Crypto 101 Daily

A stablecoin is supposed to stay worth about a dollar — that’s its whole job. So when one slips to 95 cents, or collapses toward zero, something has gone wrong. That event is called a “depeg,” and understanding it is key to grasping the real risk hiding inside “stable” coins. Here’s the plain-language guide.

What a depeg is

A stablecoin is designed to hold a steady value — its “peg” — usually one unit equalling one dollar. A depeg is when the stablecoin loses that peg and trades meaningfully away from its target, for example dropping to $0.95 or far lower. A small, brief wobble can be minor; a serious depeg means the coin is no longer reliably worth what it promises, which can be alarming or even catastrophic.

Why a stablecoin can lose its peg

The peg isn’t magic — it depends on the coin genuinely being backed or managed well. Depegs happen when confidence in that breaks. Common triggers include: doubts about whether the issuer really holds enough quality reserves to back every coin; a rush of people trying to redeem or sell at once (a “run”) that overwhelms the system; the failure of whatever mechanism is supposed to hold the peg; or broader panic spilling over from elsewhere in crypto. In short, a stablecoin holds its peg only as long as people trust they can always get a dollar back — and trust can evaporate fast.

The cautionary tale

The most dramatic example was an “algorithmic” stablecoin that, in 2022, tried to maintain its peg through a clever mechanism rather than solid reserves. When confidence cracked, it entered a downward spiral and collapsed to near zero in days, erasing enormous sums. It’s the clearest warning that “stable” is a design goal, not a guarantee — and that poorly-backed or purely algorithmic stablecoins can fail spectacularly.

What it means for a beginner

A few practical lessons. Don’t assume any stablecoin is risk-free just because it’s called “stable” — the peg can break. Favour large, well-established stablecoins that are transparent about holding real, high-quality reserves, and be wary of obscure ones or any offering suspiciously high yields for holding them. Understand that even a temporary depeg can cause losses if you sell in a panic at the wrong moment. The whole point of a stablecoin is reliability, so its biggest risk is precisely that the reliability fails. This is education, not financial advice.

Key takeaways

A depeg is when a stablecoin loses its target value (usually $1) and trades meaningfully below or above it. It happens when confidence in the coin’s backing breaks — from reserve doubts, redemption runs, failed peg mechanisms, or wider panic. A 2022 algorithmic-stablecoin collapse showed how catastrophic it can be. “Stable” is a goal, not a guarantee, so favour large, transparent, well-reserved stablecoins, distrust high yields, and don’t assume the peg can never break. This is education, not financial advice.

New here? This is the key risk behind whether stablecoins are safe and builds on what a stablecoin is. It also connects to why crypto is so volatile.