A stablecoin is designed to stay around a fixed value, usually $1, but that peg is not guaranteed. TerraUSD (UST) showed why in May 2022, when its dollar peg failed and the Terra ecosystem collapsed within days.
There are four widely recognized types of stablecoins: fiat-backed, crypto-backed, commodity-backed, and algorithmic. What separates them is what actually stands behind the coin when you use it, trade it, or try to redeem it.
This guide explains how each type works, what backs it, and what can go wrong.
The 4 types of stablecoins
What separates the four types of stablecoins isn’t how people use them, but what backs them.
Fiat-backed stablecoins
Fiat-backed stablecoins are backed by traditional currencies such as the US dollar. The issuer holds reserves, usually in cash, bank deposits, or short-term government securities, to support the stablecoins in circulation.
In simple terms, if $1 billion in stablecoins is in circulation, the issuer aims to hold enough qualifying reserves to support that value.
The idea is that when you redeem the stablecoin, the issuer should be able to give you the equivalent amount in real currency. USDT and USDC Â are two well-known examples of fiat-backed stablecoins.
The main risk is whether those reserves actually exist in the quantity and form users expect. In 2021, the US Commodity Futures Trading Commission (CFTC) ordered Tether to pay a $41 million penalty after finding that its claims about USDT being fully backed by US dollars were misleading.
The CFTC found that Tether’s reserves were fully backed by US dollars on only 27.6% of the days in a sample covering 2016 to 2018.
Even with reserves, a stablecoin can temporarily lose its peg. USDC experienced this in March 2023 after Circle disclosed that $3.3 billion of its reserves were held at Silicon Valley Bank, which had been shut down by regulators. The reserve represented about 8% of USDC’s total reserves at the time.
Crypto-backed stablecoins
Crypto-backed stablecoins use other cryptocurrencies as collateral instead of relying mainly on cash or government securities.
The smart contract locks the collateral and automatically enforces the agreed rules. The system usually requires users to deposit more collateral than the stablecoins they mint.
For instance, you may lock roughly $150 worth of crypto to mint $100 worth of stablecoins. This setup is known as over-collateralization.
DAI is the standard example of this model.
The trade-off here is that the collateral itself can be volatile. A sharp crypto market crash can push collateral below the required level and trigger forced liquidations.
These systems can also reduce reliance on a single company, but that does not mean they are risk-free. If a smart contract, governance system, or collateral mechanism fails, no central company may be able to step in and fix the problem.
Commodity-backed stablecoins
Commodity-backed stablecoins are tied to physical assets, most commonly gold. Instead of trying to keep the token worth exactly $1, the token represents a specific amount of a commodity held by a custodian.
PAX Gold (PAXG), for example, represents one fine troy ounce of physical gold stored in professional vaults in London. Tether Gold (XAUt) similarly represents one troy fine ounce of gold on a London Good Delivery bar.
This makes commodity-backed stablecoins different from dollar-backed coins. Their value can rise or fall with the underlying commodity’s price.
Redemption for physical assets may involve meeting the issuer’s minimum redemption amount, verification requirements, or other conditions, while buying and selling may have less market liquidity than dollar-backed stablecoins like USDT or USDC.
It is therefore more accurate to think of these tokens as digitized gold ownership than digital cash.
Algorithmic stablecoins
Algorithmic stablecoins attempt to maintain their price without traditional reserves such as dollars, bonds, or physical gold. Instead, an algorithm automatically changes the token’s supply, or uses another token and market incentives, to try to keep the price stable.
The problem is what happens when confidence disappears. If people start selling heavily, the mechanism designed to restore the peg can actually make the situation worse. Falling prices can trigger more selling, creating more pressure on the system and potentially producing a death spiral.
TerraUSD (UST) is the clearest example. In May 2022, UST collapsed from its $1 target to around $0.10 within a week, while the combined market value of UST and LUNA fell by almost $45 billion.
Algorithmic stablecoins have not disappeared, however. USDD, launched on TRON in 2022, is still trading. CoinMarketCap lists its market cap at about $1.52 billion as of September 16, 2026.
The important point is that the category still exists, but its design creates a much greater dependence on market confidence and the mechanism itself. For someone looking to hold savings, that makes algorithmic stablecoins the riskiest category.
