CEX (Centralized Exchange)
A CEX, or centralized exchange, is a crypto trading platform run by a company that holds custody of users' funds and matches their trades. Binance, Coinbase and Kraken are well-known examples.
How a centralized exchange works
You open an account, usually pass identity checks (KYC), and deposit money or crypto. From then on the exchange holds your assets in its own wallets and keeps track of your balance in an internal database. When you trade, the exchange matches your order against other users' orders in its order book. Most trades never touch a blockchain; only deposits and withdrawals do.
Why people use a CEX
Centralized exchanges are often the easiest bridge between bank money and crypto. They offer fiat deposits, fast order matching, deep order books for popular pairs, customer support and features such as limit orders, stop orders or derivatives. You do not need to manage keys or pay a network fee for each trade.
The trade-off: custody and trust
Because the exchange controls the private keys, you rely on it to stay solvent, secure and honest. This is counterparty risk. The collapse of FTX in November 2022, when the exchange could not meet withdrawal requests and filed for bankruptcy, showed what happens when that trust fails. Hacks of exchange wallets have also caused losses over the years.
Exchanges can also freeze accounts, pause withdrawals or restrict services in some countries, often because of regulation.
Reducing the risks
Use strong, unique passwords and app-based two-factor authentication, enable withdrawal address whitelists where offered, and check how the platform is regulated where you live. Many people keep only what they actively trade on an exchange and move longer-term holdings to a wallet they control. Proof-of-reserves reports can add transparency, but they do not always show all liabilities.
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Frequently asked questions
What is the difference between a CEX and a DEX?
A CEX is run by a company that holds your funds and matches trades. A DEX runs on smart contracts, and you trade directly from your own wallet without handing over custody.
Is my crypto safe on a centralized exchange?
It depends on the exchange's security, solvency and regulation. You do not hold the keys, so you depend on the company being able and willing to pay out.
Do I own the crypto I buy on a CEX?
You have a claim against the exchange for that balance. Legally and technically, the coins sit in wallets the exchange controls until you withdraw them.
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