Crypto Gloss

Terra/Luna

Terra was a layer-1 blockchain whose flagship product was UST (TerraUSD), an algorithmic stablecoin designed to maintain a $1 peg not through collateral but through a mint-and-burn mechanism with its sister token LUNA. In May 2022, the peg broke, triggering a death spiral that destroyed approximately $40 billion in value across LUNA and UST within one week — one of the most catastrophic collapses in crypto history.

How It Worked

UST was an algorithmic stablecoin — it held no dollars in reserve. Instead, it maintained its $1 peg through an arbitrage mechanism:

  • If UST traded above $1, users could burn $1 of LUNA to mint 1 UST and sell it for a profit, increasing UST supply and pushing the price back down.
  • If UST traded below $1, users could burn 1 UST to receive $1 worth of LUNA and sell for a profit, reducing UST supply and pushing the price back up.

The system relied entirely on market incentives and the assumption that demand for LUNA would remain sufficient. There was no collateral backing UST — only LUNA’s own market value.

The Anchor Protocol Problem

Anchor Protocol, a lending/savings protocol built on Terra, offered ~20% annual yield on UST deposits. This yield was largely subsidized rather than organically generated and created enormous artificial demand for UST. At its peak, UST had a market cap of over $18 billion, much of it parked in Anchor chasing the yield.

Critics had warned for months that the yield was unsustainable. The Luna Foundation Guard (LFG), led by Terra founder Do Kwon, accumulated Bitcoin reserves as a backup peg defense mechanism — but the reserve would prove nowhere near large enough.

The Collapse

In early May 2022, large UST withdrawals from Anchor began. The UST peg started slipping — first to $0.98, then lower. As confidence broke, the sell pressure on UST triggered the mint-and-burn mechanism at scale: more LUNA was minted to absorb UST, massively increasing LUNA’s supply and crashing its price. As LUNA’s price fell, each dollar of UST that was burned bought more and more LUNA, which immediately got sold, crashing the price further.

The death spiral became self-reinforcing. LUNA went from ~$80 to effectively zero in approximately 72 hours. UST lost its peg entirely, trading as low as $0.02. The LFG deployed its Bitcoin reserves — approximately $3.5 billion worth — but it was consumed by the selling pressure without stabilizing the peg.

Total losses across UST and LUNA were estimated at approximately $40 billion. Thousands of retail investors lost life savings. Multiple crypto lenders and funds with Terra exposure — including Three Arrows Capital — were pushed into insolvency in the weeks that followed.

Do Kwon and Legal Aftermath

Do Kwon, Terra’s co-founder and CEO of Terraform Labs, launched a new chain (Terra 2.0 / LUNA 2.0) shortly after the collapse in an attempt to rebuild. He was subsequently charged by the US SEC with fraud and with Korean authorities for capital markets violations. After months as a fugitive, he was arrested in Montenegro in March 2023 while traveling on a falsified Costa Rican passport. He was extradited to the United States in late 2024 to face federal fraud charges.

Legacy

Terra/Luna became the canonical case study in algorithmic stablecoin risk. It demonstrated that without genuine collateral, a stablecoin that relies purely on market incentives is vulnerable to a bank-run-style attack or simply a loss of confidence. Following the collapse, regulators in multiple jurisdictions accelerated efforts to classify and restrict algorithmic stablecoins. The GENIUS Act and similar US stablecoin legislation specifically address the design risks that Terra exhibited.

Related Terms