To peg an asset is to tie its value to something else and try to keep it there. In crypto the classic example is a stablecoin pegged to the US dollar: the issuer designs it so that one token should always be worth about one dollar, making it useful for pricing trades and moving value without exposure to wild swings. Pegs can also target other currencies, or in some designs a basket of assets.
How a peg is held together varies, and so does how trustworthy it is. Some stablecoins hold real cash and equivalents in reserve, one dollar set aside per token. Others use crypto collateral, and a few rely purely on algorithms adjusting supply. The strength of the peg depends entirely on the quality of that backing and on continued confidence in it.
The crucial honest point is that a peg is a design goal, not a law of nature. When confidence breaks or the backing proves inadequate, an asset can depeg, sometimes catastrophically, as when the algorithmic stablecoin TerraUSD collapsed in 2022. Stable does not mean guaranteed, and the mechanism behind a peg is worth understanding before trusting it. For that reason, understanding exactly what stands behind a peg matters far more than the reassuring word stable printed on the label.
Stablecoins and Their Risks
Key takeaways
- A peg is a target value an asset is engineered to hold, most often a stablecoin tracking one dollar.
- The reliability of a peg depends on how it is backed, by cash reserves, crypto collateral or an algorithm.
- A peg is a design goal, not a guarantee; assets can depeg when backing or confidence fails.
Peg — questions fréquentes
What does it mean when a stablecoin loses its peg?
It means the token's market price has drifted away from its target, such as slipping below one dollar. A depeg can be temporary or, if the backing or confidence fails badly, severe and lasting, as some collapses have shown.
Are all pegs equally safe?
No. A stablecoin fully backed by cash reserves is generally considered sturdier than one relying purely on an algorithm. The peg is only as strong as its backing and the market's confidence in it, so the mechanism matters.
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