New to crypto, you're often comforted with a line: "Worried about how volatile prices are? Just hold a stablecoin — it always equals $1." That line is only half true. Stablecoins are indeed designed to track $1, and most of the time they hug it closely — but "stable by design" and "will never break" are two different things.
In history, some stablecoins briefly drifted off $1 and recovered; others collapsed outright to near zero, wiping out countless people. This article won't scare you — it just makes clear the types of stablecoin, where their stability comes from, and where they can crack, so that when you hold one to park funds, you know exactly what's in your hand.
- A stablecoin is not a dollar — it's "a crypto asset trying hard to track $1," and it can depeg.
- Three types differ fundamentally: fiat-reserve-backed, over-collateralized, and algorithmic, with very different stability and risk.
- UST (algorithmic) collapsed to near zero in 2022; USDC (reserve-backed) briefly depegged during the 2023 SVB crisis, then recovered.
- Treat it as a "relatively stable tool," not a "guaranteed-safe deposit" — don't park large amounts in a single one.
What a stablecoin actually is
A stablecoin is a class of crypto designed to keep its price tracking a fiat currency (most often the U.S. dollar). It exists to solve a pain point: Bitcoin, Ethereum, and the like swing too wildly to be convenient for pricing, transferring, or parking funds — so people created coins where "1 = $1," giving you a relatively stable foothold inside the crypto world.
But hold onto one key fact: a stablecoin is not the dollar itself, and it is not a bank deposit. Whether it can hold $1 depends entirely on what mechanism and what assets are "propping up" that price behind the scenes. Different mechanisms hold the peg with vastly different sturdiness — which brings us to the three types below.
Three types of stablecoin, stable in completely different ways
Don't lump all stablecoins together. Sorted by "what props up the dollar," there are three main kinds:
① Fiat-reserve-backed (the mainstream)
The logic here is the simplest: the issuer claims that for every coin issued, it holds roughly $1 of corresponding reserves somewhere (cash, short-term Treasuries, and so on), so you can in theory redeem 1:1 at any time. USDT (issued by Tether) and USDC (issued by Circle) are this type. Whether it's stable comes down to two things: are the reserves genuinely sufficient, and are the institutions holding them sound? Circle, for instance, publishes monthly reserve attestations for USDC, while Tether's reserve disclosures for USDT have historically drawn more scrutiny — a difference worth knowing.
② Over-collateralized (on-chain collateral)
This type doesn't rely on a centralized institution holding dollars; instead it locks up higher-value crypto assets as collateral and mints the stablecoin on-chain. To issue, say, $100 of the stablecoin, you might first lock $150 or more of crypto as a buffer against the collateral's own price dropping. It's more "decentralized" (DAI is the best-known example) but more mechanically complex, and in extreme markets a crash in the collateral can trigger chain-reaction problems.
③ Algorithmic (the highest risk)
This type has no sufficient real-asset reserves behind it; instead it relies on an algorithm and a paired token's supply-and-demand adjustments to "maintain" the $1 peg. Its most enticing draw is often a high-yield promise, but it's also the most fragile: once market confidence collapses and a run begins, the algorithm can fail in an instant and the price avalanches toward zero. 2022's UST is the painful poster child of this type (detailed below).
Real case: how UST went to zero (May 2022)
In May 2022, the algorithmic stablecoin UST (TerraUSD) suffered one of the most infamous collapses in crypto history. Before that, it held its peg via an algorithmic mechanism linked to its paired token LUNA, alongside a tempting high yield (the Anchor protocol's near-20% return) that pulled in enormous amounts of money.
But when large-scale selling hit and confidence wavered, the mechanism fell into a death spiral: UST's price slipped below $1, the arbitrage mechanism minted vast amounts of the paired token, that token was crushed to collapse, and in turn it dragged UST down further. Within just a few days, UST went to near zero, and LUNA was nearly wiped out too, leaving huge numbers of holders ruined. The episode became the landmark lesson that "an algorithmic stablecoin with no real sufficient reserves can collapse outright in extreme conditions" — and a major catalyst for the regulatory attention stablecoins now draw from the SEC and lawmakers.
