported the other, which works in one direction and fails in the other.
  • No exogenous collateral, by design: Unlike USDC or Dai, UST held no external assets. The design was presented as the innovation — a stablecoin that scales without needing dollars — and it was the specific property that made the failure unrecoverable.
• Direct Impact: At its peak, UST was the third-largest stablecoin with a supply approaching $18 billion, and LUNA reached an all-time high of $119.51 in April 2022, placing it among the ten largest cryptocurrencies.
• Long-term Significance:
  • The category did not survive: Uncollateralized algorithmic stablecoins have not returned at scale. Post-2022 stablecoin regulation, including MiCA and the US GENIUS Act, effectively requires reserve backing.
• Lessons Learned: A stablecoin backed by a token whose value depends on the stablecoin is not collateralized. It is a closed loop that holds only while it grows.
• Subsequent Development: The 2025 depeg of the xUSD synthetic dollar and similar incidents show that variants of the design keep reappearing in less prominent forms.

2. Anchor Protocol and the 19.5% Yield

• Event Background: The mint-and-burn mechanism alone would not have created $18 billion of UST demand. That came from a single application.
• Event Details: Anchor Protocol, launched in March 2021, offered depositors a rate advertised at around 19.5% on UST — dramatically above yields on other major stablecoins. In principle the yield came from borrowers' interest and staking returns on collateral. In practice both sides were subsidized: the National Bureau of Economic Research analysis of the collapse found that by April 2022, the daily subsidy had reached roughly $6 million, funded from a yield reserve that was steadily draining.
• Technical Architecture Innovation:
  • A rate that could not be lowered safely: Anchor's yield was the reason to hold UST. Cutting it would reduce demand and shrink UST supply, which was the outcome the whole system needed to avoid. In May 2022 the community moved to a semi-dynamic rate that could adjust by up to 1.5 percentage points a month, and the rate began falling from 19.5%.
  • Concentrated withdrawal risk: Because most UST sat in one protocol, the entire stablecoin's demand had a single point of failure. When Anchor deposits started leaving, UST supply had to shrink through the LUNA swap, which is exactly the mechanism that becomes destabilizing under stress.
  • The Bitcoin reserve as a patch: In January 2022 the Luna Foundation Guard was established in Singapore with Do Kwon as director, raising $1 billion through a LUNA sale led by Jump Crypto and Three Arrows Capital. It accumulated bitcoin as an exogenous reserve. A post-collapse audit found LFG held approximately 80,300 BTC plus $26 million in USDT and $24 million in USDC as of May 6, 2022 — a reserve worth a few billion dollars against a stablecoin supply of roughly $18 billion.
• Direct Impact: The yield attracted retail savers worldwide, including in South Korea, where Terra was widely held and where a large share of the eventual losses fell.
• Long-term Significance:
  • A textbook run setup: A high, subsidized, uninsured yield on a redeemable instrument backed by a volatile asset is the classic precondition for a bank run, described in banking literature for a century.
• Lessons Learned: If a yield is paid from a reserve rather than earned from borrowers, the correct question is how long the reserve lasts, not how high the rate is.
• Subsequent Development: Post-2022, stablecoin yields are typically sourced from short-term Treasury returns and disclosed as such, a direct response to what Anchor demonstrated.

3. May 7-13, 2022: The Death Spiral

• Event Background: The crypto market was already falling in early May 2022 alongside equities. Terra's design meant a general risk-off move would test the peg at the worst possible time.
• Event Details: On May 7, 2022, two large addresses withdrew 375 million UST from Anchor, and several hundred million dollars of UST were sold through Curve in quick succession, knocking UST slightly off peg. Withdrawals accelerated over the weekend. On May 9, LFG announced it was deploying $1.5 billion — half bitcoin, half UST — to over-the-counter trading firms to defend the peg, then transferred essentially all remaining bitcoin to exchanges. The defense failed. As holders exited by swapping UST for LUNA and selling, LUNA's price collapsed, forcing the protocol to mint ever more LUNA per UST redeemed. Over roughly three days, LUNA's supply expanded from a few hundred million tokens to about 6.5 trillion. UST fell to around $0.10, LUNA to effectively zero. On May 12 and again on May 13, validators halted the Terra blockchain, because LUNA had become so cheap that acquiring a governance-attacking stake would have cost only a few million dollars.
• Technical Architecture Innovation:
  • Why the mechanism accelerated the collapse: The redemption path is fixed in dollar terms. As LUNA's price fell, each UST redeemed minted more LUNA, and the additional supply pushed the price down further. The arbitrage that stabilized the system on the way up is the same arbitrage that destroyed it on the way down.
  • Who got out: The Harvard-published analysis of the run found that Alameda Research conducted the largest volume of UST-to-LUNA swaps among Anchor depositors, exiting through the native swap contract that most retail holders did not use because of fees and execution uncertainty.
• Direct Impact: Estimates of value destroyed cluster around $40 billion, with some analyses putting the combined LUNA and UST market capitalization loss closer to $45 billion. The variance comes from whether peak or pre-crash prices are used as the baseline.
• Long-term Significance:
  • The fastest large-scale financial collapse on record: An asset ranked in the global top ten went to zero in under a week, with every transaction publicly visible.
• Lessons Learned: A stabilization mechanism that relies on arbitrageurs assumes those arbitrageurs will keep showing up. In a run, they are the first to leave.
• Subsequent Development: A new chain, Terra 2.0, launched on May 28, 2022 with a fresh LUNA token and no stablecoin; the original chain continued as Terra Classic with LUNC.

