What Is a Crypto Exchange?

How It Works

Crypto exchanges function similarly to traditional brokerage platforms. You create an account, verify your identity (exchanges are required by law to collect Know Your Customer information), and connect a bank account or debit card. You can then deposit dollars, buy digital assets at the current market price, hold them in your exchange account, and later sell them back to dollars and withdraw to your bank.

There are two types of exchanges. Centralized exchanges (CEX), like Coinbase, Kraken, and Binance, are run by companies that hold your assets on your behalf — they are custodial. You trust the company to hold your funds safely. Decentralized exchanges (DEX), like Uniswap or Curve, are smart contracts running on public blockchains. There is no company in the middle — you connect your own non-custodial wallet and trade directly with automated liquidity pools. DEXs never take custody of your funds.

Exchanges make money in several ways: trading fees (usually 0.1 to 0.5% per trade), spreads between buy and sell prices, and interest on funds held in custody. The largest exchanges process billions of dollars in trades daily and have become significant financial institutions in their own right.

US-regulated exchanges are required to register as money service businesses, implement anti-money-laundering programs, and report suspicious activity to regulators. They are prohibited from serving users in countries subject to US sanctions.

Why It Matters

Exchanges are the essential bridge between the traditional financial system and the new digital one. Without them, most people would have no practical way to convert their bank dollars into digital assets or back. They are infrastructure — analogous to the foreign currency exchange booths at an airport, but global, instant, and available around the clock.

As the digital financial system matures, the role of exchanges is evolving alongside stablecoin adoption and DeFi growth.

Increasingly, traditional financial institutions — banks, brokerages, payment companies — are integrating digital asset capabilities directly into their existing platforms. As that integration deepens, standalone crypto exchanges may consolidate or specialize, much the way early internet service providers were eventually absorbed into broader tech ecosystems.

Real-World Example

A user in Denver wants to buy $500 of USDC to send to a freelancer in Mexico. She opens Coinbase, logs in, connects her checking account, and clicks 'Buy USDC.' The exchange debits her bank account $500, credits her Coinbase account with 500 USDC (minus a small fee), and the transaction completes in seconds. She then sends the USDC directly to the freelancer's wallet address from within the app.