Regulators are rabidly pursuing bills and orders that position America to be the leading innovators and adopters of cryptocurrency, especially stablecoins. The excitement is centered around easy payment systems, privacy improvements, and the incredible returns coins like Bitcoin have had recently. These factors are all a huge piece of the crypto puzzle. However, the piece that isn’t talked about enough is decentralized finance. It is a beautiful network of protocols, wallets, and coins all built on top of a blockchain. This essay will speak to the fundamentals of decentralized finance as they will be vital as more users explore this world teeming with life and returns. To do this, it will first address the purpose of decentralized finance and why it is so impactful. Next, it will go over some of the components that make this network function. Then, it will go into three of the most important protocols in decentralized finance: staking, decentralized exchanges, and lending.
To begin, the importance of Decentralized Finance (DeFi) must be established. DeFi is a network that allows users to break away from the common centralized form of finance that people have become so accustomed to. DeFi does this by leveraging a peer-to-peer system, just like most cryptocurrencies. This P2P system empowers users to manage risks just like a bank would. To expound, the P2P system creates an environment where loans, for example, are two-sided, with the lender being a regular person along with the borrower. Eliminating the centralized bank that issues all of the loans means that everyone is on an equal playing field. This is the beauty of DeFi. A person can borrow just as they always have, but now a whole new world of lending, liquidity providing, and yield farming is opened to the common person, a world which previously only banks and institutions could live in.
So, how does it work? DeFi has many complexities and a person could spend years learning to master the space. However, the principles of DeFi make quite a lot of sense. To break it down, DeFi has five major components to ensure the system runs smoothly: blockchain networks, smart contracts, decentralized applications (dApps), crypto wallets, and stablecoins.
Blockchain networks: These are the underlying distributed ledgers that record all transactions and smart contract data. Examples are Ethereum, Solana, and XRP Ledger.
Smart Contracts: These are self-executing digital contracts with the terms of the agreement directly written into code. These are the backbone of financial transactions in DeFi; they are immutable, distributed on the blockchain, and execute automatically when certain parameters are met.
Decentralized Applications: These are the user-facing applications that interact with smart contracts on the blockchain. These are what people think of when talking about DeFi platforms like lending, decentralized exchanges, and staking.
Crypto Wallets: These are essential for users to interact with DeFi protocols. Unlike traditional banks, crypto wallets allow users to maintain full control and self-custody of their assets by managing their private keys. They enable users to hold, stake, send, and receive cryptocurrencies, and act as a login to DeFi dApps.
Stablecoins: These are cryptocurrencies designed to maintain a stable value, often pegged to fiat currencies (like the US dollar), a basket of assets, or commodities. These coins are a particular focus of the GENIUS Bill.
All of these components work together to create the DeFi network. How that works is demonstrated well through an example. A user (anybody in the world) first must make a crypto wallet. While the user might buy their crypto from a marketplace like Coinbase or Binance, these are not the wallets that interact with DeFi. Instead, they will have to make a Web3 wallet on a platform like MetaMask. They will then transfer funds into that wallet. The wallet has a long string of numbers and letters called an address; these addresses are public and are the identifier for any person or program to receive or send money to your wallet. Next, say the user wants to lend money on the network, they will go to a dApp simply by looking it up on a browser; a popular lending site is Aave. They will connect their wallet to Aave by clicking a button on the website and following one or two prompts. Next, they will browse Aave until they find a coin they would like to lend, let's say they want to lend the stablecoin USDC. They will choose their position size and confirm the transaction by signing off on their wallet. This is where the magic of smart contracts comes into play, and the parameters are set for the user's position. In the case of Aave, the user’s stablecoins will go into a liquidity pool; they will receive a coin called aUSDC in their wallet to represent their lending position. That aUSDC balance will automatically grow over time (the work of smart contracts) to represent the interest received. Finally, at any time the position can be withdrawn, and the person receives their new sum of USDC for their next DeFi adventure.
Now that an understanding of how the DeFi world works has been established, the three dApps that a user is most likely to run into deserve an explanation.
Decentralized Exchanges (DEXs): Imagine you want to swap one type of cryptocurrency for another (like trading your USDC for Ethereum). A DEX is like a digital marketplace where you can do this directly with other people, without a middleman like a traditional bank or a big company running the exchange. It all happens automatically using smart contracts. Instead of having a company hold all the money, people put their crypto into liquidity pools on the DEX. When you want to trade, the DEX uses these pools and a smart contract to automatically swap your crypto for the one you want, based on the current price. Users that provide currency to a liquidity pool earn a portion of the fees that the DEX charges, which can lead to some very impressive yields. (Ex. PancakeSwap, Uniswap, dYdX)
Staking Protocols: Many blockchains like Ethereum use a validation process called proof-of-stake. Proof-of-stake works by forcing people to lock up a certain amount of a coin; in return, they can be chosen to validate transactions that happen on the blockchain. Their locked-up coin is what incentivizes them to act in good faith when validating because being wrong can cause them to lose their staked crypto. dApps have made this more accessible to users by pooling users' balances and performing the staking functions for them, rewarding them with an attractive yield and much more flexibility on how long their crypto is staked. It is worth mentioning that growing dApps like EigenLayer allow users to restake their already staked coins. (Ex. Lido)
Lending Protocols: This is like a decentralized bank where you can either lend out your cryptocurrency to earn interest, or borrow cryptocurrency by putting up some other crypto as collateral. No traditional bank is involved; it's all handled by smart contracts. For Lenders: You deposit your crypto (like USDC) into a "lending pool." People who want to borrow from this pool will pay interest, and a portion of that interest goes to you for lending your crypto. Your deposited crypto might even grow automatically in your wallet (like with Aave's aUSDC, where your quantity of aUSDC tokens increases). For Borrowers: If you want to borrow crypto, you have to put up more crypto as "collateral" than the amount you want to borrow (e.g., if you want to borrow $100 in USDC, you might need to put up $150 worth of Ethereum as collateral). This ensures the lender is protected if you don't pay back your loan. If the value of your collateral drops too much, the protocol might automatically sell some of it to repay the loan.
Decentralized Finance is an incredibly exciting industry with many ways people can take control of their finances and earn money while doing it. Importantly, there are risks. Gas fees are the cost to make transactions across a blockchain and can get pretty steep, especially on crowded networks. If you want to actively participate in DeFi, it is worth looking into Layer 2 chains like Arbitrum or Base, which will dramatically decrease your transaction costs. Second, impermanent loss is a significant problem in crypto. When putting money into protocols, keep in mind that some coins are volatile, and you are not protected from the value fluctuations just because your coin is being deployed in a dApp. Furthermore, it is critical to use trusted sites when participating in DeFi; it is still the internet, and there are still malicious people. The site DeFi Llama is a great resource to see a protocol's total value locked (TVL), which can tell you a lot about how trustworthy it is. DeFi Llama also has great insights into different protocols and data about yields across the landscape that can be leveraged to find the best investment opportunities.
To be sure, cryptocurrencies have the opportunity to change the world. With regulation and proper usage, people can be empowered to engage with money on a level of control and personability that they might have never thought was possible. As with anything, there are risks and bad actors, but those can be easily avoided with good judgment and prudence in research. Hopefully, this paper provided a good starting point to teach and inspire you. Payments and privacy are nice, yet the fascinating world of DeFi provides the depth, beauty, and opportunity in crypto that is not talked about enough.