This is a lesson from charliedesk Classroom, not a news story. The goal is simple: next time you see a token with a name that promises stability, you'll know what to ask.
What does it actually mean that a stablecoin is "backed"?
A stablecoin is a crypto token that tries to hold a fixed value against some asset, most often the US dollar or the euro. The word "backed" means that something real stands behind every token in circulation, so you can theoretically redeem it for what it promises.
There are three basic ways to achieve this, and they differ precisely in what backs the token:
| Type | What backs it | Example of the principle |
|---|---|---|
| Fiat-backed | Real money and short-term bonds held in a bank or with a custodian | Behind 1 token sits 1 dollar (or its equivalent) in an account |
| Crypto-backed | Other cryptocurrencies locked as collateral, usually with a surplus | Behind 1 token of stable value, roughly 1.5 dollars in another asset is locked |
| Algorithmic | Nothing tangible, just a program that changes supply to hold the price | The code "creates" and "burns" tokens based on demand |
The difference between the first and third rows isn't academic. It's the difference between a token backed by assets and a token backed only by trust that the mechanism will hold.
How exactly has a stablecoin failed in the past?
The most famous failure dates to May 2022. A token called TerraUSD (ticker UST) was supposed to hold a value of 1 dollar, but it wasn't backed by money. It held its value algorithmically, paired with another token (LUNA). In simple terms: whenever UST fell below a dollar, the system allowed you to swap one UST for a dollar's worth of value in LUNA, which was meant to push the price back up.
The problem with this arrangement is that it relies on that second token (LUNA) still having value. When a wave of sell-offs began in May 2022 and confidence vanished, the system printed enormous amounts of LUNA to cover UST. That caused LUNA to lose value rapidly, which meant even more had to be printed. This self-accelerating collapse is called a "death spiral." UST permanently broke away from the dollar, and the value people held in this pair largely evaporated within a few days.
The lesson isn't "algorithmic stablecoins are evil." The lesson is more specific: if a stablecoin doesn't have an asset behind it that retains value even in a moment of panic, then its stability holds exactly until the moment you need it most.
What does it mean to "lose the peg" and why does it happen?
The "peg" is the target value the token is meant to hold, usually 1 to 1 against the dollar or euro. To "lose the peg" (in English, depeg) means the token's market price breaks away from that target, say dropping to 0.95 dollars or to a few cents.
A short, temporary deviation of a fraction of a cent happens routinely with traded stablecoins and means nothing on its own. The dangerous situation is when the peg doesn't recover, because the market stopped believing that what the token promises is actually there. Even a stablecoin backed by real money can briefly lose its peg if people doubt the quality of its reserve or whether they'll be able to access their money. The difference is that with a well-backed reserve, there are assets the price can lean on again. With an algorithmic model that has no reserve, that support may not exist.
Why did the EU change which stablecoins you can actually trade?
The European Union introduced a framework for crypto assets known by the abbreviation MiCA (Markets in Crypto-Assets). Its rules for stablecoins took effect in the EU in 2024. We at charliedesk don't give legal advice and the exact wording of the rules is evolving, so take the following as a principle, not as a legal clause.
The basic idea of MiCA for stablecoins is: if you want to offer a token in the EU that promises a steady value, you must have an issuer subject to oversight, and you must hold a real reserve that can be audited. This has two practical consequences you can observe yourself as a user:
- Some stablecoins disappeared from European exchange listings. Exchanges operating in the EU began restricting or removing trading for some tokens and pulling them from availability for European users if their issuer didn't comply with the rules.
- The difference between "looks stable" and "is under supervision" became visible. A token can look perfectly calm on the chart and still be unacceptable for a European exchange because it doesn't meet the requirements on issuer and reserve.
In other words: the EU isn't just judging whether a token holds its price right now, but whether an auditable structure stands behind it. That's a shift from "trust the chart" to "trust what's behind the chart."
So what should you as a reader look at?
These aren't tips on what to do with money. It's a list of questions that make sense for any stablecoin:
- What specifically backs it? Real money and bonds, other crypto, or just a program?
- Who is the issuer and are they subject to any oversight?
- Is the token even available on exchanges operating in the EU, or has it been delisted?
- Is there any form of audit of its reserve that you can verify?
What you can do now and what remains uncertain
After this lesson you should be able to distinguish the three ways of backing a stablecoin, explain in your own words what happened to UST in 2022, describe what losing the peg means, and understand why MiCA changed which tokens are tradable in the EU at all.
What remains uncertain: the exact list of tokens that a specific exchange in a given country allows or removes changes over time, and we don't provide a live status here. A detailed interpretation of individual MiCA provisions is a matter for regulators and their guidance, not this lesson. And no backing, not even the best, is a guarantee: it covers the risk of an asset failing, not the risk of human confidence.
We break down the term stablecoin in more detail in our glossary, which this lesson builds on.