What Is DeFi? Decentralised Finance Explained Simply
DeFi lets you lend, borrow, and earn yield on crypto without a bank. Here’s how it works, the main protocols, and the risks UK investors need to understand.
Decentralised finance — DeFi — is a collection of financial services built on blockchain networks, primarily Ethereum. These services include lending, borrowing, trading, and earning yield, all executed by software (smart contracts) rather than banks, brokers, or other financial intermediaries. In 2026, DeFi protocols collectively handle over $100 billion in assets.
How DeFi Works
Traditional finance requires trusted intermediaries — banks hold your deposits, brokers execute your trades, insurance companies underwrite your policies. Each intermediary takes a fee, requires KYC verification, and can freeze or restrict your access.
DeFi replaces intermediaries with smart contracts — code that automatically executes financial transactions when conditions are met. A DeFi lending protocol, for example, automatically calculates interest rates, accepts collateral, and releases loans without any human involvement or approval process.
Key DeFi Applications
Decentralised exchanges (DEXs): Platforms like Uniswap and Curve allow users to swap tokens directly from their wallets, without depositing funds with an exchange. Prices are set algorithmically based on the ratio of assets in liquidity pools.
Lending protocols: Aave and Compound allow users to deposit crypto as collateral and borrow other assets against it. Interest rates adjust automatically based on supply and demand. No credit check required — your collateral secures the loan.
Yield farming: Users provide liquidity to DEX pools and earn a share of trading fees in return. Yields vary widely — from a few percent annually to extremely high rates that typically reflect high risk.
The Risks of DeFi
DeFi carries risks that traditional finance does not. Smart contract bugs can be exploited by hackers — billions of dollars have been stolen from DeFi protocols through code vulnerabilities. There is no FSCS protection, no customer service, and no way to reverse transactions. Regulatory status of DeFi in the UK is still developing.
Impermanent loss is another risk specific to liquidity provision: if the relative price of the assets in a liquidity pool changes significantly, you can end up with less value than if you had simply held the assets.
Is DeFi Regulated in the UK?
The UK’s approach to DeFi regulation is still developing. The FCA has flagged DeFi as an area requiring attention in its crypto roadmap. Fully decentralised protocols (with no central operator) present significant regulatory challenges. UK investors using DeFi protocols should be aware they are operating in an area with limited regulatory protection.
Should UK Investors Use DeFi?
DeFi offers genuine innovation — access to yield, liquidity, and financial services without intermediaries. But it requires technical knowledge, carries significant risks, and offers no regulatory protection. It is not appropriate for beginners or those who cannot afford to lose their entire investment.
If you want exposure to the DeFi ecosystem, holding ETH on an FCA-registered exchange is a simpler, lower-risk entry point than using DeFi protocols directly.
This article is for educational purposes only and does not constitute financial advice. DeFi investments carry significant risk. Always do your own research.
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