What is a stablecoin?
Learn what a stablecoin is, how fiat-backed, crypto-backed, and algorithmic designs try to hold a peg, and which risks a stable price does not remove.
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Quick read
A stablecoin is a token that tries to hold a steady value against a reference such as the US dollar. This lesson explains the three main ways designs attempt that, why the peg is a claim rather than a property of the token, and which issuer, network, and redemption risks a stable price does not remove.
What to remember
- A stablecoin holds its value because something backs or defends the peg — the token itself has no built-in stability.
- Fiat-backed, crypto-collateralized, and algorithmic designs fail in different ways, so the design tells you what to watch.
- A stablecoin is still a token on a network, so it needs that network's native asset for fees and exists separately on each chain.
- A steady price does not remove issuer, reserve, redemption, or freeze risk — it only hides them while the peg holds.
Why would anyone want a crypto asset that does not move?
Most of this path has been about assets whose price is expected to move. Bitcoin's supply rules and Ethereum's fee market both produce assets that markets reprice constantly. That is useful for someone taking a position, and awkward for almost everything else: pricing goods, holding value between trades, or moving money without taking a directional bet.
A is the response. It is a token whose design goal is to track a reference value — overwhelmingly the US dollar — closely enough that a holder can treat one unit as one dollar. That goal is what makes it useful for settlement and for sitting out volatility without leaving the network.
The critical word is goal. Nothing about being a token makes a price stable. Stability has to be produced by something, and the something is different in each design.
How does a stablecoin actually hold its value?
Three broad approaches dominate, and they are worth telling apart because they break in unrelated ways.
| Design | What backs the peg | What holds it in place | How it typically fails |
|---|---|---|---|
| Fiat-backed | Reserves the issuer says it holds — cash and short-term instruments. | Redemption: approved parties can exchange tokens with the issuer, and arbitrage pulls the market price back. | The reserves are not what was claimed, or redemption is restricted exactly when it is needed. |
| Crypto-collateralized | Other crypto assets locked in contracts, deliberately worth more than the tokens issued. | Overcollateralization plus liquidation of positions that fall below a required ratio. | Collateral falls faster than positions can be liquidated, leaving debt without backing. |
| Algorithmic | No reserve of comparable value — supply is expanded and contracted by rules. | Incentives that are supposed to make traders push the price back toward the peg. | Confidence goes, the incentive stops attracting anyone, and the mechanism accelerates the fall. |
Read that last column as the point of the table. A fiat-backed stablecoin asks you to trust an institution and its disclosures. A crypto-collateralized one asks you to trust that its liquidation machinery works during exactly the market conditions that stress it. An algorithmic one asks you to trust that other people will keep believing in it — which is why algorithmic designs have the worst historical record. The most prominent collapse, TerraUSD in May 2022, went from trading near a dollar to near zero within days, and the mechanism meant to defend the peg accelerated the failure instead of arresting it.
What does a stablecoin inherit from being a token?
A stablecoin is not a separate network. It is a smart contract's record on a network it does not own, which means everything from the token lesson applies unchanged.
Three consequences matter in practice:
- You need the network's native asset to move it. Sending a stablecoin on Ethereum costs ETH in gas, no matter that the token itself is dollar-priced. Holding only stablecoins can leave you unable to move them.
- The same stablecoin exists separately on each network. A dollar stablecoin issued on Ethereum and the version on another chain are different contracts. Sending to an address on the wrong network is a common and frequently unrecoverable mistake.
- The contract address identifies it, not the name. A ticker that looks like a well-known stablecoin proves nothing. Anyone can deploy a token and label it.
What risks does a stable price hide?
This is the part a steady chart obscures. A stablecoin trading at exactly its reference value tells you the peg is holding right now. It says nothing about the conditions underneath it.
- Issuer risk. For a fiat-backed stablecoin, you hold a claim on a company. If that company's reserves, solvency, or banking relationships fail, the token's backing fails with it.
- Reserve quality. "Backed" is a spectrum. Reserves held in cash and short-dated government instruments behave very differently under stress from reserves in longer-dated or less liquid assets.
- Redemption access. Direct redemption with an issuer is usually available only to approved institutional counterparties, not to individual holders. Most people can exit only by selling on a market — which is precisely where the price may have already moved.
- Freeze and blacklist powers. Centrally issued stablecoins commonly include the ability for the issuer to freeze balances or block addresses. This is a deliberate compliance feature, and it means the asset is not censorship-resistant in the way a network's native asset is.
- Regulatory change. Several jurisdictions have introduced or are introducing rules covering issuance, reserves, and disclosure. These can change which stablecoins a platform will support in your region.
How is a stablecoin different from Bitcoin?
