What Is DeFi (Decentralized Finance)?

2026-10-01

DeFi (decentralized finance) is a set of financial services run by smart contracts on public blockchains. Instead of relying on a bank or broker to handle each transaction, users connect a wallet and deal directly with protocols to trade, lend, borrow, provide liquidity or seek yield.

How it works

DeFi uses smart contracts — self-executing agreements on a blockchain — to carry out financial activity like lending and trading without a bank or traditional institution in the middle [1]. It is typically transparent and "permissionless": anyone with a wallet can take part from anywhere in the world.

Main uses of DeFi

Use	What it does
Decentralized exchanges (DEXs)	Let users swap tokens directly through smart contracts
Lending and borrowing	Let users lend assets, or borrow against collateral
Liquidity pools	Pool assets from many users so others can trade against them
Yield farming	Puts liquidity or assets to work across protocols in search of rewards
Stablecoins	Let users move value on-chain with less exposure to the volatility of other crypto assets

DeFi vs traditional finance

The two systems differ in who sits in the middle.

Aspect	DeFi	Traditional finance
Intermediation	Smart contracts and protocols	Banks, brokers and other institutions
Access	A crypto wallet connected to the blockchain	An account approved by the institution
Hours	Around the clock	The institution's own hours
Custody	Self-custody: assets stay in the user's wallet or in smart contracts, not with an intermediary	Usually held by the institution or a custodian
Settlement	On-chain, once the transaction is recorded	Through clearinghouses, typically after a delay
Transparency	Transactions and contract code can be checked on-chain	Depends on the institution and the market
Main risks	Smart contracts, liquidity, oracles, stablecoins and keys	The institution, counterparty default and operational failures

Opportunities and risks

DeFi lets holders do complex financial operations — saving, lending, insurance — without an institution taking a cut [1]. But it carries risks too: smart contracts can have bugs, prices are volatile, and regulation is still evolving [2]. Loans can be liquidated when collateral falls, oracles can feed in wrong prices, stablecoins can lose their peg, and a user can sign the wrong transaction; running on-chain removes none of these risks [1][2]. Understand the risks before taking part.

Before you use a DeFi protocol

DeFi shifts responsibility from institutions to the user, so a few checks come before the first deposit [1].

Check which blockchain the protocol runs on, and use a wallet that supports it.
Move only the assets you plan to use into that wallet.
Read the protocol's audits and find out who can change its contracts.
Before you sign, check the network, the contract and the permissions the transaction asks for.
Start with a small amount and confirm that deposits and withdrawals work.

The bottom line

DeFi is an open financial system that runs on a blockchain and replaces traditional intermediaries with smart contracts. It brings openness and transparency, but also new risks. Understanding it is the first step to reading on-chain finance. To keep learning the fundamentals, follow more from Bitbase Academy.

Frequently asked questions

What is the difference between DeFi and CeFi?

CeFi, or centralized finance, describes firms that operate on blockchains but otherwise look much like traditional financial intermediaries [2]. In DeFi, smart contracts take the place of those intermediaries, and users can keep custody in their own wallets [2].

Is DeFi safe?

No protocol is guaranteed safe. Even audited protocols have suffered losses, and when a protocol fails or is exploited, users typically absorb the full loss, without the layers of customer protection that soften such losses in traditional finance [1].