What Is a Stablecoin?
A stablecoin is a type of cryptocurrency designed to maintain a stable value by pegging it to a reference asset — most commonly the US Dollar, but also other currencies like the British Pound, the Euro, or commodities like gold.
Unlike Bitcoin or Ethereum, whose prices can swing dramatically day to day, stablecoins aim to provide the best of both worlds: the speed, borderless nature, and programmability of cryptocurrencies, combined with the price stability of traditional fiat currencies.
Why Do Stablecoins Exist?
The crypto ecosystem needed a stable medium of exchange. Imagine trying to trade when your currency drops 20% overnight — that’s the reality of trading with volatile cryptocurrencies. Stablecoins solve several key problems:
- Trading pairs: Most crypto exchanges use stablecoin pairs (e.g., BTC/USDT) rather than fiat pairs, enabling faster trading without bank transfers
- DeFi participation: Lending, borrowing, and yield farming all require a stable unit of account
- Remittances: Sending money across borders cheaply and quickly
- Store of value: Holding funds in crypto without exposure to volatility
- Earn yield: Generating returns through staking, lending, and liquidity provision
Types of Stablecoins
1. Fiat-Backed Stablecoins
These are backed by reserves of fiat currency held by a central issuer. For every token in circulation, there should be an equivalent amount of fiat held in reserve.
Examples: USDT (Tether), USDC (USD Coin), BUSD (Binance USD)
Pros: Simple to understand, most widely adopted, generally most stable Cons: Requires trust in the issuer, centralised, subject to regulatory action
2. Crypto-Backed Stablecoins
These are backed by other cryptocurrencies held as collateral in smart contracts. They typically use over-collateralisation to absorb price fluctuations.
Examples: DAI (MakerDAO), LUSD (Liquity)
Pros: Decentralised, transparent on-chain, no reliance on traditional banking Cons: More complex, can be less capital-efficient, vulnerable to crypto collateral price crashes
3. Algorithmic Stablecoins
These use algorithms and smart contracts to control supply and demand, maintaining the peg without direct backing. They may incentivise users to buy or sell to keep the price stable.
Examples: UST (Terra — collapsed 2022), FRAX (Frax Protocol)
Pros: Capital efficient, doesn’t require reserves Cons: Highest risk of depegging, proven fragile in extreme market conditions
4. Commodity-Backed Stablecoins
These are backed by physical commodities like gold, silver, or oil.
Examples: PAXG (Pax Gold), XAUT (Tether Gold)
Pros: Exposure to commodity prices, inflation hedge Cons: Less liquid, dependent on commodity storage and auditing
The Major Stablecoins Explained
USDT (Tether)
- Market cap: $100B+ (largest stablecoin)
- Backing: US Dollar reserves (cash, treasuries, commercial paper)
- Use case: The dominant trading pair on virtually every exchange
- Controversy: Historical concerns about reserve transparency, though attestation reports have improved
USDC (USD Coin)
- Market cap: $30B+
- Backing: US Dollar reserves (cash and short-term US treasuries)
- Issuer: Circle
- Reputation: Generally considered the most transparent and well-regulated stablecoin
- Use case: Preferred by institutions and DeFi protocols
DAI
- Market cap: $5B+
- Backing: Over-collateralised with various cryptocurrencies (ETH, USDC, WBTC)
- Governance: MakerDAO decentralised governance
- Use case: DeFi-native stablecoin, widely used in lending and borrowing
FDUSD (First Digital USD)
- Market cap: $2B+
- Backing: US Dollar reserves held in Hong Kong
- Issuer: First Digital Labs
- Use case: Growing adoption on Binance as BUSD replacement
How Do Stablecoins Work?
The mechanism depends on the type:
Fiat-backed: You give the issuer $1, they mint 1 USDT. When you redeem, they burn the token and give you $1 back. The peg is maintained through this minting/redemption mechanism.
Crypto-backed: Users lock up crypto collateral in a smart contract (e.g., lock $150 of ETH to mint $100 of DAI). If the collateral value drops too low, the position is liquidated. This over-collateralisation ensures the system remains solvent.
Algorithmic: The protocol expands or contracts the token supply based on demand. When the price is above $1, new tokens are minted. When below $1, tokens are burned or incentives are created to reduce supply.
Stablecoins and UK Regulation
The UK has taken a proactive approach to stablecoin regulation:
- FSMA 2023 brought stablecoins used for payments into the regulatory perimeter
- The FCA requires crypto businesses operating in the UK to register
- The Bank of England is developing a framework for systemic stablecoins
- HMRC treats stablecoins as cryptoassets for tax purposes — Capital Gains Tax applies to gains, and Income Tax may apply to staking rewards
Getting Started with Stablecoins
- Choose an exchange — See our exchange reviews for UK-friendly options
- Complete KYC — UK regulations require identity verification
- Buy stablecoins — Most exchanges let you buy USDT or USDC directly with GBP via bank transfer
- Store safely — Keep on the exchange for trading, or move to a self-custody wallet for holding
- Start exploring — Check out our trading strategies for ways to profit
Risks to Consider
- Depegging risk: Even established stablecoins can temporarily lose their peg
- Issuer risk: The company behind the stablecoin could face regulatory or financial difficulties
- Smart contract risk: For DeFi stablecoins like DAI, bugs in the code could be exploited
- Regulatory risk: Government actions could restrict stablecoin usage
- Liquidity risk: In extreme market conditions, redeeming stablecoins could become difficult
Conclusion
Stablecoins are the backbone of the cryptocurrency ecosystem, enabling trading, DeFi, and cross-border payments without the volatility of traditional crypto. For UK traders, understanding how stablecoins work is essential before diving into crypto trading.
Ready to learn more? Check out our guide on how to trade stablecoins or explore our exchange reviews to find the right platform for you.