Stablecoin Depeg Risk: What Settlement Desks Must Price

In March 2023, one of the largest dollar stablecoins traded as low as roughly 87 cents over a single weekend after a regional US bank holding part of its reserves failed. The coin recovered within days, but the episode made a point every settlement desk now has to face: an on-chain trade that settles in seconds is only as final as the cash token on the other side. As stablecoins move from crypto trading pairs into the cash leg for real-world asset trades, stablecoin depeg risk stops being a market curiosity. It becomes a line item in settlement risk.

Why the Cash Leg Matters More Than the Asset Leg

A tokenized gold bar, a carbon credit or a CRE interest can be checked against custody records, registries and title. The payment token is often assumed to be worth exactly one dollar. That assumption holds most of the time, and the value case is real: settlement around the clock, no correspondent banking chain, and delivery-versus-payment logic that removes principal risk between counterparties.

But delivery-versus-payment only removes counterparty risk. It does not remove instrument risk. If a seller receives 10 million units of a stablecoin trading at 0.97, the trade settled atomically and the seller still lost $300,000 against par. For a desk that marks positions in dollars, that gap is the exposure. It shows up most when it hurts: in a stress event, when on-chain liquidity thins and redemption queues grow.

The Bank for International Settlements has framed this as a "singleness of money" problem. Money is only useful for settlement if every unit trades at par with every other unit, without question. Private stablecoins get to singleness through reserves and redemption rights, not by law. Measuring depeg risk means measuring how well those mechanisms hold up under stress.

Four Variables That Drive Depeg Risk

Institutional desks that use stablecoins as settlement assets tend to come down to four variables.

1. Reserve composition. Short-dated Treasury bills and overnight reverse repo behave very differently from uninsured bank deposits or commercial paper. The 2023 episode was a deposit-concentration event, not an insolvency. Desks should know what share of reserves sits in cash at a single institution, and how quickly the rest can become cash at par.

2. Redemption access and speed. A stablecoin is redeemable at par only for the people who can redeem it. If direct redemption is limited to onboarded institutions with high minimums, everyone else depends on secondary-market liquidity. In a run, that liquidity is exactly what disappears. The useful questions: Is your firm, or your settlement agent, a direct redeemer? What is the cutoff time? Are redemptions processed on weekends?

3. Attestation cadence and quality. Monthly attestations from an independent accountant are now the baseline. They are still a point-in-time snapshot. Desks increasingly want machine-readable reserve data that a smart contract or risk system can query continuously, the same logic behind proof of reserve for RWAs. A reserve figure that updates every block tells you more than a PDF published three weeks after month-end.

4. Legal claim in insolvency. If the issuer fails, are reserves held bankruptcy-remote for holders, or do holders queue with general creditors? The US GENIUS Act moves payment stablecoins toward 1:1 high-quality reserves, regular public disclosure and holder priority. That narrows the tail but does not remove operational risk. A reserve that is legally protected but stuck in a frozen bank account can still trade below par for a weekend.

How Depegs Actually Unfold

Past stress events tend to follow the same sequence, and knowing it helps desks set triggers. First comes a news shock, usually about a reserve custodian, a banking partner or a regulatory action, often outside banking hours when direct redemption is closed. Second, secondary-market holders who cannot redeem sell into on-chain liquidity pools and venue order books, and the price drops below par. Third, arbitrageurs who can redeem buy at a discount, but only as fast as the issuer's redemption window and their own balance sheets allow. If the reserve concern is resolved, the price returns to par once banking rails reopen. If it is not, the discount widens.

Two lessons follow. Timing risk peaks on weekends and holidays, which is exactly when always-on settlement is supposed to add value. And the size of the discount reflects redemption friction as much as reserve quality. A fully backed coin with slow, gated redemption can trade further below par during a scare than a slightly weaker coin with fast, open redemption. Desks that look only at the reserve report miss half the picture.

Building a Depeg Policy for Settlement

The firms handling this well treat stablecoins the way a treasury desk treats any money-market instrument: approved-instrument lists, limits and contingency plans.

• Approved-issuer list. Define which stablecoins can be used for settlement, based on the four variables above, and review the list quarterly.
• Concentration limits. Cap intraday and overnight balances held in any single stablecoin. Many desks sweep settlement proceeds to bank deposits or tokenized money market fund shares by end of day, so stablecoin exposure lasts hours, not weeks.
• Price triggers. Set a deviation threshold, for example 50 basis points from par on a reference price feed, that automatically pauses new settlements in that token and sends them to an alternate cash leg.
• Alternate rails. Keep at least two stablecoins and one fiat path live, so a depeg in one instrument interrupts nothing.
• Oracle-based monitoring. Pull independent price and reserve data from decentralized feeds, such as Chainlink Data Feeds and Proof of Reserve, rather than a single venue's last trade, which a thin order book can distort.

None of this cancels out the value of stablecoin settlement. It is how that value holds up when markets are stressed. A trade that settles in seconds, at 3 a.m. on a Sunday, against a cash token you have already risk-rated, beats a T+2 wire. The work is in doing the risk-rating up front.

What This Means for Real-World Asset Markets

Tokenized assets push stablecoin exposure into places it has never been. A gold buyer in Singapore paying a seller in Zurich, a carbon credit buyer settling a forward, a CRE investor receiving a quarterly distribution: each carries the cash token's risk for as long as it holds the token. Distributions are the subtle case. An investor who receives income in a stablecoin and holds it for weeks carries depeg exposure the sponsor never intended to pass on.

That makes the choice of cash leg a structuring decision, not a back-office detail. Sponsors and platforms should disclose which settlement tokens they accept, how distributions can be redeemed to fiat, and what happens if a token deviates from par mid-cycle. Investors should be able to choose their payout rail. For a deeper look at how the cash and asset legs fit together, see our explainer on what RWA tokenization is.

As settlement volumes grow, depeg risk will be priced as routinely as FX risk, through limits, hedges and monitoring rather than assumptions. Desks that build that discipline now will be able to use instant settlement at scale. Desks that assume a dollar is always a dollar will learn otherwise during the next stressed weekend.

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