Stablecoin depeg risk: how digital dollars break, and how to pick safer ones

A stablecoin is a promise: "1 token = $1". A depeg is the moment the market stops believing that promise. For anyone holding stablecoins, this is the risk that matters most — a 10% APY is irrelevant if the token itself suddenly trades at $0.80. This guide walks through how depegs actually happened, what makes some stablecoins more resilient than others, and what you can do about it in practice.

What a peg is — and what a depeg means

A peg is the link between a token's price and the US dollar. The issuer promises that every token can be redeemed for $1 and holds reserves to back that promise. As long as the market believes it, the price hovers around $1.00. Tiny wobbles — $0.999 here, $1.001 there — are normal market noise, not a problem.

A depeg is when the price moves away from $1 noticeably and persistently. Not "half an hour at $0.998" but "$0.95 and falling". And here's the key insight: the trigger is usually not the reserves themselves, but confidence. A piece of bad news, a wave of panic, a rush for the exit. A stablecoin holds exactly as long as most holders aren't trying to leave at the same time. In that sense it works like a bank: solvent on paper, but vulnerable to a run.

That doesn't mean all stablecoins are equally fragile. What happens after confidence cracks depends entirely on what's underneath the token — and that's where real-world history is the best teacher.

Real depegs: not all of them are alike

UST / Terra, May 2022 — the algorithmic one. UST wasn't backed by dollars or bonds. Its peg relied on an arbitrage mechanism with a sister token, LUNA: you could always swap 1 UST for $1 worth of freshly minted LUNA. That works while LUNA has value and people trust the system. When panic hit, the mechanism turned into a death spiral — the more people exited UST, the more LUNA was printed and the faster it collapsed, which destroyed the remaining faith in UST. Within roughly a week, UST went from $1 to effectively zero, wiping out around $40 billion in value. The main lesson of the entire stablecoin era: an algorithmic stablecoin with no real collateral doesn't bounce back under stress — it dies.

USDC, March 2023 — the collateralized one. Circle, the issuer of USDC, held a portion of its cash reserves at Silicon Valley Bank. When SVB failed, markets feared part of USDC's backing was gone, and over the weekend USDC traded as low as $0.87. But the collateral genuinely existed, US regulators stepped in to guarantee SVB deposits, and within days USDC was back at $1. Holders who panic-sold at the bottom locked in a ~13% loss. Holders who understood what backed the token simply waited it out.

USDT — repeated dips toward $0.95. USDT has had several stress episodes over the years (2017, 2018, and during the 2022 market turmoil), trading down to around $0.95 amid recurring fears about Tether's reserves. Each time, the peg recovered — Tether processed billions in redemptions and had the liquidity to meet them.

The takeaway: a depeg is not one thing. Algorithmic depegs have been fatal. Depegs of collateralized stablecoins have, so far, been temporary — the price snapped back once redemptions proved the backing was real. But "so far" is doing real work in that sentence: if an issuer's reserves ever turn out to be materially worse than claimed, there may be no bounce. Treat recovery as the historical pattern, not a law of nature.

What actually makes a stablecoin hold its peg

When you compare stablecoins, four factors explain most of the difference in resilience:

1. What backs it. The gold standard is short-term US Treasury bills and cash: liquid, transparent, and nearly free of market risk, so the issuer can meet redemptions even in a panic. Crypto-collateralized designs (like DAI) are riskier because the collateral itself is volatile, but at least they're overcollateralized — there's more value locked than tokens issued. Purely algorithmic designs sit at the bottom: no real assets, just a mechanism, and mechanisms break under panic.
2. Reserve transparency. Regular third-party attestations are the minimum bar. A full audit is better. If an issuer publishes nothing about its reserves, that is a red flag by itself — you're being asked to trust a promise with no evidence behind it.
3. Regulation of the issuer. An issuer operating under licenses and reserve requirements has less room for unpleasant surprises and more pressure to keep backing honest. Regulation isn't a guarantee, but it narrows the range of what can go wrong quietly.
4. Size and liquidity. A large stablecoin with deep markets across many exchanges weathers panic more easily: there are always arbitrageurs willing to buy from panicking sellers at $0.97 and redeem at $1.00, which itself pulls the price back toward the peg. Small, thinly traded stablecoins can gap down hard on relatively little selling.

How depeg risk connects to yield

Here's the rule that ties this whole topic to your returns: an unusually high rate on an unfamiliar stablecoin is almost always compensation for depeg risk. Markets don't hand out 25% APY for free. If an exotic stablecoin pays dramatically more than USDC or USDT in the same venue, the extra yield is the price of the risk that you wake up holding a token worth $0.60 — or a Terra-style zero.

The pattern is reliable enough to use as a heuristic: the more exotic the stablecoin, the higher the rate — and the higher the risk. That doesn't mean newer stablecoins are scams; many are well-designed. It means the rate alone tells you nothing. When you compare rates on YieldScope, look past the APY number to the token underneath it: what backs it, who issues it, how long it has existed, and how it behaved in past stress.

What to actually do about it

You can't eliminate depeg risk, but you can stop any single depeg from being catastrophic:

• Diversify across 2-3 major stablecoins. If USDC has an SVB-style weekend, your USDT and DAI balances don't care. Splitting a "dollar" balance across issuers is the single cheapest insurance available.
• Keep an eye on issuer reserves. Once a quarter, skim the latest attestation of the stablecoins you hold: what's in the reserves, has the composition shifted toward riskier assets. It takes ten minutes and removes most of the surprise factor.
• Be careful with new high-yield stablecoins. You can take a position, but size it small and only after you understand the mechanism. If you can't explain where the yield comes from, the yield is the payment for a risk you haven't identified yet.

If you're new to stablecoin earning in general, start with our stablecoin yield guide for beginners — it covers the basics this article builds on.

FAQ

Can USDT go to zero?

A total wipeout is unlikely but not impossible. USDT is backed by real assets, and going to zero would require Tether's reserves to be radically worse than reported. The realistic risk is different: a temporary depeg during a panic, which has already happened several times (down to roughly $0.95) and recovered each time. Past recoveries are not a guarantee of future ones — no stablecoin offers that.

What should I do if a stablecoin depegs?

First, figure out why it depegged. If the token is collateralized and the problem is external (like SVB was for USDC), panic-selling at the bottom is often the worst possible move — that's how holders turned a temporary dip into a permanent 13% loss. If the stablecoin is algorithmic or its reserves are genuinely in question, UST's history shows that waiting for a bounce can be fatal. Decide your thresholds in advance: at what price, and on what kind of news, you exit.

Which stablecoin is the safest?

The honest answer: none of them is absolutely safe. Lower-risk profiles belong to large stablecoins backed by T-bills and cash, with regular attestations and a regulated issuer. Judge by the backing, not the marketing — and remember that even the best profile reduces risk rather than removing it.

This is not investment advice. Every stablecoin carries risk; the decisions are yours.