Real case: USDC's brief depeg (March 2023)
USDC's experience in March 2023 was completely different from UST. USDC is a fiat-reserve-backed stablecoin, supposed to be backed by sufficient dollar-type reserves. At the time, Silicon Valley Bank (SVB) suffered a run and failed, and Circle, USDC's issuer, disclosed that part of its reserves was held at SVB — sparking market panic over whether that money could be recovered.
The result was a clear but brief depeg, with the price dipping to around $0.87 at one point. But as the deposit arrangements clarified (U.S. regulators ultimately backstopped SVB depositors) and the market confirmed the reserve issue was contained, USDC recovered to near $1 soon after. This episode differs fundamentally from UST: it was a brief deviation under a confidence shock, followed by recovery, not a mechanical, outright collapse.
For the record, as the largest fiat-reserve-backed stablecoin, USDT has also seen brief, minor depegs over the years amid reserve doubts, but has broadly held its peg. The point: even mainstream reserve-backed stablecoins are not "guaranteed never to drift off $1" — they just tend to recover more strongly.
The three types, side by side
| Type | What props up $1 | Stability | Examples / real events |
|---|---|---|---|
| Fiat-reserve-backed | Claims sufficient dollar-type reserves | Relatively most stable, strong recovery | USDT, USDC; USDC ~$0.87 in 2023 then recovered |
| Over-collateralized | Higher-value crypto pledged | Fairly stable but complex | DAI; collateral crashes can chain-react in extremes |
| Algorithmic | An algorithm, no sufficient real reserves | Most fragile, can go to zero | UST collapsed to near zero in May 2022 |
We scrolled through the stablecoin list on a mainstream exchange and counted: "stablecoins" go far beyond USDT and USDC — there's a whole crowd of unfamiliar names claiming a dollar peg. We opened a few of their descriptions and found that the ones that could clearly explain "what the reserves are, who custodies them, whether there's third-party verification" were few; some pages were vague on the mechanism, and a few dangled an enticing fixed annual yield. The browse only firmed up one conviction: "called a stablecoin" is not the same as "actually stable." If a beginner is going to hold a stablecoin to park funds, prefer the large, widely used, relatively transparent mainstream ones — don't get pulled toward an unfamiliar name plus a high yield, which is often the shadow of UST-style risk.
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How a beginner should rationally view "stability"
By now you shouldn't naively treat a stablecoin as a "forever = $1 electronic dollar." What's left are a few practical attitudes. The most fundamental: treat it as a "relatively stable tool," not a "guaranteed-safe deposit" — its stability rests on reserves and confidence, not a free guarantee, and it carries no FDIC insurance. Next, figure out which type you're holding; mainstream fiat-reserve-backed ones are relatively the most stable, so keep your distance from unfamiliar names with murky mechanisms and high yields. Further, don't concentrate large amounts in a single one; not parking big, long-term funds entirely in one stablecoin is a basic way to soften the blow of an unexpected depeg. Finally, be extra wary of any "high-yield stablecoin" — a stablecoin itself shouldn't carry an unreasonable fixed high yield, which is usually a signal of risk.
See these clearly and you won't blindly panic or blindly buy the dip the next time a "stablecoin depeg" headline hits. Before entering, you can also run through the pre-entry readiness checklist to gauge your own grasp of risk.
FAQ
Does a stablecoin really always equal $1?
UST and USDC both depegged — what's the difference?
How should a beginner view a stablecoin's "stability"?
The word "stable" is worth seeing clearly too
To actually park funds for safety, start from a legitimate foothold. Operating mainstream stablecoins inside a large, widely used exchange is far steadier than chasing unfamiliar high-yield names.
Referral code: BN1606
Crypto prices are highly volatile, and stablecoins can depeg too — you could lose principal. This content is for information only and is not investment advice.