What Is a Stablecoin? How They Work (2026)
A plain-English guide to stablecoins: what they are, the main types (fiat-backed, crypto-collateralized, algorithmic), how they are used, and the real risks like de-pegging and issuer exposure.
Key takeaways
- A stablecoin is a crypto token designed to hold a stable value, usually pegged to a fiat currency like the US dollar, so you can hold or trade dollar value on-chain.
- The main categories are fiat-backed (such as USDC and USDT), crypto-collateralized, and algorithmic, and they differ sharply in how the peg is maintained and how much you have to trust an issuer.
- Stablecoins are widely used as trading collateral, a settlement layer for moving value between markets, and a way to hold dollar-denominated value without leaving crypto.
- Stablecoins carry real risks: a peg can break, an issuer or its reserves can fail, and regulation can change how they operate — algorithmic designs in particular have failed historically.
- In perpetual futures trading, a stablecoin like USDC often acts as the margin and settlement asset, so your collateral and profit and loss are denominated in a dollar-pegged token.
What Is a Stablecoin?
A stablecoin is a cryptocurrency token designed to hold a stable value, usually pegged to a fiat currency like the US dollar. Where assets such as Bitcoin or Ether can swing sharply in price, a stablecoin aims to stay close to a fixed reference — most commonly one US dollar per token.
The goal is simple: let you hold and move dollar value on a blockchain without leaving crypto. That makes stablecoins a bridge between volatile crypto assets and the relative predictability of a fiat currency, and it is why they sit at the center of most trading and settlement activity on-chain.
The Core Idea
Types of Stablecoins
Not all stablecoins work the same way. The differences matter, because they change how the peg is maintained and how much you have to trust a third party. There are three broad categories.
Fiat-Backed
Backed by reserves held by an issuer, such as cash and short-term government debt. USDC and USDT are the most widely used examples. The peg relies on the issuer actually holding sufficient, redeemable reserves.
Crypto-Collateralized
Backed by other crypto assets locked in smart contracts, usually over-collateralized to absorb price swings. This keeps the system on-chain and transparent, but the value of the collateral can itself fall in a downturn.
Algorithmic
Attempts to hold the peg through supply-and-demand rules or incentives rather than full backing. These designs have failed before, sometimes losing their peg completely, and are widely viewed as the riskiest category.
Honesty About Algorithmic Designs
How Stablecoins Are Used
Stablecoins have become one of the most-used building blocks in crypto because they combine dollar-like value with the speed and reach of a blockchain. A few common uses stand out.
- Trading collateral: Traders use stablecoins as the base asset to enter and exit positions, so profit and loss can be measured in stable dollar terms rather than a volatile coin.
- Settlement layer: Because they move on-chain quickly and around the clock, stablecoins are used to shift value between markets, wallets, and venues without waiting on traditional banking hours.
- Holding dollar value: Some people hold stablecoins to step out of volatility while staying in crypto, keeping dollar-denominated value on-chain rather than cashing out to a bank.
On Dexly, once you have moved funds into your own wallet, you can bridge and use a stablecoin as collateral to trade. See deposits, withdrawals, and transfers for how funds move between your wallet and the trading layer.
The Risks
Stablecoins are useful, but they are not risk-free, and it is worth being clear-eyed about what can go wrong. There is no guarantee that a stablecoin always equals one dollar.
- De-peg risk: A stablecoin can trade below or above its target value during market stress or a loss of confidence. Even brief de-pegs can cause losses for anyone holding or trading with the token at the wrong moment.
- Issuer and reserve risk: For fiat-backed coins, you are trusting that the issuer holds real, sufficient, redeemable reserves. If reserves are mismanaged, illiquid, or overstated, the peg and your ability to redeem can be at risk.
- Regulatory risk: Rules governing stablecoins continue to evolve across jurisdictions. Changes can affect how a stablecoin is issued, redeemed, or supported, and can influence which tokens venues choose to list.
Not All Pegs Hold
Stablecoins in Perps Trading
In perpetual futures trading, a stablecoin usually plays a central role as the margin and settlement asset. On the Hyperliquid DEX that Dexly connects to, a dollar-pegged stablecoin like USDC commonly acts as the collateral you post and the unit your profit and loss are measured in.
That means when you open a position, your margin is denominated in a stablecoin, and gains or losses settle in the same token. It keeps your account value readable in dollar terms even while the assets you trade move around. If you are new to this, start with perpetual trading basics.
Where Dexly Fits
The Takeaway
A stablecoin is a crypto token built to hold steady value, most often pegged to the US dollar, and it has become the default way to hold and move dollar-denominated value on-chain. Fiat-backed coins like USDC and USDT dominate, while crypto-collateralized and algorithmic designs take different, riskier paths to the same goal.
They are practical tools, but they carry genuine de-peg, issuer, and regulatory risk, and no stablecoin is guaranteed to always equal a dollar. Understanding how a specific token is backed is the difference between using it wisely and being surprised. When you are ready to put a stablecoin to work as trading collateral, you can open the trading interface and trade from your own wallet.
This article is for educational purposes only and is not investment, financial, or legal advice. Brand names such as USDC and USDT are referenced descriptively and belong to their respective issuers. Facts verified 2026-07-01.
Keep Learning
Risk Warning: Trading perpetual futures involves significant risk of loss. Only trade with capital you can afford to lose. Dexly is a non-custodial interface; you are responsible for your own funds and trading decisions.
Frequently Asked Questions
Trade on Dexly
Perps, spot, copy & prediction markets in one fast, non-custodial app. Get Dexly on iOS & Android and start in seconds.