What Is a Stablecoin? A Guide to Price‑Stable Cryptocurrency

Imagine you want to send money to a family member overseas using cryptocurrency, but you are worried that the price of Bitcoin could fall by 5% before the transaction is confirmed. Or perhaps you have made a profit trading Ethereum and want to lock in your gains without sending the funds all the way back to a traditional bank account.

In both cases, the price swings of standard cryptocurrencies can be a problem. Stablecoins try to solve this. They aim to combine the privacy, speed and global access of cryptocurrency with a value that is relatively steady compared to traditional money.

What is a stablecoin?

A stablecoin is a type of cryptocurrency that is designed to track the value of an external asset, known as a “peg”. The price of Bitcoin or Ether is set purely by supply and demand, which can lead to rapid and sometimes extreme price moves. By contrast, a stablecoin is engineered to stay around a specific price, most commonly 1.00 USD or 1.00 EUR.

You can think of a stablecoin as a form of digital cash that lives on a blockchain. Just as you might hold a digital balance in a payment app, you can hold stablecoins in a crypto wallet. The key difference is that stablecoins can move between people and platforms globally, 24 hours a day, without relying on bank opening hours or traditional international transfer systems.

How stablecoins aim to maintain value

To keep a token close to its target price, issuers usually use a reserve or collateral mechanism.

For many stablecoins, each token issued is intended to be backed by real‑world assets of equal or higher value, held in reserve. When a user wants to exchange their stablecoin for regular money, the issuer should redeem the token for cash or cash‑equivalents, then remove that token from circulation. In theory, this is meant to ensure that every token can be converted back into underlying assets.

In practice, the level of protection depends on how reserves are managed, where they are held, and how transparent the issuer is. Different designs use different methods, and not all of them have the same risk profile.

The four main types of stablecoins

Stablecoins are usually grouped by how they try to keep their peg.

1. Fiat‑collateralised

This is currently the most common type in the market. These tokens are backed by government‑issued currency (fiat), such as the US dollar or euro, often alongside short‑term government securities and other highly liquid instruments.

• Example: USDC, EURC

• How it works: If there are 1 billion tokens in circulation, the issuer should hold roughly 1 billion units of that currency or equivalent high‑quality assets (for example, cash and short‑dated government bonds) in bank accounts or custodial arrangements.

Under the MiCA framework in the EU, issuers of certain fiat‑backed stablecoins face specific regulatory requirements on reserves, disclosure and governance. This is aimed at improving consumer protection, although it does not fully remove risk.

2. Crypto‑collateralised

These stablecoins are backed by other cryptocurrencies, not by cash in a bank. Because crypto collateral such as Ethereum is volatile, the system uses “over‑collateralisation” to stay safe.

• Example: USDS
• How it works: To create (mint) USD $100 worth of a stablecoin, a user might need to lock up USD $150 worth of Ethereum or another approved asset in a smart contract.

If the value of the collateral falls too far, the protocol can automatically sell (liquidate) it to make sure there is always enough backing behind the stablecoin.

This model removes some centralisation risk, but introduces smart contract and market risk.

3. Commodity‑backed

Commodity‑backed stablecoins are pegged to the value of physical assets, most commonly gold.

• Examples: PAX Gold (PAXG).
• How it works: Each token represents a specific amount of a real‑world commodity, for example one troy ounce of gold, stored in secure vaults.

This lets users gain exposure to assets like gold in a digital, easily divisible form, without having to arrange storage or insurance themselves.

4. Algorithmic and synthetic

Algorithmic and synthetic stablecoins are the most complex and experimental category. Instead of holding full reserves in cash or crypto, they use algorithms, smart contracts, derivatives or hedging strategies to target a stable price.

• Examples: Ethena (USDe).
• How it works: The system might automatically increase or reduce the supply of tokens, or use futures and other financial instruments, to offset price moves and keep the token close to its peg.

Some of these projects have failed in the past, with tokens losing their peg permanently. This category tends to carry higher risk than fully‑backed stablecoins. Pure algorithmic stablecoins, like TerraUSD (UST), which relied entirely on code and token mechanics without real asset backing, are now largely defunct.

Ethena's USDe uses algorithmic strategies and is often called a "synthetic dollar," but unlike UST, it is backed by crypto assets (staked Ethereum) and uses derivatives contracts to hedge against price movements.

This means it has actual collateral behind it, unlike pure algorithmic models that collapsed when market confidence broke down.

