Stablecoin Market Faces Liquidity Shocks Amid De-Pegging Events

The stablecoin market has faced significant stress in recent times, particularly in 2022 and 2023. While they are often categorized as either volatile or stable, this dichotomy is not sufficient for systemic risk management. The de-pegging events during this period demonstrated that stability is not an inherent property of design but rather a function of reserve composition and underlying settlement infrastructure.

The premise of a 'digital dollar' obscures structural differences between issuers. Empirical evidence suggests that price-fixing mechanisms and backing assets generate asymmetric responses to liquidity shocks. The collapse of TerraUSD, for instance, did not stem from the same causes as the temporary USDC disconnection during the Silicon Valley Bank bankruptcy.

The USDC case in March 2023 is a paradigmatic technical study. Circle held approximately USD 33 billion in deposits at SVB, equivalent to 8% of total reserves. The bank's insolvency declaration did not produce an immediate accounting loss but rather a liquidity availability crisis. The market recognized that the USDC redemption mechanism depended on Circle's capacity to mobilize cash over the weekend.

The exchange rate dropped to USD 0.8774, not due to insolvency, but because of uncertainty over settlement timing. The eventual recovery depended exclusively on the FDIC's decision to guarantee uninsured deposits, an exogenous variable to the protocol and not replicable across all jurisdictions.

By contrast, the UST collapse represents a first-order failure in collateral theory. The algorithmic model lacked a terminal backing asset, relying on the expansion and contraction of LUNA supply to absorb volatility. During the contraction phase, the arbitrage mechanism inverted: minting LUNA to redeem UST increased the circulating supply of the former, depressing its price and reducing the system's capacity to support further redemptions.

The differentiation between reserve models must incorporate the concept of underlying asset duration. Tether (USDT) has historically maintained a mixed composition including commercial paper, money market funds, and, more recently, short-term Treasury bills. Commercial paper, with typical maturities of 30 to 90 days, introduces a liquidity mismatch.

Data from research conducted by the Dutch central bank indicate that USDC and TUSD exhibit greater sensitivity to banking shocks, while USDT and DAI show relative resilience during periods of crypto market stress, albeit for opposing reasons. DAI, being over-collateralized with digital assets such as ETH and WBTC, incorporates a buffer that exceeds the nominal value of the debt.

For decentralised finance protocols and hedge funds operating these instruments, exposure management requires stablecoin classification by risk layers. A functional taxonomy could divide into three tiers: (1) assets backed exclusively by Treasury bills with multiple bank custodians and real-time attestation; (2) assets backed by combinations of cash and high-quality commercial paper with concentration limits; and (3) algorithmic assets with no real-asset backing.

The assignment of discount rates for lending or collateral operations should vary significantly across these categories. The derivatives market is beginning to incorporate these differentials, with implied premia in perpetual futures contracts widening during periods of banking uncertainty.