Three stablecoin designs and how each holds value

A stablecoin is a digital token built to hold a steady value, usually against a national currency. Unlike an ordinary crypto asset, whose quoted value moves with demand, a stablecoin comes with a promise to stay put. The promise is only as good as the mechanism behind it, and each design builds that mechanism from different parts. Three designs account for most of the discussion: coins backed by reserves of traditional assets, coins backed by other crypto assets, and coins that rely on an algorithm. They differ in what stands behind the token, who has to be trusted and how they can fail. Knowing which design a coin uses is the first step in understanding why it is stable, and under what conditions it may stop being stable.

The reserve-backed design, often called fiat-backed, is the easiest to picture. A central issuer receives money, issues the same number of coins and is meant to hold reserves such as bank deposits and short-term government debt that match the coins in circulation. Holders expect to redeem a coin for the currency it tracks, which is the right that keeps the price close to its target. Because the reserves are not crypto, this design is shielded from crypto price swings. Its weak point is the issuer. Holders depend on one organization, and the reserves need regular independent audits to show that they exist, that they are what the issuer says and that redemption works when many people ask at once.

The crypto-backed design swaps the bank reserve for crypto collateral locked in a smart contract. Because the collateral itself can drop in quoted value, the system locks up more than the coins it issues, which leaves a cushion. When the cushion gets too thin, the rules sell part of the collateral automatically. This approach is typically more open to inspection and less dependent on a single company, since the rules and balances are visible on the blockchain. The trade-off is stability. A sharp fall in the collateral can strain the cushion, and the automatic selling may itself push the quoted value down further, so such coins tend to be less steady than reserve-backed ones.

The algorithmic design uses no reserves at all. It tries to hold the peg by expanding or shrinking the coin's supply, and it depends on traders who profit from correcting small gaps, usually through a paired volatile token. Imagine a coin whose price slips below its target. The rules reward traders who swap it for the paired token and so remove supply. This works while confidence holds. If belief in the paired token weakens, the reward shrinks, the incentive loses its force and the loop can run in reverse. That is the central weakness. Several well-known designs of this kind lost their peg quickly once confidence left, and holders had no reserve to fall back on.

A few questions apply to any stable-value token. What stands behind it: reserves, crypto collateral or a rule about supply? Who publishes the reserve details, and are they examined by an independent party? What are the written redemption rights, and who is allowed to use them? What happens to the token if its issuer fails or the collateral falls sharply? Is the token's quoted value close to its stated value right now, or has it drifted? Which legal rules in your country cover the issuer? Most of these answers can be found in the issuer's published documents, though the wording is often long, and it pays to read the sections on reserves and redemption first.

Official explanations help here, because they are written by bodies that study how these arrangements fail and what makes them hold up. The International Monetary Fund's 2025 discussion paper explains how reserve makeup, redemption rights and issuer structure shape the risk, and a Bank for International Settlements bulletin describes the algorithmic approach and its limits. Ethereum.org gives a plainer overview of all three designs. None of them rates a specific coin. Rules for issuers differ between countries and are still changing, so check your own financial authority for what applies where you live. This page is general education only. It is not financial, legal or tax advice, and it does not predict how any token will behave.

• Reserve-backed coins depend on one issuer and its audited reserves; the issuer is the weak point
• Crypto-backed coins hold extra collateral, yet a sharp fall in that collateral can strain the peg
• Algorithmic coins hold no reserves, so a loss of confidence can break the peg with nothing to fall back on