Decentralized finance, or DeFi for short, is a set of financial services, such as lending, borrowing, and trading, that run on public blockchains instead of through banks or brokerages.
A blockchain is a digital record of transactions that is securely copied across multiple computers at once. This helps ensure that no single company, bank, or government is in control.
DeFi services run on smart contracts, which are computer programs stored on a blockchain that automatically carry out the terms of an agreement once certain conditions are met.
If you pay for something with a credit card or send money to someone through an app, those services require a third-party, like a bank or payment service. DeFi’s goal is to eliminate the middleman and enable direct peer-to-peer transactions.
Why DeFi Matters to You
DeFi apps are open 24 hours a day, every day. Most anyone with an internet connection and a compatible crypto wallet can use them with no credit check, account approval, or minimum balance.
Every transaction is recorded publicly on the blockchain, so anyone can verify balances and transactions.
That convenience, speed and openness are part of DeFi’s appeal. You can earn interest, take out a loan, or swap one asset for another in minutes, often without the fees charged by a financial services company.
The tradeoff is that the same features that can eliminate the middleman also remove many of the protections an institution like a bank provides. That’s why the risks of DeFi deserve as much attention as the benefits.
How Does DeFi Work?
To use DeFi, you need a crypto wallet, which is an app that stores the private keys, or secret codes, that give you control of your crypto.
You connect your wallet to a DeFi app's website, review the transaction, and approve it.
Each transaction usually costs a gas fee, which is a payment to the blockchain for processing it. It can range from a few cents to several dollars depending on the blockchain and how busy it is.
Much of DeFi runs on stablecoins, a type of cryptocurrency designed to keep a steady value, often by tying its price to a traditional currency like the U.S. dollar. Because their prices are meant to remain steady, stablecoins act as the everyday cash of DeFi.
What Can You Do With DeFi?
Most DeFi activity falls into a handful of categories that mirror familiar banking services.
Trade on a Decentralized Exchange
A decentralized exchange, or DEX, lets you swap one crypto for another directly from your wallet without an intermediary and often without having to confirm your identity. It’s one of the most widely used forms of DeFi for crypto holders.
Lend Your Crypto for Interest
Lending apps may let you deposit crypto into a shared pool that borrowers draw from, and you earn interest on what you supply. Rates rise and fall with demand, so the yield you see today is not guaranteed.
Borrow Against Your Crypto
If you have enough cryptocurrency to put up as collateral, you may be able to borrow other crypto. DeFi loans typically require more collateral than the amount of your loan.
Provide Liquidity
You can add your own cryptocurrency to a liquidity pool and collect a share of the fees traders pay. But if the prices of the assets in the pool shift sharply, you can end up with less value than if you’d simply held onto them.
How a DeFi Loan Plays Out
Imagine you own $2,000 worth of bitcoin and want $1,000 in cash without selling it. You deposit the bitcoin into a lending app as collateral and borrow $1,000 of a stablecoin, so your loan equals 50% of your collateral's value.
If bitcoin’s price falls 40%, your collateral drops to $1,200, and your $1,000 loan now equals about 83% of your collateral’s value.
If the loan crosses the limit set in the app's rules, the smart contract automatically sells some of your bitcoin to repay the debt. The process is called liquidation, and it usually comes with a penalty.
No one calls to warn you or offers extra time, because the code simply follows its instructions.
Is DeFi Just a Bank Without the Fees?
Money in a U.S. bank is insured up to $250,000 per depositor, per bank, but the Federal Deposit Insurance Corporation does not insure crypto assets.That includes anything you hold in a DeFi app.
There’s also no customer service line, no fraud department, and no way to reverse a transaction you approved by mistake.
DeFi isn’t always cheaper either. Gas fees during busy periods can cost more than a bank wire for a small transfer.
WhileDeFi can offer access and speed that banks don’t, it asks you to take on much of the security work yourself.
What Are the Biggest Risks?
The technology behind DeFi is relatively new, and regulators are still catching up with it. It’s also borderless, so financial crimes that occur across different states and countries can be difficult to investigate and prosecute.
Since DeFi lacks many of the consumer protections built into traditional financial services, users should take its risks seriously.
Coding Flaws and Hacks
If someone writes bad code, a smart contract can malfunction or be exposed to security vulnerabilities. Hackers search for weaknesses to exploit so they can steal users’ funds.
Rug Pulls
A rug pull happens when the creators of a cryptocurrency or app hype it up, attract investors, and then disappear with the money. New projects that promise unusually high, steady returns deserve the most suspicion.
Stablecoins Losing Their Peg
Stablecoins can lose their value in what’s known as a depeg. If a bank fails while holding a portion of the dollars backing a stablecoin, that loss of access to reserves can contribute to a depeg. This can have ripple effects throughout a DeFi network.
Lost Keys
If you lose the private keys or recovery phrase for a wallet, no one can restore your access, and the funds are effectively gone for good.
How to Start Safely
Stick to large, long-running apps that have published independent security audits, but treat even those as risky rather than safe.
Write down your wallet's recovery phrase on paper and store it somewhere secure offline. Never type it into a website or share it with anyone claiming to offer support.
Finally, only put in money you could afford to lose entirely. DeFi may one day be an integral part of the global financial system, but for now it’s a young technology with significant risks.
