What is DeFi? Our Guide to Decentralized Finance

DeFi sits at the center of crypto, connecting wallets, exchanges, stablecoins, and on-chain liquidity. Read on to understand how it works, what people use it for, how it stacks up against traditional finance, and what risks demand your attention before you touch any of it.

What is DeFi?

DeFi is a financial ecosystem built on blockchain networks where users access services like trading, lending, borrowing, and earning yield through smart contracts. The smart contracts refer to code that automatically enforces rules, like borrowing criteria, without a central authority approving or denying anything.

Though the services mimic those of traditional finance systems, DeFi replaces the institutions or gatekeepers like banks, brokers, and payment processors with code deployed on a blockchain. So DeFi does not mean no rules. Rather, the rules are written and live in smart contracts instead of inside institutions.

DeFi is also not crypto in general but an aspect of it. Crypto is broad and includes assets like Bitcoin and Ethereum while DeFi refers to the financial applications that are built using blockchain technology. You can own Bitcoin without ever touching a DeFi protocol. But to participate in DeFi, you are almost always working within a blockchain ecosystem or crypto space.

How Does DeFi Work?

Here’s a step-by-step process of how DeFi works:

Step 1: Connect a crypto wallet

A crypto wallet is the starting point for anything in DeFi. It’s where you store your digital assets after purchase but it doesn’t hold your funds inside some company’s database like a bank account. Instead, you have direct access and control over your assets held on the blockchain. Each wallet is identified by a public address, and it is secured by a private key that only you should know. Once you connect a wallet to a DeFi application, you’re telling that app who you’re on-chain and authorizing interactions from that address.

Step 2: Choose a DeFi application

DeFi has several applications for different services. You’ll need to choose the service you want and then a specific decentralized application, or dApp. Options include:

• Decentralized exchanges for swapping tokens
• Lending platforms where you borrow against collateral
• Staking platforms that reward you for participating in network security
• Yield aggregators that automatically move your assets to find the best returns

Step 3: A smart contract executes the transaction

For a smart contract to trigger, you need to take an action whether that’s depositing into a lending pool or staking an asset. The smart contract then follows its pre-written rules automatically to execute the transaction.

Most of these activities run on the Ethereum network. That’s mainly because Ethereum smart contracts were the breakthrough that made programmable, decentralized apps possible at scale. Also, the network remains the largest home for DeFi applications today.

Step 4: The transaction is recorded on-chain

Every DeFi transaction gets written to the blockchain, which is a public, permanent, verifiable ledger. Anyone can look up a transaction, inspect a smart contract’s code (if published), or check how much value is sitting in a protocol at any given moment.

Step 5: Manage your assets and risk

Before, during, and after DeFi transactions, it’s your responsibility to manage the assets safely. If you approve a malicious transaction, there is no fraud department to call. If you lose your private key, there is no account recovery. Every protocol choice, approval click, and wallet interaction is your responsibility.

How DeFi Is Different From Banks and Crypto Exchanges

Traditional Finance (TradFi) is the system comprising banks, brokers, payment processors, clearinghouses, and insurance companies. The trust in TradFi is backed by regulation, deposit insurance, and legal recourse. But there are limitations like transaction speed, access to funds or services, and opacity into what they do with your money.

The closest resemblance to traditional finance in crypto is centralized finance (CeFi). It refers to platforms structured more like traditional financial companies. These include centralized crypto exchanges, brokerage apps, and custodial platforms. They offer access to crypto assets, but the platform holds your funds, manages your keys, and makes decisions about withdrawals, products, and access.

Then there’s decentralized finance where smart contracts replace the intermediary. You hold your assets in your own wallet and transactions execute 24/7, regardless of geography or identity. The safety of funds responsibility, though, shifts to the user.

Comparison Table:

Main DeFi Use Cases

Below is an overview of how people use DeFi:

• Decentralized exchanges: Users connect wallets, select the swap, and authorize the transaction directly.
• Lending and borrowing: DeFi lending protocols allow users to deposit crypto assets and earn interest, or borrow against crypto they already hold as collateral.
• Liquidity pools: These are collections of tokens deposited by users to facilitate trades or loans of a particular protocol. Users may earn a share of the fees generated by the pool.
• Yield farming: This is one of the most complex activities in DeFi as it involves moving assets between protocols to pursue the best available returns.
• Staking and liquid staking: Staking locks up your crypto assets to help secure a blockchain network, earning rewards in return. Liquid staking locks your assets but you get a liquid token, which you can then use elsewhere in DeFi.
• Stablecoin payments and trading pairs: Stablecoins are widely used in DeFi because they provide dollar-linked liquidity for trading, borrowing and settlement.
• Tokenized assets: DeFi lets people create digital representations of real-world assets like stocks, real estate, and bonds.

Why DeFi Became Popular

One of the main reasons why DeFi became popular and continues to grow is the open access and 24/7 availability. Anyone who has an internet connection and a crypto wallet can access DeFi any day including weekends and public holidays.

Another reason for DeFi’s popularity is transparency. If a dApp has publicly deployed smart contracts, anyone can vet it. They can check its transaction history and even the amount of capital inside it.

There’s also the user control aspect which means you hold your own assets in your own wallets. This means no platform can freeze your withdrawals and no company can go down with your assets.

