Stablecoin Explained: Types, Pegs and the Risks Behind $1
Lesson 1 of 9 · Beginner
Stablecoins in plain English
A stablecoin is a token on a blockchain that is designed to track the value of a reference asset, most often the US dollar. That link is called a peg. The goal is to give the volatile crypto world a roughly constant unit of account: traders measure profit and loss in it, exchanges build trading pairs against it, and users move money between wallets and platforms with it.
The first thing to understand is that “stable” describes an attempt to stay stable, not a guarantee. A stablecoin’s price on the secondary market (exchanges and liquidity pools) is set by supply and demand, and some mechanism sits behind it that is supposed to pull any deviation back to one dollar. If that mechanism is weak, or confidence disappears, the price breaks away from the peg. That event is called a depeg, and later lessons examine real examples.
The market is not small. According to a Crypto-Economy report in October 2026, total stablecoin supply was roughly 300 billion dollars, with Tether (USDT) alone estimated at about 184 billion.
The four main families of stablecoin
The cleanest way to sort stablecoins is by what stands behind each dollar. The examples below exist to explain mechanisms and are not a recommendation to buy or hold any of them.
| Type | Backing | Well-known example | Main risk |
| Fiat-backed | Cash, bank deposits and short-term securities held by an issuing company | USDT, USDC | Issuer, custodian, freezes and regulators |
| Crypto-collateralised | Crypto such as ether locked in a smart contract, worth more than the stablecoins issued | DAI | Sharp collateral crashes, contract bugs, oracles |
| Synthetic / delta-neutral | A crypto asset paired with a short perpetual futures position that cancels price moves | USDe | Negative funding, exchange risk, liquidity |
| Algorithmic | Arbitrage incentives with a second token, without enough outside backing | UST (collapsed in 2022) | A death spiral once confidence breaks |
These borders are not always clean. Some projects are hybrids and keep part of their reserves in other assets. That is why the right question is always: “If everyone tries to leave at the same time, where does the money come from?”
What holds the peg?
Each family has a different mechanism for pulling the price back to one dollar:
- Fiat-backed: approved customers of the issuer can hand over one dollar and receive one token (minting), or return a token and receive a dollar (redemption). If the token trades at 0.99 on an exchange, buying it cheaply and redeeming at one dollar is profitable, and that arbitrage pushes the price up. The loop only works if people believe redemption is real.
- Crypto-collateralised: because collateral exceeds debt, if collateral value drops the smart contract liquidates it so that backing stays sufficient. Very fast crashes and oracle errors are the weak points of this model.
- Synthetic: the issuer might buy ether and short an equal amount on perpetual futures, so price moves on the two sides offset. This depends on the health of the exchanges, market depth and the funding rate.
- Algorithmic: the price is controlled by burning and minting a second token. It works while demand lasts; once fear starts, printing the second token drags its value down too, and the loop feeds itself.
In every one of these models, the peg ultimately rests on trust and liquidity.
The risks hiding behind “one dollar”
A stablecoin can trade at exactly one dollar for months and still carry serious risks. A short list to know:
- Issuer and reserve risk: do the reserves really exist, where are they held, and how quickly can they be turned into cash?
- Freeze risk: with centralised stablecoins, the issuer can block addresses. This has its own lesson in this course.
- Contract and oracle risk: in decentralised models, a bug or a wrong oracle price can trigger unfair liquidations or leave the system under-collateralised.
- Venue risk: a stablecoin’s price on one exchange can detach from the rest of the market; 10 October 2025 is an example we cover in the depeg lesson.
- Regulatory risk: a new rule can remove a stablecoin from the exchanges of an entire region.
A stable price in the past does not prove that the structure is stable.
What this means for users in high-inflation or sanctioned regions
In countries with high inflation or weak local currencies, stablecoins, USDT especially, have become a way to hold value. Understanding the mechanism helps you make a more informed decision:
- A stablecoin is not a bank deposit and has no deposit insurance. A small holder usually cannot redeem directly with the issuer and depends on the secondary market to turn tokens back into money.
- The local-currency price of USDT in such a country is not just the dollar rate. Local supply and demand, limits on payment rails and central bank decisions all affect it. Users in sanctioned regions also face extra jurisdiction and compliance risk, including account restrictions.
- Each type of stablecoin has its own set of risks; choosing between them means choosing between risks, not between “safe” and “unsafe”.
The next lessons go into Tether’s exact mechanism, the history of freezes, depegs and network fees to complete the picture.
Common mistakes
- Treating a stablecoin as the same thing as cash dollars or an insured bank deposit.
- Assuming no risk exists because the price has sat at one dollar for months.
- Putting every kind of stablecoin in one bucket without checking what backs each one.
- Trusting stablecoins that promise a fixed, high return without explaining where the return comes from.
- Ignoring that a small holder usually has no right to redeem directly with the issuer.
What do volume and data say here?
Peg health can be seen in data, not only in the issuer’s slogans:
- Price across venues: watch a stablecoin’s price on several centralised exchanges and DEX pools at the same time. A small, brief deviation is normal; a persistent one, or a wide gap between venues, is a warning.
- Volume at the moment of deviation: if price drifts from the peg and trading volume suddenly jumps several times over, real selling pressure exists, not a momentary glitch.
- On-chain supply: block explorers show whether total token supply is rising (minting) or falling (redemption and burning). A sharp supply drop together with a price fall signals capital leaving.
This data does not predict anything; it only helps you see the current situation correctly.
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Frequently asked questions
What is a stablecoin in simple terms?
It is a blockchain token that tries to keep its value equal to a reference asset, usually one US dollar. The stability comes from backing or an arbitrage mechanism and is not guaranteed.
Which type of stablecoin is risk-free?
None of them. Each type has its own risk: issuer and freezes for fiat-backed coins, collateral crashes for crypto-backed ones, funding rates for synthetic ones and a collapse of confidence for algorithmic ones.
Can a stablecoin lose its peg even if it is backed?
Yes. If holders doubt the reserves or cannot redeem quickly, the market price can fall below one dollar even for a coin that has reserves. This is why the redemption mechanism matters as much as the backing.
Education only, not a recommendation to buy or sell; we never give signals. Price examples are illustrative. Test any method on a demo account first, with strict risk management.