What is a crypto exchange?
Where most people buy their first crypto, how cryptocurrency exchanges actually work, and the risks of leaving coins there.
A crypto exchange (cryptocurrency exchange, sometimes written "cryptoexchange") is a platform where you buy, sell and swap cryptocurrency. Centralized exchanges are companies that hold your money and crypto for you; decentralized exchanges (DEXs) are smart contracts you trade with directly from your own wallet. Neither is a bank, and crypto held on an exchange isn't covered by deposit insurance.
How a cryptocurrency exchange works
A centralized exchange runs an order book: a live list of offers to buy and sell a coin at different prices. When a buyer's price meets a seller's, the exchange matches them and updates both accounts in its own records. Most trades never touch the blockchain; only deposits and withdrawals do. The exchange makes money from trading fees, spreads, withdrawal fees and, often, lending or other services.
- Market order: buy or sell now at the best price available. Fast, but in a thin market you can get a worse price than you expected.
- Limit order: buy or sell only at a price you choose or better. It may never fill.
- Instant buy or "convert" button: the simplest screen, and usually the most expensive, because the price includes a spread on top of any fee.
Kinds of places that sell crypto
| Kind | What it is | Watch for |
|---|---|---|
| Centralized exchange | A company with an order book, accounts and ID checks | Company failure, frozen withdrawals, hacks |
| Broker or app | A company that sells you crypto at its own price, sometimes inside a stock or payment app | Wide spreads; some don't let you withdraw coins |
| Decentralized exchange (DEX) | Smart contracts that swap tokens from your own wallet | Fake tokens, contract bugs, harmful approvals |
| Peer-to-peer marketplace | A site that matches individual buyers and sellers | Payment fraud and fake buyers |
| Bitcoin ATM (kiosk) | A machine that turns cash into crypto | High fees, and heavy use in scams: no real agency or bank will ever tell you to use one |
Centralized vs. decentralized
| Compare | Centralized exchange (CEX) | Decentralized exchange (DEX) |
|---|---|---|
| How it works | A company matches buyers and sellers and holds funds | Smart contracts trade tokens from your wallet |
| Account | Sign-up with ID checks | No account; connect a wallet |
| Pay with dollars? | Yes: bank transfer or card | Usually no; you swap crypto for crypto |
| Who holds your funds | The exchange | You do |
| Main risk | The company fails, freezes withdrawals or is hacked | Smart contract bugs, fake tokens, bad approvals |
The full comparison, including how brokers differ from exchanges, is in CEX vs. DEX.
Why leaving coins on an exchange is a risk
When FTX collapsed in November 2022, customers lost access to their funds overnight. Crypto held on an exchange isn't a bank deposit and isn't protected by FDIC insurance. Many people buy on an exchange, then move larger long-term holdings to a wallet they control.
How to check an exchange is legitimate
- In the US, check that it's registered with FinCEN as a money services business and licensed in your state (your state's financial regulator lists licensees).
- Type the address yourself. Fake exchange websites and apps are a major scam; many "investment platforms" recommended by online friends are fake.
- Be suspicious of any platform that promises guaranteed returns, shows huge "profits" but charges fees or "taxes" before you can withdraw.
- Turn on app-based two-factor authentication (not SMS) and a withdrawal address allow-list if offered.
Fees
Expect a trading fee, a spread built into the price, and a fee to withdraw. The instant-buy button is usually the most expensive way to buy. See fees explained or calculate it with the true cost calculator.
Frequently asked questions
What does an exchange do in cryptocurrency?
It matches people who want to buy a coin with people who want to sell it, and holds both sides' money and coins while they trade. A DEX does the matching with smart contracts instead of a company.
Is a "cryptoexchange" different from a crypto exchange?
No. "Cryptoexchange", "crypto exchange" and "cryptocurrency exchange" all mean the same thing.
Are all cryptocurrency exchanges regulated?
No. Rules differ by country, and many offshore exchanges serve customers in places where they aren't licensed. In the US, check FinCEN registration and your state's license list. Lack of ID checks is a warning sign, not a feature.
Is my money insured on a crypto exchange?
Cash held at some US exchanges may be held at FDIC-insured banks, but the crypto itself isn't FDIC insured. Check the exchange's terms.
What is a DEX?
A decentralized exchange: a set of smart contracts that swap tokens directly from your wallet, with no company holding your funds.
Why did the exchange ask for my ID?
Regulated exchanges must verify customers' identity under anti-money-laundering rules. Be wary of 'exchanges' that never ask.
Where to next
Sources
Written for beginners and checked against the sources listed. Last reviewed November 5, 2026. This page is educational and is not financial, tax or legal advice. How we write and check pages.