What Happened

Terra / Luna (UST) — Backtest

$40B|Depeg / Death Spiral|May 9, 2022

Algorithmic stablecoin death spiral — massive UST redemptions triggered reflexive LUNA minting, hyperinflating supply from ~350M to 6.5T tokens and crashing the peg permanently. LFG deployed $2.4B Bitcoin reserve but it was insufficient to absorb $18B in UST redemptions. LUNA went from $80 to $0.00008; UST went from $1.00 to $0.02.

What Hindenrank Would Have Said

As of April 1, 2022

D+
Risk Score
65/100

“High risk — novel algorithmic stablecoin mechanism at unprecedented $30B scale, with the majority of UST demand driven by an unsustainable 20% yield subsidy, creating reflexive death spiral exposure if confidence breaks.”

Mechanism Novelty12/15
Interaction Severity20/20
Oracle Surface6/10
Documentation Quality4/10
Track Record6/15
Scale Exposure10/10
Regulatory Risk5/10
Protocol Vitality2/10

Grade Predicted This Failure

Flagged by dimensions: Mechanism Novelty, Interaction Severity, Oracle Surface, Scale Exposure

One or more collapse scenarios directly matched the actual failure mode.

Top Risks Identified

  1. 1.UST's algorithmic mint/burn peg mechanism is reflexive: under sustained selling pressure, LUNA is minted to absorb UST redemptions, diluting LUNA supply, which reduces its market cap and makes it progressively harder to defend the peg — a classic death spiral dynamic observed in Iron Finance's TITAN collapse in June 2021.
  2. 2.Anchor Protocol's ~20% fixed yield on UST deposits is structurally unsustainable. Deposits ($13.3B) exceed borrows ($1.4B) by 10:1, creating an estimated $1.8B annual deficit funded from a depleting yield reserve. If the rate drops significantly, UST demand could contract rapidly, triggering large-scale redemptions into the mint/burn mechanism.
  3. 3.The entire $30B+ Terra ecosystem's stability depends on a single untested mechanism at unprecedented scale. No algorithmic stablecoin has ever maintained its peg through a severe market-wide downturn at this TVL. The 2021 UST depeg to $0.96 during a market crash exposed oracle congestion issues that have only been partially addressed.
  4. 4.Terraform Labs and Do Kwon face an active SEC investigation and subpoena related to Mirror Protocol's synthetic stock offerings, with Do Kwon initially refusing to comply. This creates jurisdictional risk for the protocol's core development team and could result in enforcement actions that disrupt ecosystem operations.

Collapse Scenarios

Anchor Yield Reserve Exhaustion Triggers UST Death Spiral

Elevated
Trigger

Anchor yield reserve depletes below $100M (currently ~$450M and declining at ~$300M/month) OR Anchor APY drops below 10%, causing depositors holding >50% of Anchor's $13.3B in UST deposits to withdraw within a 30-day period.

Cascade
1.
Anchor yield reserve exhaustion forces rate cut from 20% to organic rate (~3-5%)→Massive UST outflows from Anchor as yield-seeking capital exits — $7-10B of UST looking for the exit
2.
UST sellers flood the Terra mint/burn module to redeem UST for $1 of LUNA→LUNA supply expands rapidly as billions of UST are redeemed, creating massive LUNA selling pressure
3.
LUNA price crashes as newly minted LUNA is sold on market→LUNA market cap shrinks, reducing the 'implicit backing' for remaining UST. Each $1 of UST redeemed mints more LUNA tokens at the lower price.
4.
Reflexive minting accelerates: lower LUNA price means more LUNA minted per UST redeemed→LUNA enters hyperinflationary spiral — supply could expand from ~350M to billions of tokens within days
5.
LFG deploys Bitcoin reserve to defend peg, but BTC has declined in the same market downturn→Reserve proves insufficient: $2.4B in BTC (likely worth less during crisis) cannot absorb $18B in UST redemptions
6.
UST breaks below $0.90 and confidence collapses irreversibly→Complete depeg — UST goes to near-zero as remaining holders rush to exit, LUNA supply hyperinflates to trillions of tokens
Historical Precedent

Iron Finance / TITAN collapse (June 2021): identical reflexive minting death spiral on a partially-algorithmic stablecoin, resulting in TITAN going from $65 to near-zero in hours and IRON breaking its peg permanently. Iron Finance had ~$2B TVL — Terra's $30B makes the same mechanism 15x more dangerous. Basis Cash, co-founded by Do Kwon under a pseudonym, also failed to maintain its algorithmic peg in early 2021.