List of Stablecoins you should know
As of September 16, 2026, CoinMarketCap’s stablecoin data puts the overall market at about $314.5 billion. The largest stablecoins by market capitalization at the time of writing include USDT, USDC, USDe, DAI, and USD1.
Fiat-backed stablecoinsÂ
- USDT: The largest stablecoin by market capitalization, with about $183.4 billion in circulation as of September 16, 2026. It is designed to track the U.S. dollar.
- USDC: Issued by Circle and designed to maintain a 1:1 value with the U.S. dollar. According to Circle, its reserves consist of cash and short-duration U.S. Treasury assets.
- USD1: Issued by World Liberty Financial and among the largest dollar stablecoins by market capitalization, at about $4.32 billion.
- USDG: Another newer dollar-backed stablecoin, with a market capitalization of about $3.28 billion as of September 16, 2026.
- RLUSD: Ripple’s dollar-backed stablecoin, designed to be redeemable 1:1 and backed by segregated cash and cash equivalents.
Crypto-backed stablecoinsÂ
- DAI: A decentralized stablecoin whose system uses crypto collateral and smart contracts to maintain its dollar peg. As of September 16, 2026, CoinMarketCap puts its market capitalization at about $4.57 billion.
Commodity-backed stablecoins
- Pax Gold (PAXG): Represents one fine troy ounce of physical gold held in custody by Paxos.
- Tether Gold (XAUt): Represents one fine troy ounce of physical gold.
Algorithmic stablecoinsÂ
- USDD: An actively traded stablecoin with a market capitalization of about $1.52 billion as of September 16, 2026. The stablecoin issuer describes it as a crypto-collateralized, over-collateralized stablecoin.
Why do people use Stablecoins?
Three real jobs stablecoins do that regular crypto and regular banking both struggle with:
Cross-border payments
Stablecoins can move across blockchain networks without waiting for traditional banking rails to process an international transfer. This makes stablecoins useful for cross-border payments.Â
Trading and profit preservation
Crypto traders can move gains from volatile assets into a dollar-pegged stablecoin without immediately converting back to fiat. The funds remain within the crypto ecosystem while reducing exposure to Bitcoin or altcoin price swings.
Access to decentralized finance (DeFi)
Stablecoins serve as base assets for lending, borrowing, liquidity provision, and other decentralized finance applications.
For someone using crypto in Nigeria or Ghana, stablecoins also offer a practical cash-out use case. Dollar stablecoins such as USDT and USDC can serve as a digital representation of dollar value before you convert them into local currency.
The key distinction is that a stablecoin is not risk-free. How a coin maintains its peg determines the type of risk you take.
Frequently Asked Questions
What is a stablecoin?
A stablecoin is a cryptocurrency or digital token designed to maintain a relatively stable value against another asset, most commonly the U.S. dollar. Different stablecoins use different mechanisms to achieve this, including fiat reserves, cryptocurrency collateral, physical commodities, or algorithms.
Is Bitcoin a stablecoin?
No. Bitcoin is not a stablecoin. Bitcoin has no fixed peg to the U.S. dollar or another asset and has no mechanism designed to keep its price at a specific level. Supply and demand determine its market price.
Is XRP a stablecoin?
No. XRP is not a stablecoin. It is the native cryptocurrency of the XRP Ledger, and its market price fluctuates according to supply and demand. Ripple describes XRP as a bridge asset for transactions across different currencies.
What’s the safest stablecoin?
There is no stablecoin that is completely risk-free. A useful way to assess relative safety is to look at what backs the coin, how transparent its reserves are, whether those reserves are independently attested, how redemption works, and whether the stablecoin has survived a period of serious market stress.
What are the top 5 stablecoins right now?
Based on CoinMarketCap data checked on September 16, 2026, the five largest stablecoins by market capitalization are: USDT, USDC, USDe, DAI, and USD1. Stablecoin rankings can change as circulating supply changes.
Who issues the most stablecoins?
Tether is the largest individual stablecoin issuer through USDT. At the time of writing, CoinMarketCap lists USDT at about $183.4 billion and USDC at about $74.2 billion. Together, those two stablecoins account for roughly 82% of the $314.5 billion stablecoin market based on the same current snapshot.
How much is one stablecoin actually worth?
A stablecoin maintains the value of the asset it is pegged to. For a U.S. dollar stablecoin, the target is normally $1. But $1 is a target, not a guarantee that the token will trade at exactly $1 every second.