The two are near-opposites in intent, which is why comparing them on price movement alone misses the point.
| Question | Bitcoin | A dollar stablecoin |
|---|---|---|
| What is it trying to do? | Exist as a scarce asset settled by its own network. | Track the value of something else, usually the US dollar. |
| Where do its rules come from? | Bitcoin's protocol rules, validated by its participants. | A smart contract, plus whatever the issuer or collateral system does. |
| Who can change or block a holding? | No operator can reverse or freeze a valid transfer. | A central issuer typically can freeze balances or blacklist addresses. |
| What is the main risk? | The price can move sharply in either direction. | The peg or the issuer behind it fails, while the price looks calm until it does. |
Neither column is the safer one in general. They carry different risks, and a stablecoin's risk is simply less visible day to day — which is exactly why it is worth understanding before you rely on one.
Conclusion
A stablecoin is a token that tries to track a reference value, and the whole subject reduces to one question: what is doing the trying? Fiat-backed designs depend on an issuer holding real reserves and honoring redemption. Crypto-collateralized designs depend on excess collateral and liquidations that work under stress. Algorithmic designs depend on continued confidence, which is why they have failed most often and most completely.
Because a stablecoin is a token rather than a network, it carries every token property from the previous lesson: it needs the host network's native asset for fees, it exists as a separate contract on each chain it is issued on, and only its contract address identifies it. Those are the mistakes that cost people funds in ordinary conditions, independent of whether the peg holds.
The risks a stable price conceals are the ones worth carrying forward. Holding a fiat-backed stablecoin means holding a claim on a company, usually without direct redemption rights, on an asset the issuer can typically freeze. None of that is visible in a chart sitting flat at one dollar. Judge the issuer and the design rather than the ticker, keep enough native asset to move your funds, and treat "stable" as a description of intent rather than a guarantee of outcome.
If you want the next question — where these assets are actually held, and who controls them — continue to Who actually holds your crypto?.
Frequently asked questions
A token designed to hold a steady value against a reference, almost always the US dollar, so that one unit can be treated as roughly one dollar. Unlike Bitcoin or ETH, it is not intended to appreciate — its purpose is to stay level, which makes it useful for settling payments and holding value between trades.
Through one of three mechanisms. Fiat-backed stablecoins rely on an issuer holding reserves and allowing approved parties to redeem tokens, which lets arbitrage pull the market price back. Crypto-collateralized ones lock up more crypto value than they issue and liquidate positions that fall below a required ratio. Algorithmic ones expand and contract supply by rule, with no comparable reserve behind them.
They remove price volatility, not risk. Depending on the design you are exposed to the issuer's solvency and reserve quality, to liquidation machinery working during stress, or to confidence in an algorithm. A stable price makes these risks less visible day to day, which is not the same as their being absent.
Yes, and several have. A depeg happens when the market price moves away from the reference value, either temporarily under stress or permanently when the backing fails. The most prominent permanent failure was TerraUSD in May 2022, an algorithmic design that fell from near a dollar to near zero within days.
They are built for opposite purposes. Bitcoin is a scarce asset settled by its own network, with a price that moves and no operator able to freeze a valid transfer. A dollar stablecoin is a token that tracks something else, typically issued by a company that can usually freeze balances. Bitcoin's main risk is price movement; a stablecoin's is the peg or the issuer behind it.
Yes. A stablecoin on Ethereum is an ordinary token, and moving it is an Ethereum transaction paid for in ETH. Holding a dollar-denominated balance with no ETH means you cannot move it, which is a common and avoidable way to get stuck.
No. The same issuer's stablecoin on different networks is a different contract on each. They are usually intended to be worth the same, but they are not interchangeable at the address level, and sending to an address on the wrong network is a frequent and often unrecoverable mistake.
For centrally issued stablecoins, typically yes. Freeze and blacklist functions are commonly built in as a compliance feature, allowing an issuer to block specific addresses or balances. This is a genuine difference from a network's native asset, where no operator has that ability.
Usually not as an individual. Direct redemption with the issuer is generally restricted to approved institutional counterparties, so most holders can only exit by selling on a market. That distinction matters during stress, because the market price is exactly what moves when confidence in the backing drops.
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Keep learning
Recommended next reads based on this lesson.
- Why are there so many tokens?Learn how ERC-20 made tokens reusable across Ethereum apps, and why a shared standard still leaves important risks.
- Who actually holds your crypto?Learn what a crypto wallet really stores, the difference between custodial and self-custody holdings, and what each arrangement means when something goes wrong.
- Where do Ethereum rollups execute and settle?Learn how Ethereum rollups execute transactions away from Mainnet, submit batches and data back to Layer 1, and differ from sidechains and bridges.
- Why do blockchains get congested?Learn why shared Layer 1 resources are limited, how demand turns into fees and delays, and why scaling creates trade-offs.
