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 value of Bitcoin might fall by 5% before the transaction is confirmed.

Or you have made a profit trading Ethereum and want to lock in your gains, without moving funds all the way back to your Australian bank account and paying extra fees.

In both cases, price volatility is the problem. Stablecoins aim to fix that.

They are designed to give you the benefits of crypto, such as speed and global reach, while keeping a value that closely tracks traditional money.

What is a stablecoin?

A stablecoin is a type of cryptocurrency that tracks the value of an external asset. This link is called a “peg”.

The price of Bitcoin is set purely by supply and demand, so it can move up or down very quickly. A stablecoin, on the other hand, is designed to sit at a specific price, most commonly 1.00 US dollar (USD $1.00).

You can think of a stablecoin as digital cash on a blockchain. Just as you might hold Australian dollars in a digital wallet like PayPal or a banking app, you can hold stablecoins in a crypto wallet.

The difference is that stablecoins can be sent globally, 24/7, without relying on bank opening hours, bank holidays, or costly international transfer fees.

For Australians, this can make it simpler to move value between exchanges, platforms and even overseas, without moving back and forth between AUD and foreign currencies at every step.

How stablecoins maintain value

To keep a token worth roughly 1.00 US dollar (or the value of its target asset), stablecoin issuers usually rely on some form of reserve system.

For every digital token created, the issuer holds assets in a reserve. If you want to redeem your stablecoin for regular currency, the issuer takes funds out of the reserve to pay you, then destroys (burns) the token.

In theory, this means each token is backed by real assets of equal value.

In practice, not all stablecoins work in the same way. Some hold cash and cash equivalents. Others use crypto collateral. A few use complex financial strategies or algorithms.

It is important to understand which model you are dealing with.

The four main types of stablecoins

Stablecoins are usually grouped by the method they use to maintain their peg.

1. Fiat‑collateralised

This is the most common type. These tokens are backed 1:1 by government‑issued currency (fiat) such as the US dollar or euro, often together with short‑term, highly liquid assets like US Treasury bills.

• Example: USDC, EURC

• How it works: If there are 1 billion tokens in circulation, the issuer should hold USD $1 billion in cash and high‑quality assets in bank and custody accounts.

Holders rely on the issuer’s promise that anyone can redeem 1 token for 1 US dollar, subject to the issuer’s terms and conditions.

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 began as a tool for traders, but they now serve a much wider range of uses, both globally and for Australian users.

Global remittances

International bank transfers can be slow and expensive. Fees, exchange rate spreads, and delays can eat into the amount your recipient actually receives.

Instead, a sender can buy stablecoins using their local currency, then transfer those coins to the recipient’s digital wallet. The transfer usually settles in minutes and, in many cases, with lower fees compared to traditional remittance channels.

Because the stablecoin price tracks a major currency such as the US dollar, the recipient does not face the same price volatility they would get with a token like Bitcoin.

They can then convert the stablecoins into their local currency using a compatible exchange or local service.

Decentralised Finance (DeFi)

Stablecoins are central to the DeFi ecosystem. Many DeFi protocols are built around them.

Users can deposit stablecoins into lending or savings protocols to earn interest (often called “yield”). Because the underlying asset aims to keep a steady value, the main variable is the interest rate, rather than the token price.

This can make returns more predictable than staking or lending highly volatile assets like Bitcoin or smaller altcoins.

However, DeFi introduces its own risks, including smart contract bugs, platform failures, and changes in regulation. Yield is never guaranteed.

Trading and capital protection

When crypto markets become unstable, traders often move from volatile assets like BTC or ETH into stablecoins.

This lets them reduce exposure to price swings while keeping funds on‑chain and ready to deploy. They can wait, then move quickly when they see a new opportunity, rather than withdrawing to a bank account and then redepositing later.

In many jurisdictions, selling crypto for fiat currency can be a taxable event. Moving from one crypto asset to another, including to a stablecoin, may also be taxable, depending on local rules.

Australian users should check the Australian Taxation Office (ATO) guidance or speak with a tax professional before assuming any particular treatment.

Risks and red flags

Stablecoins are designed to be more predictable than other cryptocurrencies, but they are not risk‑free. It is important to understand where things can go wrong.

• De‑pegging events
  In extreme market conditions, during technical failures, or if confidence breaks down, a stablecoin can lose its peg. For example, a token that targets USD $1.00 might trade at USD $0.95 or lower.

  Large, well‑established stablecoins have usually recovered from short‑term de‑pegs, but there is no guarantee. Some algorithmic stablecoins have collapsed completely.

• Reserve transparency
  For fiat‑backed stablecoins, you must trust that the issuer actually holds the reserves they claim. Reputable issuers publish regular reserve reports, often reviewed or attested to by independent accounting firms.

  Be cautious with stablecoins that do not provide clear, frequent, and detailed information about their backing, where funds are held, and who audits them.

• Centralisation
  Crypto‑collateralised and algorithmic models are often more decentralised. By contrast, most fiat‑backed stablecoins are issued by a company.

  That issuer usually has the power to freeze funds, block transfers, or blacklist addresses in order to comply with legal and regulatory requirements. This can be positive from a compliance point of view, but it does mean users are exposed to centralised control.

• Counterparty and regulatory risk
  If you hold a centralised stablecoin, you are exposed to the issuer’s solvency and operations. If the company faces insolvency, fraud, or severe regulatory action, the token’s value could be affected.

  Changes in laws or guidance in major markets can also have knock‑on effects for how easily a stablecoin can be used or redeemed.

• Smart contract and platform risk
  For crypto‑collateralised and DeFi‑based stablecoins, users rely on smart contracts and protocol design. Bugs, hacks, or poor risk management can lead to loss of funds or de‑pegging.

Before holding or using a stablecoin, it is wise to consider what type it is, who stands behind it, and what protections are in place.

The future of stablecoins

As cryptocurrency markets mature, stablecoins are becoming more connected with the traditional financial system.

Regulators are paying closer attention. In Europe, for example, the Markets in Crypto‑Assets (MiCA) framework sets standards for reserves, disclosures, and governance for issuers operating in the region.

Other jurisdictions are exploring their own rules. This includes questions about licensing, capital requirements, consumer protection, and how stablecoins should interact with existing payment systems.

At the same time, traditional financial institutions are getting involved. Major payment processors, fintech firms, and banks are exploring, launching, or supporting stablecoins as a way to speed up settlement and reduce costs.

For everyday users, this could mean stablecoins become a familiar part of online payments, cross‑border transfers, and digital wallets, not just a tool used by traders and crypto enthusiasts.

For Australian users, the key will be how local regulation develops, how exchanges and platforms implement those rules, and which stablecoins are supported by reputable, compliant service providers.