Stablecoins are crypto tokens designed to hold a steady value, usually one US dollar. They stay stable in three ways: real-dollar reserves, locked crypto collateral, or, less safely, an algorithm. This guide explains how USDC, USDT, and DAI keep their peg, and what "native versus bridged" means when you move them.
What makes a stablecoin actually stable?
A stablecoin holds its value through whatever sits behind it. There are three models: backed by real dollars, backed by crypto collateral, or balanced by an algorithm. The backing is the whole story, because a token is only as stable as the thing promising to honor it. Most of the dollars moving through Ethereum use the first two models.
The three approaches differ sharply in how much you have to trust, and a table makes the split clear.
Backing model | How the peg holds | Example |
|---|---|---|
Fiat-backed | A company holds real dollars and Treasuries, one per token | USDC, USDT |
Crypto-collateralized | Users lock crypto worth more than the tokens minted | DAI, USDS |
Algorithmic | Code adjusts supply to chase the peg, with no hard reserve | Largely abandoned after 2022 |
The first two dominate for a reason. Fiat-backed coins are simple to understand: a dollar in a bank for every token issued. Crypto-collateralized coins are fully on-chain, with no company holding reserves, relying instead on overcollateralized vaults. The third model, algorithmic, tried to hold a peg with clever supply rules and minimal backing. It collapsed spectacularly in May 2022, when the algorithmic coin TerraUSD (UST) lost its peg and wiped out roughly $40 billion within days, dragging the wider market down with it. That failure is why almost all serious stablecoins today are backed by real assets or crypto, not by an algorithm alone. The next sections show how each surviving model works.
How do fiat-backed stablecoins like USDC and USDT work?
Fiat-backed stablecoins work in a simple way. A company holds one dollar of reserves for every token in circulation, so each token can be redeemed for a real dollar. The issuer takes in dollars, mints an equal number of tokens, and holds the cash in safe assets like short-term US Treasuries. Redeem your tokens, and the issuer burns them and returns the dollars.
The two giants take slightly different paths to the same peg. Tether's USDT is the most widely traded, with the deepest liquidity across exchanges. It has shifted its reserves heavily toward US Treasury bills, reporting a Treasury position above 100 billion dollars in early 2026 (source: Datawallet stablecoin analysis). Circle's USDC emphasizes transparent, regularly attested reserves and clear redemption, which has made it the preferred choice where compliance matters. Both aim for the same thing: a token that is always worth a dollar because a real dollar stands behind it.
What actually holds the peg is arbitrage, not just reserves sitting in a vault. If USDC ever trades below a dollar, large traders buy it cheap and redeem it with the issuer for a full dollar, and that buying pushes the price back up. If it trades above a dollar, the reverse happens. One nuance beginners miss: this direct redemption is mostly for big, verified institutions, not retail. An ordinary holder usually just sells on an exchange and relies on those large arbitrageurs to keep the market price near a dollar. It also helps to know that most issuers publish reserve attestations, a lighter check by an accounting firm, rather than a full financial audit.
The model's weak point is the bank holding the reserves, and one episode proved it. In March 2023, USDC briefly lost its peg after it emerged that part of Circle's cash was held at a bank that failed. The reserves were ultimately recovered and the peg restored within days. But the scare showed that a fiat-backed coin inherits the risk of wherever its dollars sit (source: Ethereum.org stablecoins overview). The lesson is not that USDC is unsafe, but that "backed by dollars" only helps if those dollars are truly accessible. How stablecoins fit a broader portfolio is a separate question our guide on stablecoins in a portfolio takes up, and trader-focused tactics live in our notes on stablecoin strategies for traders.
How does a crypto-collateralized stablecoin like DAI work?
A crypto-collateralized stablecoin keeps its peg in a different way. Users lock up crypto worth more than the tokens they mint, and no company holds any dollars. On the Sky protocol, formerly MakerDAO, you deposit collateral such as ETH into an on-chain vault and the protocol lets you mint DAI against it. Because the collateral is worth more than the DAI created, the system stays solvent even if prices fall.