Coordinated UST Sell Pressure Overwhelms Mint/Burn Arbitrage

Moderate
Trigger

A single entity or coordinated group sells >$500M of UST on Curve and DEXes within 24 hours, pushing UST below $0.98, while broader crypto markets decline >20% reducing LUNA market cap and LFG Bitcoin reserve value simultaneously.

Cascade
1.
Large UST sell orders on Curve UST-3pool push UST to $0.97-0.98→Arbitrageurs begin buying cheap UST to redeem for $1 of LUNA via Terra's mint/burn module, but selling volume exceeds arbitrage capacity
2.
UST depeg below $0.97 triggers panic among Anchor depositors→Anchor withdrawal queue spikes as depositors rush to convert UST to USDC/USDT — Anchor's $13.3B in deposits becomes a source of forced UST selling
3.
Terra validator oracle prices lag behind rapidly moving LUNA market price→Mint/burn arbitrage becomes mispriced — oracle reports stale LUNA prices, meaning UST redeemers receive fewer LUNA than market value, further breaking confidence in the peg mechanism
4.
LUNA minting from mass UST redemptions crashes LUNA price below $50 (from ~$110)→Anchor bLUNA collateral liquidations cascade, adding LUNA sell pressure on top of algorithmic minting pressure
5.
LFG manually deploys Bitcoin reserve but BTC has fallen 30%+ in the same market downturn→Reserve buys UST on Curve but runs out before restoring peg — market realizes the backstop has failed
6.
Confidence collapse: no buyer for UST at any price near $1→UST and LUNA enter terminal death spiral — entire Terra ecosystem ($30B TVL) faces existential failure
Historical Precedent

The May 2021 UST depeg to $0.96 during a broader crypto crash was an early warning of this exact scenario. Oracle votes were congested and the mint/burn arbitrage failed to restore the peg quickly. Columbus-5 addressed the oracle congestion but did not address the fundamental reflexivity of the mint/burn mechanism at $30B scale.

Regulatory Action Against Terraform Labs Disrupts Ecosystem Operations

Moderate
Trigger

SEC escalates enforcement against Do Kwon and Terraform Labs beyond the Mirror Protocol investigation, potentially classifying UST or LUNA as unregistered securities, or South Korean regulators pursue criminal charges related to tax evasion or securities violations.

Cascade
1.
SEC files formal charges or South Korean prosecutors issue arrest warrants related to Terraform Labs→Market panic — LUNA sells off 30-50% on regulatory fear, UST faces selling pressure as confidence in the ecosystem's legal viability drops
2.
Do Kwon or key Terraform Labs engineers face travel restrictions or asset freezes→Core development team cannot maintain or update critical infrastructure (oracle module, mint/burn parameters, Anchor rate adjustments)
3.
Exchanges begin delisting UST and LUNA in regulated jurisdictions→Liquidity for LUNA dries up on major exchanges, reducing the market's ability to absorb LUNA from UST redemptions — amplifying death spiral risk
4.
LFG Bitcoin reserves potentially frozen or inaccessible due to legal proceedings→The peg defense backstop becomes unavailable during the exact period it would be needed most
5.
Institutional holders and protocols integrated with Terra (Wormhole, Cosmos IBC partners) begin unwinding positions→Systematic derisking triggers the Anchor outflow and UST redemption cascade described in CS-1
Historical Precedent

The SEC's September 2021 subpoena to Do Kwon at the Messari conference, and Kwon's adversarial response (suing the SEC), established a pattern of regulatory confrontation. The February 2022 court order requiring compliance with the subpoena escalated the situation. Mirror Protocol's synthetic stock offerings clearly fall under securities regulation, creating exposure for the broader Terra ecosystem.

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