Types of stablecoins: how each kind is backed

Stablecoins are sorted into a few types based on what backs them: cash and government bonds, other crypto, a computer program, a hedged trading position, or short-term US Treasuries. Each type aims for the same $1 value, but each holds that value a different way and carries a different main risk.

The backing is the whole story. It decides whether you hold a claim on real dollars in a bank, on crypto locked in code, or on a trading position someone manages every day. In calm markets every type trades near a dollar. The gap only shows under stress, which is when the type tells you how far to trust the peg. New to the idea? Start with what a stablecoin actually is first.

The catch is simple: one friendly label covers very different promises, so the type is how you judge the real risk.

What the backing model tells you

A stablecoin's backing model is the thing standing behind its dollar. It sets three things you care about: who holds the money, whether you can swap the coin back for real dollars, and how it breaks when it breaks. Five models cover almost every stablecoin you will meet today.

In quiet markets this feels like trivia, since a dollar is a dollar and every coin trades near $1. The model only earns its keep on a bad day. A coin backed by cash in a bank can wobble if that bank fails. A coin backed by crypto can wobble if the crypto drops too fast. A coin backed by nothing but a rule can drop to zero if people stop believing it. Same price on a calm Tuesday, very different floors under pressure.

Here is the quick map before we walk through each one.

Two columns in that table matter most. The first is the claim you actually hold. A fiat-backed coin is a claim on a company's reserve. A crypto-backed coin is a claim on collateral locked in code. An algorithmic coin gives you no hard claim at all. A synthetic coin is a claim on a managed hedge, and a Treasury-backed product is a claim set by the product's terms. The second column is the failure mode each claim implies. A custodial failure, where real assets exist but are briefly out of reach, can be repaired. A design failure, where little sits behind the coin to begin with, has far less to fall back on. That pairing is why the type, not the branding, tells you how far a price can fall.

The sections below run from the most-backed types to the least-backed, then to the two newest designs. How a coin actively fights its way back to a dollar is a separate topic, covered in how a peg holds. And if you are weighing any of this against simply holding cash or volatile coins, how bitcoin compares to fiat covers that money question.

Fiat-backed stablecoins: dollars in a bank

Fiat-backed stablecoins are the simplest and most common type. A company holds real cash and short-term government bonds, then issues one coin for every dollar it holds. You trust the company to keep the money safe and to hand it back on request. USDT and USDC are the best-known examples.

This is the type most people meet first, and the backing is easy to picture. Money sits in accounts and funds, and each coin is a digital receipt for it. The Bank of England puts it simply: the issuer holds the same value in real money, and you have the right to swap the coin back on request (source: Bank of England stablecoin explainer). So the claim you hold is on the issuer, not on any specific dollar. Two things then decide how sound it is: what the reserve holds, and whether you can reach it. Cash and short-term government debt are the strongest holdings, because they turn into spendable money quickly. A reserve stuffed with slower or riskier assets is weaker, even at the same headline size. Redemption usually runs through the issuer for large, verified clients, and everyone else trades on the open market. That is why the main risk here is not the crypto. It is the reserve and its custody: a coin can be fully backed and still slip if the cash behind it is stuck. How a fiat-backed coin is created and cashed out, what belongs in the reserve, and how to read the disclosure are covered in how fiat-backed coins work.

On BloFin's platform, the fiat-backed pair, USDT and USDC, is what actually carries day-to-day settlement and quoting. That is why we watch their reserve quality more closely than any other detail. Most of these coins also live on several blockchains at once, and stablecoins on the Ethereum network shows how the same token works there.

Crypto-collateralized stablecoins

Crypto-collateralized stablecoins are backed by other crypto instead of cash. Because crypto prices swing, the system locks up more value than it issues. Smart contracts, not a company, hold that collateral. DAI is the classic example.

Think of a pawn shop. You pledge something worth more than the cash you want, and if you walk away the shop sells it to make itself whole. Here the "shop" is code on a blockchain. The pledge is crypto worth more than the dollars you mint. That extra margin is the defining feature of the type. DAI ran at about 150% crypto collateral in its earlier design (source: Richmond Fed brief on stablecoin design), a cushion meant to absorb a fall in crypto prices. That figure is now dated: by 2026, Sky Protocol's collateral behind DAI and USDS runs roughly 40% real-world assets and Treasuries plus 35% USDC, with crypto down to a minority of the backing, and system-wide collateralization ratios ranging from about 116% to 172% depending on the metric and date.