The over-collateral cushion is what replaces a company's promise. If you lock 150 dollars of crypto, you might mint up to 100 dollars of DAI, leaving a buffer. If your collateral falls too far, the protocol liquidates it to keep every DAI backed. This is the same liquidation logic that governs on-chain lending generally, which the pillar's guide on lending mechanics covers in detail. The peg is also defended by tools like a module that swaps DAI one-for-one with USDC, anchoring it to the fiat-backed world when needed.
Sky's newer token, USDS, shows where this model is heading. Launched as an upgrade to DAI, USDS adds features aimed at institutions. These include compliance controls, such as the ability to freeze tokens in specific cases. Its collateral mix now includes tokenized real-world Treasuries alongside crypto vaults (source: Gate Learn: Sky protocol and USDS). DAI and USDS convert one-for-one in both directions, so users can move between them freely, and a large migration from DAI to USDS ran in 2026. The growing use of tokenized Treasuries as backing links stablecoins to the wider trend our guide on real-world asset tokens explores.
A newer twist is the yield-bearing stablecoin, which pays you a return just for holding it. Tokens like sDAI, USDe, and USDY pass through income from their backing, such as tokenized Treasuries or staking, instead of letting the issuer keep it. The appeal is obvious, but so is the catch: that yield comes from somewhere, so these carry extra risk, whether from the underlying strategy, the smart contracts, or, in some designs, borrowed positions that can unwind in a crisis. A yield-bearing token is not the same low-risk "digital dollar" as a plain fiat-backed coin, and the higher the advertised return, the more carefully its source deserves checking.
How do USDC, USDT, and DAI compare?
They split along two lines: who backs them, and how regulated they are. The table puts the three most common dollar tokens side by side.
Token | Backing | Issuer | Notable trait |
|---|---|---|---|
USDT (Tether) | Fiat reserves, mostly US Treasuries | Tether, a company | Deepest liquidity, most-traded |
USDC | Fiat reserves, regularly attested | Circle, a company | Transparency and compliance focus |
DAI / USDS | Crypto collateral plus some reserves | Sky protocol, on-chain | Decentralized, no single company |
Regulation now shapes which of these you can even access. Two big frameworks arrived recently: the European Union's MiCA rules, in force since December 2024, and the United States' GENIUS Act, enacted in July 2025, both setting reserve and redemption standards for stablecoin issuers (source: World Economic Forum: GENIUS Act versus MiCA). The practical effect is already visible. Because Tether did not seek MiCA authorization, most EU-regulated exchanges removed USDT for European customers through early 2025, while compliant coins like USDC gained ground (source: Eco: why USDT is restricted in the EU). USDT remains legal to hold, but where you live increasingly affects which stablecoin is easiest to use.
What does "native" versus "bridged" stablecoin mean?
A native stablecoin is the canonical token issued directly by its company on a given network, while a bridged version is a wrapped stand-in created by a third-party bridge. They are not the same asset, and confusing them is a real and costly mistake. Native is the genuine article; bridged is an IOU for it.
The distinction matters most on Layer-2 and alternative networks. When Circle deploys USDC natively on a network, every such USDC is the same Circle-issued token, fully redeemable and treated as interchangeable by exchanges and apps. A bridged version, often labeled with a suffix like "USDC.e", is minted by a separate bridge. That bridge holds the real USDC elsewhere and issues a claim on it. That bridged token depends on the bridge's security, not Circle's. So if the bridge is hacked or fails, the wrapped token can lose its backing and trade at a discount. Bridges have been among the most exploited targets in crypto, which makes this dependency a genuine risk.
From Blofin's operational perspective, this is exactly why the network and token version you choose at withdrawal matter. Sending to the native stablecoin on a supported network is clean and fully fungible. Receiving a bridged version on an unexpected network is riskier. You can end up holding a token that some apps and exchanges will not accept at face value. Checking that you are using the native token, on a network the receiving service supports, before you send, prevents a frustrating and sometimes expensive surprise.
How does Circle's CCTP move USDC across chains?
Circle's Cross-Chain Transfer Protocol, or CCTP, moves native USDC between networks in a clean way. It destroys the USDC on the source chain and mints fresh native USDC on the destination, with no wrapped token involved. This avoids the bridged-IOU problem entirely, because at no point does a third-party bridge hold your funds or issue a stand-in. You always end up with the real, canonical token.
