Stablecoins explained in one sentence: they are crypto tokens designed to hold a steady value, usually one dollar, so people can trade, pay and move money between exchanges without the price swings of bitcoin or ether. That steadiness is the whole selling point, and it is also the thing to be sceptical about. A peg is a promise about value, not a guarantee of price. When the peg works, one token trades near $1 and can be treated as roughly $1 for practical purposes. When it fails, it can fail fast, and the reasons it fails are built into how each type of stablecoin is designed.
Stablecoins Explained: The Three Types of Peg
Fiat-backed stablecoins are the most widely used type. An issuer holds reserves, usually cash, Treasury bills and money market funds, and promises to redeem each token for $1 on demand. USDT and USDC are the best-known examples. The mechanism is simple: you deposit $100, you receive 100 tokens; you redeem 100 tokens, you receive $100. That simplicity is also the risk: you must trust a single issuer to hold the reserves, to hold them in safe assets, to redeem promptly, and not to freeze accounts. Reserve transparency varies: USDC’s issuer publishes monthly attestations, USDT’s quarterly, and both have faced scrutiny over disclosure.
Crypto-collateralised stablecoins work differently. Instead of a company holding dollars, a protocol holds other crypto as collateral in smart contracts, over-collateralised to absorb price moves: typically 150% or more, so minting $1,000 of stablecoins requires locking at least $1,500 of crypto such as ETH. If the collateral value falls below a safety threshold, the protocol automatically liquidates enough of it to protect the peg. DAI is the best-known example of this design. It removes single-company trust, but adds smart-contract risk and liquidation risk: in a fast crash, liquidations can cascade.
Algorithmic stablecoins hold no collateral at all. They maintain the peg with code and incentives, usually a two-token arbitrage loop: when the stablecoin trades above $1, the system mints more of it; when it trades below, it burns supply or mints the sister token to absorb the difference. This is the riskiest design, and it has the worst record. TerraUSD collapsed from $1.00 to about $0.01 in May 2022, in a reflexive death spiral: as confidence slipped, the sister token had to absorb more losses, its price fell, its ability to back the stablecoin weakened further, and both tokens collapsed to near zero within days. An algorithmic peg is not backed by anything that can be redeemed in a panic, and that is the difference that matters.
How Pegs Break: De-Pegs, Runs and Redemption
A stablecoin can lose its peg even when it is backed, because a peg depends on two things at once: reserves that are actually there, and market participants willing to arbitrage small price deviations back to $1. When either fails, the peg slips. The Federal Reserve’s own warning on this point is blunt: a stablecoin will be stable only if it can be reliably and promptly redeemed at par in a wide range of conditions, including market stress that puts pressure on otherwise liquid government debt, and strain on the individual issuer. Reserve quality and liquidity are therefore critical, and issuers have an incentive to stretch for yield on reserves in good times, which risks undermining confidence exactly when it is needed most.
USDC’s March 2023 episode is the instructive case. During the Silicon Valley Bank crisis, USDC fell to about $0.87, because part of its reserves sat at that bank, before recovering once the banking stress eased and redemption confidence returned. It recovered; TerraUSD did not, because there were no reserves to recover with. The lesson: “pegged” and “risk-free” are different claims, and only the reserves, the redemption mechanism and the issuer’s transparency tell you which one you are looking at.
There is a further difference from a bank account that beginners often miss: no stablecoin carries deposit insurance like a bank account. If the issuer fails, or the reserves prove insufficient, there is no FDIC-style backstop paying you back. That is why a stablecoin is a poor home for a multi-year emergency fund, however stable its price looks in calm markets. Use insured savings for money you cannot afford to lose, and treat stablecoins as what they are: useful plumbing for crypto trading and settlement, not a savings account.
What Stablecoins Are Actually Used For, and What to Check
In practice, stablecoins are the fuel for most crypto trading: traders hold them between trades to avoid converting back to dollars, and they move value cheaply between exchanges and networks. Adoption has also grown in payments and remittances in some markets, and as a dollar-denominated store of value in countries where the local currency is unstable. Those uses are real, but a stablecoin is still a private token, not central-bank currency, and its redemption rights depend on the issuer and jurisdiction.
Before holding any material amount, check four things. First, what backs it: fiat reserves, crypto collateral, or nothing but code. Second, how redemption works: who can redeem, how fast, and whether redemption has ever been paused. Third, what the attestations actually say: how often they are published, who signs them, and whether reserves are cash and Treasuries or riskier assets. Fourth, where you hold it: an exchange adds platform risk, while self-custody makes you solely responsible for the keys. Our guide on crypto wallets: hot vs cold storage explains that custody choice, at the point where holding any crypto, stable or not, raises the same key question. That post is scheduled for 7 November 2026, so it will be live before this article publishes.
Two more warnings belong in any honest guide. Yield on stablecoins, offered through lending or DeFi protocols, compensates you for counterparty and smart-contract risk; it is not comparable to interest on an insured savings account, and a high stablecoin yield usually means high hidden risk. And tax does not disappear at a $1 peg: trading gains and losses on stablecoins are still reportable, and the peg does not remove the need to track them. For the wider crypto picture, our guide on what DeFi is in crypto explains the decentralised applications many stablecoins circulate inside, and our guide on what staking is in crypto covers the other main way crypto holders chase yield, with its own risks. That post is scheduled for 9 November 2026, so it will be live before this article publishes.
Frequently Asked Questions
Are stablecoins the same as digital dollars?
No. They are pegged to the dollar but issued by private issuers, not central banks, and are not guaranteed or insured like bank deposits.
Can a stablecoin lose its $1 peg?
Yes. TerraUSD collapsed to about $0.01 in May 2022, and USDC fell to about $0.87 during the March 2023 banking stress before recovering. A peg depends on reserves, redemption and market confidence, and all three can fail.
Are fiat-backed stablecoins safer than algorithmic ones?
Generally, yes, because fiat-backed coins hold real reserves that can be redeemed, while algorithmic coins hold no collateral and rely on incentives that can spiral. But fiat-backed coins still carry issuer, reserve-quality and freeze risks, and they are not insured.
Is yield on stablecoins like bank interest?
No. Stablecoin yield compensates you for counterparty and smart-contract risk. It is not comparable to interest on an FDIC-insured savings account, and a high yield usually signals high hidden risk.
Should I keep my emergency fund in stablecoins?
No. Use an insured savings account for money you cannot afford to lose. A stablecoin has no deposit insurance, and a de-peg during a crisis is exactly when you would need the money most. The Federal Reserve’s remarks on stablecoins make the same core point: stablecoins will be stable only if they can be reliably and promptly redeemed at par, including during market stress, and reserve quality and liquidity are critical to that.
Disclaimer: This article is for general educational purposes only, not personalised financial, investment, tax, or legal advice, and it does not recommend any crypto asset, stablecoin, issuer or platform. Crypto assets are volatile, can lose value, and are subject to changing regulation and scam risk. Research issuers and reserves carefully and never share a private key or seed phrase.
