Crypto is everywhere: in headlines, on social media and in conversations at the pub. Some people have made fortunes; many more have lost money. Here’s a plain-English explanation of what it is, the biggest coins, and how to think about it sensibly.
This is general information, not financial advice, and I’m not recommending any coin. The FCA warns that if you buy crypto, you should be prepared to lose all your money.
What is cryptocurrency?
A cryptocurrency is digital money that isn’t issued by a government or bank. Instead, transactions are recorded on a blockchain: a shared, public ledger maintained by thousands of computers around the world. Cryptography keeps it secure, and each coin’s rules (such as how many will ever exist) are written into its code.
People buy crypto for different reasons: as a speculative investment, as a potential store of value, to use blockchain applications, or to move money across borders.
Ten of the biggest cryptocurrencies
Rankings change daily, but these are among the largest and best-known by market value:
| Coin | What it’s known for |
|---|---|
| Bitcoin (BTC) | The first and largest cryptocurrency; supply capped at 21 million coins |
| Ether (ETH) | Powers Ethereum, the biggest platform for blockchain apps |
| Tether (USDT) | A stablecoin designed to stay at one US dollar |
| XRP | Designed for fast, low-cost international payments |
| BNB | Linked to Binance, one of the largest crypto exchanges |
| Solana (SOL) | A fast blockchain popular for apps and trading |
| USD Coin (USDC) | Another dollar-backed stablecoin |
| TRON (TRX) | A blockchain widely used for stablecoin transfers |
| Dogecoin (DOGE) | Started as a joke; driven largely by online communities |
| Cardano (ADA) | A blockchain platform with a research-led approach |
Size doesn’t mean safety. A large market value can still fall fast.
Why volatility matters
Crypto prices can swing enormously. Bitcoin, the largest and most established coin, peaked at around $126,000 in October 2025, and in late September 2026 it was trading around $84,000, a fall of roughly a third in under a year. Smaller coins often move far more sharply, and some go to zero.
That’s why crypto should never hold money you need for bills, emergencies or anything in the next few years.
The risks to understand
- Volatility: falls of 50% or more have happened many times.
- Limited protection: most crypto isn’t covered by the FSCS or the Financial Ombudsman Service if an exchange collapses or you’re scammed.
- Scams: fake investment schemes, “guaranteed returns” and impersonation scams are common. If someone promises returns, walk away.
- Security: lose access to your wallet or exchange account and your coins may be gone for good.
- Tax: selling, swapping or spending crypto can create a Capital Gains Tax bill. Keep records of every transaction.
If you do buy crypto: keep it small
If you decide crypto has a place in your plans, a sensible order is:
- Emergency fund first: keep it in cash.
- Long-term investing next: your pension and a Stocks and Shares ISA in diversified funds.
- Then, only a small slice you could afford to lose completely.
Good to know: Use a platform registered with the FCA, turn on two-factor authentication, and never share your recovery phrase with anyone, ever. No genuine company will ask for it.
The short version
Cryptocurrency is digital money recorded on a blockchain. Bitcoin and Ether are the largest, alongside stablecoins like Tether and USDC. Prices are extremely volatile, protection is limited and scams are common. If you invest, only use money you could afford to lose entirely, keep it to a small portion of your wealth, and keep records for tax. Build your cash buffer and long-term investments first.
Common questions
Is crypto regulated in the UK?
Only partly. Crypto firms serving UK customers must register with the FCA for anti-money-laundering purposes, and crypto promotions must follow FCA rules. But most crypto investments aren't covered by the Financial Ombudsman Service or FSCS if things go wrong.
Do I pay tax on crypto?
Usually, yes. HMRC treats most crypto as an asset, so selling, swapping or spending it can trigger Capital Gains Tax on any profit above your annual exempt amount (£3,000). Keep records of every transaction.
How much of my money should be in crypto?
This isn't advice, but the FCA's warning is clear: be prepared to lose all the money you put in. For most people, that means a small percentage at most, and only after building an emergency fund and investing for retirement.
What's a stablecoin?
A stablecoin, such as Tether (USDT) or USD Coin (USDC), is designed to hold a steady value, usually one US dollar. Stablecoins are mainly used for moving money around crypto markets, not for growth.
This article is general information, not personal financial advice. Your situation is your own, so check the details for yourself or speak to a regulated adviser before making big decisions. Where investments are mentioned, their value can go down as well as up.