The claim you hold is on that locked collateral, not on a company. Because it sits on-chain you can watch it, so this type is more open than a bank statement you take on trust. The trade-off is where the main risk lives. With crypto now a minority of the backing, that risk is less about a pure price crash and more a mix of custody risk on the RWA and USDC portion, plus the residual danger that a sharp drop in the remaining crypto collateral outruns the system's ability to keep the coin covered. How DAI and Sky's USDS are minted and managed, and how the price is steadied day to day, are covered in how crypto-backed coins work. Because the design lives inside decentralized apps, DeFi on Ethereum is useful background for how those contracts fit together.

Algorithmic stablecoins: code instead of collateral

Algorithmic stablecoins try to hold a dollar with a rule and a paired token rather than real backing. When the price drifts, the code mints or burns coins to push it back. There is little or no collateral to claim, so the design rests on confidence. When that confidence goes, it can fall apart fast. TerraUSD is the warning.

The Federal Reserve puts the core weakness plainly: these coins keep "few or no assets" in reserve (source: Federal Reserve note on stablecoin design). So the peg leans on a paired token and on people believing the rule will hold. That is the structural difference from every backed type. A fiat-backed coin has cash behind it, and a crypto-backed coin has collateral behind it. An algorithmic coin has no pool you can claim if the rule stops working, which is why it sits at the bottom of the backing ladder. The peg is a promise, not a pile of assets, so this type behaves differently under stress. A backed coin can ride out a drop and recover, because real value sits underneath it. A pure algorithmic coin has nothing to restore the price, so the same drop can be permanent. The label also covers a range, from purely rule-based coins to ones that mix in a slice of collateral, but the pure version has the least to fall back on. TerraUSD, or UST, is the case study the whole category is measured against. How algorithmic coins work walks through the design families, the failure loop, and why the pure version is the weakest.

Synthetic, delta-neutral stablecoins

Synthetic, delta-neutral stablecoins are backed by crypto plus an offsetting bet that cancels the price swings. For each coin, the issuer holds crypto and opens an equal short futures position, so a drop in the crypto is matched by a gain on the short. The dollar value stays roughly flat. USDe, from Ethena, is the best-known example.

"Delta" just means price exposure, and "neutral" means it has been canceled out. The crypto the protocol holds and the short position it runs move in opposite directions, so the combined value sits near a dollar even as the crypto swings (source: Ethena USDe overview). That makes the claim you hold unlike any other type on this list. It is not cash in a bank or collateral locked in a contract. It is a position in a live hedge that someone has to keep running. So the value depends on things outside the coin itself: the derivatives markets the hedge trades in, and the exchanges and custodians that hold the position. The main risk is not a bank failing or collateral crashing. It is the hedge breaking down or a venue holding it failing. This is one of the newer designs in the category. It shows how far the idea of a stablecoin now stretches, since a coin can hold its dollar through a trade rather than through a vault. The perpetual futures that make the hedge work are a trading instrument in their own right, and their mechanics belong with the trading guides rather than here.

Treasury-backed and yield-bearing stablecoins

Treasury-backed stablecoins hold short-term US government debt, among the safest and most liquid dollar assets. Some are built to pass that interest back to you, and some are not. That split is the whole story for this type, because US law will treat a coin that pays you very differently from one you only spend.

In the US, the GENIUS Act was signed in 2025 as a federal law written for payment stablecoins (source: GENIUS Act, Public Law 119-27). It is not fully in force yet. Once it takes effect, it will require issuers of payment stablecoins to hold full backing in high-quality assets like short-term Treasuries. It will also bar those issuers from paying holders any interest or yield just for holding the coin. The exact effective dates and the wider legal fine print sit with tax and rules coverage, not here.

So the type really splits in two. Payment coins like USDC are built for spending, and their issuers are not set up to pay you for holding them. Yield-bearing dollar tokens are built instead as funds or securities that can pass Treasury interest to holders. USDY from Ondo is one example, accruing daily Treasury yield for eligible holders (source: Ondo USDY). Those are close cousins of stablecoins, built on real-world assets brought on-chain. They are not the same as a spend-anywhere payment coin, and the wrapper around them is its own subject.

