Stablecoins Explained: How a Token Tries to Stay Worth One Dollar

A Bitcoin price can move sharply because nothing in the system promises that one bitcoin should be worth a particular number of dollars. A dollar stablecoin starts with a very different idea: one token should remain worth approximately $1.

That sounds simple until you ask the obvious question: what actually keeps it there?

A stablecoin is still a crypto token. People can buy and sell it on exchanges, move it between wallets and use it inside decentralized finance. Its market price therefore comes from buyers and sellers, just like the price of other tradable assets.

The difference is that a stablecoin has a mechanism designed to keep its market price close to a reference value. Depending on the design, that mechanism can involve cash reserves, crypto collateral, redemptions, liquidations or economic incentives.

The easiest way to understand stablecoins is not to think of $1 as a price programmed into the token. Think of it as a target that the surrounding system tries to defend.

A peg is a target, not a fixed price

Suppose a dollar stablecoin trades for $0.999 or $1.001 on an exchange. That does not necessarily mean anything is wrong.

The exchange price is determined by a market. Buyers submit bids, sellers submit offers and available liquidity changes continuously. Different trading venues can even show slightly different prices at the same moment.

The stablecoin’s peg is the reference value it is designed to track. Its market price is what buyers and sellers are currently willing to pay.

A functioning stabilization mechanism tries to keep those two values close together.

The simplest model: dollars behind tokens

Consider a simplified reserve-backed stablecoin.

A customer provides $1 to an issuer. The issuer creates one stablecoin and holds assets corresponding to that dollar in reserve. Later, an eligible customer can return the token to the issuer and receive $1 back. The redeemed token is then removed from circulation.

The simplified cycle looks like this:

$1 enters → 1 stablecoin is issued → the token circulates → the token is redeemed → $1 leaves.

USDC is one example of this general model. Circle states that USDC is backed by highly liquid cash and cash-equivalent assets and is redeemable 1:1 for U.S. dollars for eligible customers, subject to its terms.

Circle also publishes information about the assets supporting USDC. According to its transparency disclosures, reserves include assets such as cash, short-dated U.S. Treasuries and overnight U.S. Treasury repurchase agreements held through the Circle Reserve Fund and other approved arrangements.

How redemption can pull the price back toward $1

Now imagine a redeemable stablecoin falls to $0.98 on a secondary market.

In a simplified example, an eligible participant could buy 1,000 tokens for $980 and redeem them with the issuer for $1,000. Ignoring fees, settlement delays and other costs, the difference creates a potential arbitrage opportunity.

That opportunity encourages market participants to buy the discounted stablecoin. Increased buying pressure can push its price upward toward $1.

The reverse can happen when the token trades above $1.

Suppose the market price reaches $1.02. If an eligible participant can provide dollars to the issuer, receive new stablecoins at the reference value and sell them at the higher market price, there is an incentive to increase supply.

Additional selling pressure can then push the market price back down.

The important point is that an issuer does not need to force every exchange to display exactly $1.

Instead, the system can create economic incentives that make large deviations from the target attractive for traders to correct.

Can everyone redeem a stablecoin directly?

Not necessarily.

This is one detail that simplified explanations often miss.

Circle Mint, for example, is designed for qualifying businesses and institutions. Retail users do not automatically have the same direct relationship with the issuer.

A retail holder may instead buy or sell USDC through an exchange, wallet provider or another intermediary.

That does not mean the redemption mechanism is irrelevant to retail markets. Professional trading firms, exchanges and market makers can connect primary issuance and redemption with secondary-market trading.

If a stablecoin becomes cheap on one venue, participants with access to redemption may have an incentive to buy it. Their activity can transmit the value of the issuer’s redemption promise into broader markets.

Not every stablecoin is backed by bank reserves

Reserve-backed stablecoins are only one model.

Some stablecoins use crypto assets as collateral. Instead of an issuer holding dollars or Treasury assets, users lock crypto inside smart contracts and create stablecoins against that collateral.

This creates a new problem: crypto collateral can fall sharply in value.

Protocols therefore often require positions to be overcollateralized. A user may need to lock collateral worth more than the stablecoins they create.

If the value of the collateral falls too far, the protocol can liquidate the position according to predefined rules.