Finally, smart contracts can interact with each other to create “money Legos.” The resulting financial products do not exist in traditional finance. For instance, a lending platform can connect with a stablecoin protocol that’s also connected into a yield aggregator.

Risks and Limitations of DeFi

Though DeFi is compelling and attracts those wanting to make money in crypto, it comes with risks such as:

• Smart contract risk: Code bugs can drain entire protocols instantly.
• Wallet security: Lose your private key or approve the wrong transaction and your funds are gone, permanently.
• Scams and phishing: Fake dApps, counterfeit tokens, and malicious links are constant threats.
• Liquidation risk: Collateral gets automatically sold if prices move against your position.
• Impermanent loss: Liquidity providers can end up worse off than simply holding their assets.
• Stablecoin depegging: When a stablecoin loses its dollar peg, it disrupts every market built around it.
• Oracle manipulation: Corrupted price feeds can be exploited to attack protocols.
• Bridge hacks: Moving assets across chains exposes you to some of DeFi’s most vulnerable infrastructure.
• Regulatory uncertainty: The legal landscape remains unsettled across most jurisdictions.

How Beginners Can Access DeFi Safely

Given the risks that come with DeFi, it’s important to start your journey with education. Learn everything from how wallets work and what a seed phrase is to what gas fees are and how they fluctuate. Fees tend to fluctuate based on network demand and Bitcoin network conditions. So, knowing how to read current network activity before transacting can save you money and prevent failed transactions.

Once well-equipped with knowledge, use reputable exchanges, particularly centralized ones, to buy initial assets. Your first transactions can be as small as the platform allows to help you test everything. Then store your crypto in a secure wallet and protect your seed phrase. A seed phrase is the master key to your wallet and anyone who has it can access everything in your wallet. For larger amounts of assets, hardware wallets, which store private keys on a physical device are a better option.

For any DeFi protocol you’re interested in, research it carefully first. Look for third-party security audits, which are basically reviews of a protocol’s smart contract code by specialized firms. Check how long the protocol has been running, the total value locked (TVL), and the team’s history or protocol governance. If a dApp offers unusually high yields, treat it as a warning sign.

Keep an eye on wallet permissions and approvals as well. Regularly review and revoke unnecessary token approvals to keep your assets safe in the wallet.

How DeFi Affects Ethereum and Crypto Markets

Ethereum is the network that made practical DeFi possible by introducing programmable smart contracts at scale. DeFi has since expanded to many other blockchain networks, but Ethereum remains the largest and most liquid DeFi ecosystem.

To use any DeFi protocol on Ethereum, users pay gas fees in ETH. This creates a direct link between DeFi activity and demand for ETH itself. Beyond fees, ETH is used as collateral in lending protocols, staked in staking-based DeFi products, and held in liquidity pools. So, Ether supply dynamics, meaning how ETH is issued, burned, staked, and circulated, are deeply intertwined with DeFi’s growth and activity patterns. A surge in DeFi usage usually increases demand for ETH.

DeFi is also connected with token markets. Most major DeFi protocols have their own governance tokens which give holders voting rights over protocol decisions. These tokens are traded on DEXs, used as collateral, and distributed as incentives to liquidity providers and early users.

Another way DeFi affects crypto markets is through stable coins. A surge in DeFi contributes to growth in stablecoin supply and activity while disruptions in stablecoin markets cause disruptions in DeFi markets. That’s because most DeFi trading pairs involve at least one stablecoin. For instance, some lending markets use stablecoins as borrowable assets or collateral and yield strategies settle in stablecoins.

Common DeFi Terms Beginners Should Know

Here is a quick reference for the terms you will encounter most frequently in DeFi.

• dApp: A decentralized application that’s built on blockchain technology instead of traditional financial platforms.
• DEX: A crypto exchange where users don’t need a central company to swap assets. It’s made possible by smart contracts which are pieces of pre-written rules for executing specific transactions.
• Smart contract: Code deployed on a blockchain that automatically executes transactions when its conditions are met.
• Liquidity pool: A collection of tokens deposited by users into a smart contract to enable decentralized trading, lending, or other financial activity. Users who deposit earn fees from the pool’s activity.
• Yield farming: The practice of strategically moving assets between DeFi apps to maximize returns. It involves multiple steps, reward tokens, and reinvestment strategies.
• Collateral: Assets pledged to secure a loan in DeFi.
• Gas fee: These are transaction costs that users pay for every trade on the Ethereum network.
• Oracle: A service that brings real-world data to blockchain for smart contracts to use.
• TVL (Total Value Locked): Tells us the total USD value of an asset deposited into decentralized finance (DeFi) protocols, staking, or liquidity pools. Hence, it indicates the size, adoption, and liquidity of that protocol.
• Impermanent loss: A temporary loss of value that occurs when the price of tokens in a liquidity pool changes compared to when they were deposited.
• Seed phrase: The 12 or 24 words that serve as the master backup for a crypto wallet.

Conclusion: What DeFi Means for the Future of Finance

DeFi is best described as an attempt to rebuild financial services on different foundations. The goal is to center the services on open blockchain networks, programmable smart contracts, and user-controlled wallets instead of institutions, intermediaries, and centralized custodians.

It can and does make finance more open, transparent and programmable. But it shifts more responsibility onto users and introduces risks that traditional financial systems handle differently. So, it’s important to understand the pros of the open infrastructure and risks of using code-based markets without traditional safety nets.