The mechanism is a clean burn-and-mint, and the steps are easy to follow:
You send USDC into CCTP on the source network, and the protocol burns it, removing those tokens from that chain.
Circle's attestation service signs a message confirming the burn actually happened.
The protocol mints the same amount of fresh, native USDC to you on the destination network.
Because the tokens are destroyed and recreated rather than locked and wrapped, there is no liquidity pool to drain and no bridge custodian to trust (source: Circle Cross-Chain Transfer Protocol). The newer version of the protocol, live since 2025, expanded to more than a dozen networks and added near-instant transfers measured in seconds rather than minutes. For a user, the practical result is simple. Moving USDC between major networks can now deliver the genuine native token quickly, sidestepping the wrapped-token risk that older bridges carried.
Frequently asked questions
Are stablecoins always exactly worth one dollar?
Not always, though the major ones stay very close most of the time. A stablecoin's price can drift slightly above or below a dollar, based on supply, demand, and confidence in its backing. It can also break sharply in a crisis. USDC briefly fell below a dollar in 2023 during a banking scare, and an algorithmic coin collapsed to near zero in 2022. Well-backed fiat and crypto-collateralized coins tend to recover quickly because they can be redeemed, but "stable" means designed to hold a dollar, not guaranteed to.
What actually happened in the 2023 USDC depeg?
In March 2023, it emerged that part of the cash backing USDC was held at a US bank that suddenly failed. Worried that those reserves might be lost, traders sold USDC, and its price briefly dropped below a dollar. The funds were ultimately recovered once the bank situation was resolved, and USDC returned to its peg within days. The episode did not show that USDC was unbacked. It showed that a fiat-backed coin carries the risk of wherever its real dollars sit, including ordinary banking risk.
Is DAI backed by real dollars?
Mostly not directly; DAI is backed by crypto collateral locked in on-chain vaults, plus some stablecoin and tokenized-Treasury backing. Users mint DAI by depositing crypto worth more than the DAI they create, and the protocol liquidates that collateral if its value falls too far. Over time, its issuer Sky has added a module that swaps DAI for USDC and included tokenized real-world Treasuries, so DAI's backing is now a mix. The key difference from USDC is that no single company holds the reserves.
What is the difference between native and bridged USDC?
Native USDC is issued directly by Circle on a given network and is fully redeemable and interchangeable. Bridged USDC is a wrapped version, often marked with a suffix, created by a third-party bridge that holds the real USDC elsewhere. The bridged token depends on that bridge's security rather than Circle's, so it can lose its backing if the bridge is compromised. Always check whether you are holding the native token, because some apps and exchanges treat a bridged version differently or not at all.
Why did MakerDAO become Sky?
MakerDAO, the long-running project behind DAI, rebranded to Sky as part of a broader upgrade that introduced a new flagship stablecoin, USDS, alongside DAI. USDS adds features aimed at institutional users and a wider collateral mix, while DAI continues and converts one-for-one with USDS. The change was an evolution of the same underlying system rather than a replacement, intended to broaden adoption. Users of DAI were not forced to switch, since the two tokens remain freely interchangeable.
Are algorithmic stablecoins safe?
History says treat them with deep caution. Algorithmic stablecoins try to hold a peg through supply adjustments and minimal hard backing, and the most prominent attempt collapsed in 2022, erasing tens of billions of dollars when confidence broke. Without real reserves or overcollateralization, these designs can enter a death spiral where falling price and falling confidence feed each other. Most of the market has since moved to fiat-backed or crypto-collateralized models, and a stablecoin that cannot point to solid backing deserves serious skepticism.
Researched and written by the Blofin Academy editorial team with AI-assisted drafting. Primary sources include the Ethereum.org stablecoins overview and the Circle Cross-Chain Transfer Protocol documentation, with issuer and reserve details drawn from Sky protocol documentation and current stablecoin research. All facts independently verified against cited sources current as of June 2026.
This article is for informational purposes only and does not constitute financial advice, investment guidance, or a recommendation to buy, sell, or hold any digital asset. Stablecoins carry real risks, including loss of peg, reserve or banking failure, smart-contract and bridge risk, and the near-total collapse seen in some algorithmic designs. Cryptocurrency markets involve significant risk and you should conduct your own research and consult qualified professionals before making decisions.