4. The Contagion

• Event Background: Terra's failure would have been contained if its exposure had been limited to its own holders. It was not.
• Event Details: Three Arrows Capital, a hedge fund managing roughly $10 billion at its peak, had invested heavily in LUNA and lost the position entirely. Because 3AC had borrowed from nearly every major crypto lender with little collateral, its insolvency propagated directly. A British Virgin Islands court ordered its liquidation on June 27, 2022, and it filed for Chapter 15 in New York days later. Celsius Network froze withdrawals for 1.7 million accounts on June 12, 2022 and filed for bankruptcy in July with a $1.2 billion balance-sheet hole. Voyager Digital filed in July, and BlockFi and Genesis followed within months.
• Technical Architecture Innovation:
  • Undisclosed leverage as the transmission channel: The lenders that failed had made large unsecured loans to a single counterparty, and none of them could see each other's exposure. The absence of a credit registry, standard in traditional finance, meant the same collateral effectively backed multiple loans.
• Direct Impact: The 2022 credit crisis wiped out most of the industry's centralized lending sector within six months.
• Long-term Significance:
  • The path to FTX: Alameda Research's losses in the same period, and the funds it received from FTX to cover them, are central to the collapse that followed in November 2022. Terra is where the 2022 cascade begins.
  • DeFi lending held up: Over-collateralized on-chain lenders such as Aave, Compound, and MakerDAO liquidated positions automatically and continued operating throughout, a contrast the industry cites regularly.
• Lessons Learned: Opaque, undercollateralized credit between institutions is where crypto reproduces the failure modes of traditional finance, without the backstops.
• Subsequent Development: Proof-of-reserves reporting, third-party attestations, and segregated custody became standard demands from institutional counterparties after 2022.

5. Legal Outcomes and Common Misconceptions

• Event Background: The legal consequences ran for three and a half years across four jurisdictions.
• Event Details: The SEC sued Terraform Labs and Do Kwon in February 2023. Kwon was arrested in Montenegro in March 2023 while attempting to travel on a forged passport. In April 2024, a New York jury found Terraform Labs and Kwon liable for civil fraud, and in June 2024 the parties settled with the SEC for approximately $4.5 billion. Terraform Labs filed for Chapter 11 in January 2024 and wound down. Kwon was extradited to the United States and arrived on December 31, 2024. He pleaded guilty in August 2025 to conspiracy and wire fraud counts, and on December 11, 2025, Judge Paul Engelmayer sentenced him to 15 years — longer than the 12 years prosecutors had sought — and ordered forfeiture of over $19 million. The court found restitution impracticable given the number of victims.
• Technical Architecture Innovation:
  • UST did not fail because of a hack or a single attacker: The most persistent misconception is that a coordinated short attack broke the peg. The NBER analysis found the run was driven by broad-based withdrawals amid rising doubts about sustainability, not by concentrated third-party manipulation. The design failed under ordinary stress.
  • The $40 billion figure explained: It measures the combined market capitalization of LUNA and UST destroyed over the week, not money invested. Actual cash losses to depositors were smaller and are not precisely known.
• Direct Impact: The collapse is the direct cause of most stablecoin regulation written since 2022, including MiCA's reserve and redemption requirements for e-money tokens.
• Long-term Significance:
  • A closed legal chapter with an open technical one: The prosecutions are finished; the design question — whether any uncollateralized stablecoin can be stable — is settled empirically for now but keeps being retested.
  • Terra Classic persists: The original chain still runs with a community attempting to burn down the trillions of LUNC in supply, one of crypto's more unusual afterlives.
• Lessons Learned: When the mechanism that maintains a peg is also the mechanism that dilutes the backing, the system has no stable state below a certain confidence level.
• Subsequent Development: Kwon also faces charges in South Korea, and the US court indicated it would support a transfer there after he serves half of his American sentence.