How do liquidity risk and solvency risk differ? Why did USDC depeg but fully recover?
Solvency risk means reserves are fundamentally insufficient — UST had no real reserves and never recovered after collapse. Liquidity risk means reserves are sufficient but temporarily inaccessible — in March 2023 when SVB was seized, Circle had $3.3B stuck there but total reserves were whole; FDIC covered deposits and USDC fully recovered in three days. Liquidity crises are typically temporary and fixable; solvency crises are typically permanent and irrecoverable. When evaluating a depeg, ask first: do the reserves genuinely exist? If yes, the depeg may be temporary liquidity pressure rather than structural collapse.
Which types of stablecoins have highest and lowest liquidity risk?
Ordered by reserve liquidity from low to high risk. Lowest: USDC, USDT — cash and short-term T-bills, near-instantly liquidatable, deepest secondary markets; large redemptions satisfied in minutes to hours. Medium: USDS — reserves mix high-liquidity T-bills and private credit RWA (possible 1-3 year lockups); Sky maintains a Liquidity Buffer, but if redemptions exceed the buffer, risk emerges. Higher: RWA stablecoins with real estate or private loans — may take months to liquidate. Highest: small stablecoins with thin DEX pools only — large sells cause major slippage and depeg.
How do you assess liquidity risk before depositing?
Four publicly checkable metrics. First, reserve composition liquidity: what portion can be liquidated in one day (cash, T-bills) vs. weeks to months (private credit, real estate) — visible in governance reports or DeFiLlama. Second, reserve bank concentration: the USDC/SVB event showed even real reserves concentrated in one bank can cause short-term access interruption. Third, secondary market depth: check CoinGecko or Kaiko — if a $10M sell moves price more than 0.5%, liquidity is thin. Fourth, historical stress tests: how the protocol handled large redemptions in past panics is the most real-world test.
Advanced: how does the Stablecoin bank-run pattern work? What protection mechanisms exist?
Stablecoin runs are faster and more intense than traditional bank runs. Pattern: trust loss → mass redemption or selling → liquidity consumed → price falls → more panic selling → spiral accelerates. UST's death spiral is the most extreme case; USDC during SVB showed early bank-run characteristics. Four protection layers: holding large amounts of highly liquid reserves (T-bills) for real-time convertibility; maintaining a Liquidity Buffer for on-demand funds; some protocols implement redemption delays or cooling periods to prevent instant depletion; broad exchange listings and deep DEX pools give secondary markets depth to absorb selling. USDC recovered in three days because reserves were intact and policy support arrived — containing the run.
Two 'fully backed' stablecoins with different liquidity fates. Case A: USDC/SVB (March 2023) — 100% real reserves, but $3.3B inaccessible over a weekend; USDC depegged to $0.88 (liquidity risk, not solvency); FDIC covered deposits and it recovered. Case B: USDS private-credit RWA — ~22% in private credit with 1-3 year lockups; mass redemptions would exhaust T-bills first, and a gap emerges if T-bills run out while private credit is still locked. Sky maintains a liquidity buffer, but if redemptions exceed it, the gap surfaces. Lesson: reserve liquidity structure determines whether large-scale redemptions can be handled.
Core trade-off: high-liquidity reserves (T-bills) are safer but earn less; low-liquidity reserves (private credit) yield more but may fail in a crisis. Reserve liquidity and yield have a natural inverse relationship: the safest reserves (cash, T-bills) are near-instantly liquidatable but earn least; private credit yields more but is least liquid. When protocols design reserves, they're inherently choosing between safety and yield. USDS allocating to private credit earns higher SSR yield at the cost of higher liquidity risk. No perfect design exists — only more appropriate trade-offs for the current environment. Evaluating a protocol's immediately liquid reserve composition matters more than just looking at yield.
Missing Link: The most counterintuitive truth about stablecoin liquidity crises: at the worst weekend of a crisis, the assets may exist in perfect condition but simply be inaccessible — the USDC/SVB event proved that 'reserves exist' and 'reserves are available' are entirely different things, and markets switch between the two far faster than any retail investor can react.