From BloFin's operational view, RWUSD sits on the yield side of that line. You subscribe with USDT, the balance earns a daily reward benchmarked to tokenized Treasury yields, and it lives inside BloFin Earn, not as a coin you can send to an outside wallet. The takeaway for a holder is simple: if a dollar token pays you, read it as a yield product with its own terms, not as a plain payment stablecoin.

How can you tell which type you're holding?

To tell which type a dollar token is, look at what stands behind it: cash and bonds held by a company, crypto locked in code, a rule and a paired token, a hedged trading position, or a Treasury fund that pays you. The backing answers which type you hold, and the type points to the main risk.

Two questions do most of the sorting: what backs the coin, and does it pay you? Cash and short-term Treasuries held by a company mean fiat-backed. Crypto locked in a contract means crypto-collateralized. A paired token doing the stabilizing means algorithmic. A hedge against crypto means synthetic. And a coin that pays a yield is a Treasury-backed or yield product, not a plain payment coin. Those five buckets cover almost every dollar token you will run into, and the odd one out is usually a mix of two of them. Matching a coin to its type is the easy part. Judging whether a specific issuer is trustworthy, reading its reserve report line by line, and deciding how much to hold are separate skills that the evaluation and reserve-report guides cover. One trap is worth naming while you sort. A platform's proof of reserves is not the same as a stablecoin issuer's reserves. It shows an exchange holds the crypto it owes users, not that the dollars behind a given coin are really there. And how much risk any type carries for you is the kind of question risk against reward covers across crypto.

Frequently asked questions

Does knowing the type tell you a stablecoin is safe?

Not on its own. The type tells you what backs a coin, what you hold a claim on, and how it tends to fail. That is a useful first filter. It does not tell you whether a specific coin is well run, because two coins of the same type can hold very different reserves and answer to very different issuers. Read the type as the category and its main failure mode. Leave the verdict on any single coin to a closer look at that coin's own backing and disclosure.

Are USDT and USDC the same type of stablecoin?

They are the same type, both fiat-backed, but they are not the same risk. Each has a different issuer and its own reserve mix, and their disclosure habits differ too. Their reserves are not identical, and one may report more often or hold safer assets than the other. So they share a category while carrying different issuer risk. That is the whole reason the type is a starting point rather than the last word.

Does "not fully backed by cash" always mean a coin is algorithmic?

No. Several types hold something other than cash without being algorithmic. A crypto-collateralized coin is over-backed by crypto, and a synthetic coin is backed by crypto plus a hedge, so both have assets standing behind them. A coin is only algorithmic when a rule and a paired token, rather than reserves, do the stabilizing. The test is not whether cash is missing. It is whether anything you can claim stands behind the coin at all.

How is a synthetic stablecoin different from a crypto-collateralized one?

Both start from crypto, but the claim you hold is built differently. A crypto-collateralized coin holds more crypto than it issues, so a spare cushion of collateral stands behind it. A synthetic coin holds crypto and an offsetting short position, so a live hedge, not a cushion, is what holds the value. That is why they sit in separate categories even though both begin with crypto. One leans on extra collateral, the other on a hedge someone has to manage.

Can a stablecoin change from one type to another?

It can, because the type follows the backing, and the backing can change. An issuer can shift what stands behind a coin. A project can add or drop collateral, which can move a coin toward or away from a category over time. A newer design can also blur the lines by mixing models. So a coin's type is worth confirming from what backs it now, rather than assuming it from the name it launched with.

What are commodity-backed stablecoins, and are they the same thing?

They are a related but separate category. Commodity-backed tokens, such as PAX Gold or Tether Gold, are backed by a physical commodity, usually gold held in a vault. Tether Gold, for instance, holds its gold in vaults via a Swiss custodian (source: Investopedia's stablecoin overview). The key difference is that they track the price of the metal, not a steady dollar, so their value rises and falls with gold. That makes them a way to hold gold exposure, not a dollar stablecoin.

Researched and written by the BloFin Academy editorial team with AI-assisted drafting. Updated July 2026. Primary sources: the Bank of England, the US Federal Reserve, the Richmond Fed, Ethena, Ondo Finance, and the text of the GENIUS Act (Public Law 119-27). All facts independently verified against cited sources current as of July 2026.

This article is educational and general in nature, not financial, investment, tax, or legal advice. Stablecoins carry risk, including loss of value and loss of access, and no stablecoin is guaranteed to hold its peg. Do your own research, and consider a licensed professional before acting. BloFin does not provide investment advice.