DeFi for Beginners: What Decentralised Finance Actually Means

A friend mentions, casually, that they're earning 12% a year on their USDT "in DeFi". You nod, but two questions are probably forming. What exactly is DeFi? And who is paying that 12%?

Both are good questions, and the second one is the one that keeps people out of trouble. This post answers both.

DeFi in one paragraph

Traditional finance runs through companies. A bank holds your money, an exchange matches your trades, a lender decides whether you qualify for a loan. Decentralised finance replaces those companies with smart contracts: programs on a blockchain that run exactly as written. Anyone with a wallet and an internet connection can use them, at 3am on a public holiday, without opening an account or showing ID. That openness is the attraction. It's also the risk, because there's no customer care line when something goes wrong.

The four building blocks

1. Your wallet

You use DeFi through a non-custodial wallet, such as a browser extension or a wallet app, where you hold the seed phrase. Connecting that wallet to a DeFi site is how you "sign in", and every action is a transaction you approve yourself.

Each transaction costs a network fee, paid in the network's own coin: ETH on Ethereum, BNB on BNB Smart Chain, and so on. Run out of that coin and you're stuck, even with plenty of USDT. If the difference between this kind of wallet and an app account is new to you, read custodial vs non-custodial wallets.

2. Stablecoins

Most DeFi activity runs on stablecoins, tokens designed to track a currency, usually the US dollar. They aren't all built the same way:

• Reserve-backed, such as USDT and USDC, backed by assets held by the company that issues them.
• Crypto-backed, kept stable by crypto locked in smart contracts, usually worth more than the stablecoins issued against it.
• Algorithmic, trying to hold their peg with code and incentives alone. Several of these have collapsed completely in the past.

Knowing what stands behind your stablecoin is part of knowing your risk.

3. Decentralised exchanges

A decentralised exchange (DEX) lets you swap one token for another straight from your wallet. Most use liquidity pools: pots of two tokens supplied by users, who earn a share of the swap fees. Prices move as people trade against the pool, so big trades in small pools get a worse price.

Supplying liquidity comes with its own catch, impermanent loss, which we explain with worked numbers in liquidity pools explained.

4. Lending and borrowing

Lending protocols pool deposits from lenders and let borrowers take loans against collateral. Because nobody checks your credit history, loans are overcollateralised: you might lock $150 of ETH to borrow $100 of USDC (figures for illustration only).

If your collateral's value falls too far, the protocol sells it automatically to repay the loan. That's called liquidation, and it usually comes with a penalty. Borrowing in DeFi suits people who want cash from a coin without selling it, or who want leverage. It's a poor way to raise money for rent.

Where the yields come from

Every yield is paid by someone. In DeFi, the usual sources are:

• Borrowers, paying interest to lenders. Rates rise when lots of people want to borrow and fall when they don't.
• Traders, paying swap fees to liquidity providers.
• New tokens. Protocols create their own tokens and hand them out to attract deposits. This is often the biggest part of an eye-catching yield and the least reliable, because the token's price tends to fall as people sell their rewards.
• Risk. A higher yield often means you're being paid to take a risk others won't: a new protocol, an untested token or a complicated strategy.

So back to your friend's 12%. Ask which of these is paying it. If they can't say, or the honest answer is "new people's deposits", that isn't DeFi. It's a Ponzi scheme wearing DeFi's clothes.

Where beginners get hurt

1. Signing what they don't understand. Wallet drainers trick you into approving a contract that can empty your tokens later. Learn how to revoke token approvals before you start, not after.
2. Fake sites and fake support. A link from a DM, an advert or a helpful stranger leads to a copy of a real site. Bookmark the real ones and use only the bookmarks.
3. Sharing the seed phrase. No protocol, airdrop or support team ever needs it. Anyone who asks is trying to steal from you.
4. Chasing the biggest number. New pools advertising huge yields are where rug pulls happen. Read what a rug pull is before you chase one.
5. Trusting the word "audited". Audits lower the risk of a code bug. They don't remove it, and audited protocols have been exploited.
6. Bridges. Moving tokens between blockchains adds another contract that can fail, and bridges have been the target of some of the largest hacks in crypto.
7. Borrowing and forgetting. A sharp price drop overnight can liquidate a loan while you're asleep.
8. Fees on small amounts. On a busy network, approving, depositing and withdrawing can cost more than a small deposit ever earns.

If you want to try it

Go slowly and keep it small:

• Use a separate wallet for DeFi, with its own seed phrase, holding only what you're experimenting with.
• Start with long-established protocols, reached through bookmarked links.
• Read the protocol's own documentation on how its yields are generated and what can go wrong.
• Try one thing at a time with an amount you could lose without it hurting: a single small swap first, then a small deposit.
• Write down every transaction, including fees, so you can tell whether you're actually ahead.

This is general education, not financial advice.

Where KWIQ fits

KWIQ isn't a DeFi platform, and you don't need DeFi to hold USDT or to turn crypto into naira. Plenty of people use both. They experiment in DeFi with a separate wallet, and when they want naira, they swap into a coin KWIQ supports, send it to their KWIQ wallet on the network the app shows, and sell with zero fees, seeing the rate and the naira amount before they confirm.

If DeFi is the classroom, you'll want a dependable way back to naira for when class is over. Download the KWIQ app and have it ready before you need it, or create a free account on the web if your phone is already crowded with wallet apps.