Stablecoins are the part of crypto that is deliberately designed not to be exciting. Their entire purpose is to hold a steady value while still moving on a blockchain, which makes them genuinely useful, but not risk-free. Here is what UK users should understand before buying one.
What Is a Stablecoin?
A stablecoin is a cryptocurrency built to track the value of another asset, most commonly a fiat currency like the US dollar or the British pound, so that one unit stays close to one unit of that currency. This sits within the wider blockchain landscape we introduced in our blockchain and Web3 guide.
The Main Types of Stablecoin
Fiat-backed stablecoins
Each token is backed by real currency or highly liquid assets like short-term government debt, held in reserve by the issuer. This is currently the most widely used and most straightforward type to understand.
Crypto-backed stablecoins
These are backed by other cryptocurrencies held as collateral, usually over-collateralised to absorb price swings in the underlying assets. They are more decentralised than fiat-backed coins but carry more complexity and collateral risk.
Algorithmic stablecoins
These attempt to hold their peg through code and market incentives rather than holding real reserves. This category has a track record of failures where the peg broke down entirely, so it deserves the most caution of the three.
What Stablecoins Are Actually Used For
- A stable place to park value between trades, without converting all the way back to a bank account.
- Faster, cheaper transfers than some traditional banking rails, particularly for sending value abroad.
- A base currency inside DeFi, where they are widely used for lending, borrowing, and providing liquidity, as covered in our guide to how DeFi works.
The Risks People Underestimate
Depegging
A stablecoin can temporarily, or occasionally permanently, lose its peg during periods of market stress or if confidence in the issuer’s reserves is questioned. A depegged stablecoin is no longer behaving like cash and can lose value quickly.
Reserve quality and transparency
Not all issuers publish detailed, independently audited proof of what actually backs their tokens. Before relying on a stablecoin for anything beyond short-term trading, check whether the issuer publishes regular attestations of its reserves.
Counterparty and regulatory risk
You are ultimately trusting the issuer to honour redemptions. UK regulation of stablecoins is developing, with the FCA and Bank of England both involved in oversight of larger issuers, but protections are not yet equivalent to a bank deposit.
How to Buy Stablecoins Safely in the UK
- Use an exchange that is registered with the FCA. See our guide to checking whether a crypto exchange is legitimate before signing up anywhere unfamiliar.
- Stick to widely used, well-established stablecoins with a long track record of holding their peg rather than newer or algorithmic options.
- Move significant holdings into a wallet you control rather than leaving them on an exchange long-term. Our crypto wallets guide explains the options.
- Avoid platforms offering unusually high “yield” on stablecoin deposits, since this is a common way risk gets hidden behind a stable-looking price.
Frequently Asked Questions
Are stablecoins completely risk-free?
No. While designed to hold a steady value, stablecoins carry reserve, counterparty, and occasionally depegging risk that a bank deposit does not.
Are stablecoins covered by the Financial Services Compensation Scheme?
No. Stablecoins are not covered by the FSCS in the same way as money held in a UK bank account, regardless of how stable the price looks day to day.
Do I pay UK tax on stablecoin gains?
HMRC treats stablecoins as cryptoassets like any other, so disposals, including swaps into other tokens, can potentially trigger Capital Gains Tax if there is a gain, even though the price barely moves.
This article is for general information only and is not financial advice. Always research an issuer’s reserves and regulatory status before relying on any stablecoin.