Real‑life examples: How stablecoins are used

Stablecoins started as a tool for crypto traders, but their use has expanded over time.

Global remittances

Sending money across borders through banks or money transfer operators can be slow and expensive. In some corridors, fees can reach above 5% of the total amount.

With stablecoins, a sender can buy tokens for euros or another local currency, then transfer them to a recipient’s digital wallet in a few minutes, depending on the blockchain used. The recipient can then hold the stablecoins, exchange them into their local currency using a service in their region, or use them within crypto platforms.

Exchange rates and fees still apply when entering or leaving the crypto ecosystem, and local regulations may limit usage in some countries.

Decentralised Finance (DeFi)

Stablecoins play a central role in many DeFi protocols. Users can lend their stablecoins to others, supply liquidity to trading pools, or deposit them in various on‑chain products that advertise yield.

Because the target price of a stablecoin is relatively steady, the returns can be easier to measure compared to using volatile assets such as Bitcoin. However, yields in DeFi can be highly variable and are never guaranteed. Users face risks from protocol design, smart contract bugs, market moves and, in some cases, fraud.

Trading and temporary capital protection

When crypto markets become unstable, traders often swap volatile assets such as BTC or ETH into stablecoins. This allows them to reduce their exposure to price swings while staying within the crypto ecosystem.

For example, a trader might sell 5,000 EUR worth of Bitcoin into a euro or dollar stablecoin on an exchange, then wait for market conditions to improve before re‑entering positions. This can be more convenient than moving funds back to a bank account, although tax treatment will depend on the rules in each country. In many jurisdictions, trading from one cryptoasset into another can still be a taxable event.

Stablecoins are not a replacement for insured bank deposits, and they do not offer the same legal protections as regulated savings products.

Risks and red flags

Stablecoins are often presented as “safe”, but they carry their own set of risks. It is important to understand these before deciding whether to use or hold them.

• De‑pegging events:
  In periods of stress, technical problems or loss of confidence, a stablecoin can trade away from its target price, for example at 0.95 USD instead of 1.00 USD. Some stablecoins have later returned to their peg, while others have never fully recovered. There is no assurance that any specific stablecoin will maintain its target value.

• Reserve quality and transparency:
  With fiat‑collateralised and commodity‑backed stablecoins, users need to trust that the issuer actually holds the reserves it claims, and that these reserves are of high quality and sufficiently liquid. Reputable issuers publish regular reports or attestations by independent third parties. Even then, attestations are not the same as full audits, and they are based on information available at a particular point in time. Lack of clear, frequent and detailed reporting is a warning sign.

• Centralisation and control:
  Many large stablecoins are issued by private companies. These issuers can, and in some cases must, comply with legal orders to freeze funds, block specific wallet addresses or redeem tokens. While this can help with law enforcement and regulatory compliance, it also means users are relying on a central party that can restrict access to funds in certain situations.

• Counterparty and operational risk:
  Holders depend on the issuer and its partners, such as banks and custodians, remaining solvent and well managed. Problems such as bankruptcy, frozen bank accounts, cyber attacks or poor risk management could affect the ability of the issuer to honour redemptions. In extreme cases, users could lose a part or all of their holdings.

• Regulatory and legal risk:
  Rules for stablecoins are evolving globally. In the EU, MiCA introduces specific categories, such as e‑money tokens and asset‑referenced tokens, with licensing, reserve and disclosure rules. Some existing stablecoins may not meet these standards or could be restricted in the future. Changes in regulation can affect availability, liquidity and legal rights for holders.

No stablecoin is completely risk‑free. Before using one, it is sensible to check the issuer’s documentation, regulatory status, reserve reports and the jurisdictions in which it operates.

The future of stablecoins

As the crypto industry matures, stablecoins are becoming more visible in mainstream finance. In Europe, the MiCA framework is setting clearer rules for issuers that want to offer stablecoins to the public. This includes requirements for reserve management, governance, disclosure and complaints handling.

At the same time, traditional financial institutions are exploring tokenised deposits and other digital money solutions that resemble stablecoins in some ways but are issued inside the regulated banking system. Large payment firms and banks are testing or launching their own products to speed up settlement and cut back‑office costs.

Over the coming years, stablecoins may sit alongside central bank money, commercial bank deposits and other digital payment tools. They could be used not only by crypto traders, but also by businesses and individuals for cross‑border payments, e‑commerce and on‑chain financial services. How far this goes will depend on regulation, user trust and how well issuers manage risk.

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