Liquity’s BOLD provides one example of a crypto-backed design. Its documentation describes a system in which BOLD can be redeemed against protocol collateral, while borrower-set interest rates and redemption mechanics contribute to the system’s peg incentives.

The machinery is different from a reserve-backed stablecoin, but the underlying idea is similar: there must be an economic reason for the market price to return toward the target.

Reserve-backed vs crypto-collateralized stablecoins

Neither design eliminates risk. It changes where the risk is located.

Why the quality of reserves matters

Imagine an issuer has $10 billion of stablecoins outstanding and reports $10 billion of assets in reserve.

That number alone does not tell you everything you need to know.

The next question is: what are those assets?

$10 billion of cash and short-term government securities is not economically identical to $10 billion of illiquid loans, volatile investments or assets exposed to significant credit risk.

Liquidity matters because stablecoin holders may want to redeem quickly, particularly during periods of uncertainty.

International banking standards also distinguish between the nominal amount of backing and the quality, liquidity and credit characteristics of reserve assets.

When evaluating the structure of a reserve-backed stablecoin, useful questions include:

• What assets are held in reserve?
• Who holds those assets?
• How liquid are they?
• How frequently is the reserve composition disclosed?
• Who is legally entitled to redeem directly?
• What happens if many holders request redemption at once?

The phrase fully backed is useful information, but it is not a complete risk assessment.

How can a stablecoin lose its peg?

A stablecoin can move away from $1 when the market begins to doubt the mechanism that is supposed to return it there.

Reserve risk

If reserve assets lose value, become inaccessible or cannot be sold when needed, holders may question whether all tokens can still be redeemed at the target value.

Liquidity risk

A system can have assets whose total value appears sufficient while still struggling to produce cash quickly enough to meet heavy redemption demand.

Counterparty and custody risk

Reserve-backed stablecoins rely on institutions outside the blockchain, including banks, custodians and asset managers. Problems at those institutions can affect access to reserves.

Smart-contract risk

Crypto-backed stablecoins depend on software. A vulnerability or unexpected contract behavior can interfere with collateral management, redemptions or liquidations.

Oracle risk

Many decentralized systems need external price data to determine how much collateral is worth. Incorrect or manipulated price information can cause the protocol to make incorrect decisions.

Liquidation risk

If collateral prices fall faster than a protocol can liquidate unhealthy positions, the value supporting the stablecoin may become insufficient.

Confidence and run risk

Stablecoins can also face self-reinforcing pressure.

Some holders become worried and try to exit. Heavy selling or redemption demand pushes the token further from its target. That deviation worries additional holders, who may also try to leave.

International financial authorities have identified this kind of confidence feedback loop as a potential source of stablecoin run risk.

Does every depeg mean the stablecoin has failed?

No.

A token trading at $0.99 does not tell you, by itself, whether the underlying system is broken.

A small deviation might result from temporary liquidity conditions, transaction costs, settlement delays or a problem isolated to one trading venue.

A more serious deviation can reflect doubts about reserves, collateral or redemption.

That is why the useful question is not simply:

“Is the price exactly $1?”

The better question is:

That question works across very different stablecoin designs.

Why stablecoins are useful

Stablecoins combine two properties that do not naturally come together.

They can move across blockchain networks like crypto assets while attempting to use a familiar unit of account such as the U.S. dollar.

That makes them useful for several purposes:

• moving dollar-denominated value between crypto wallets;
• settling transactions on blockchain networks;
• providing trading pairs on crypto markets;
• serving as collateral in decentralized finance;
• making certain kinds of crypto payments;
• holding a less volatile unit of account than many other crypto assets.

But a dollar-denominated token is not automatically the same thing as physical dollars or money held in a bank account.

Its properties depend on the issuer or protocol, reserve structure, redemption rights, smart contracts, blockchain network and surrounding financial infrastructure.

How to think about any stablecoin

You do not need to memorize every stablecoin design. A small set of questions can help you understand most of them.

So when someone says a stablecoin “is worth a dollar,” mentally add one more question: why?

The answer—reserves, redemption rights, collateral, arbitrage, protocol incentives or some combination of them—is what actually explains how the stablecoin works and where its risks come from.