A CEX works much like an online brokerage. You create an account, usually pass identity checks, deposit money, and trade through the company's app or website. Behind the scenes the exchange holds the actual coins and matches buyers with sellers using an order book. For most people, a reputable CEX is the simplest on-ramp from ordinary money into crypto, which is why they dominate everyday trading.
The convenience is real: familiar interfaces, customer support, password resets, and often high liquidity so trades fill smoothly. But there is a fundamental trade-off. When your coins sit on a CEX, the company holds the keys, so your balance is effectively a claim on that business rather than crypto you directly control. The reminder not your keys, not your coins exists precisely for this situation.
History has shown why that matters, with several exchanges failing or freezing withdrawals over the years. A common, balanced approach is to use a trusted CEX for buying and selling, then move longer-term holdings into self-custody. Crypto House explains the trade-off; choosing a platform is your own decision, and not financial advice. The reputable, regulated platforms also tend to be the ones that complete identity checks and publish clear terms, which is worth weighing when choosing where to trade.
How to Buy Your First Crypto Safely
Key takeaways
- A CEX is a company you trade and store crypto through, holding your funds much like an online broker.
- It is convenient and beginner-friendly, with support, high liquidity and a familiar interface.
- Because the exchange holds the keys, your balance is a claim on the company, which carries counterparty risk.
Centralised Exchange (CEX) — questions fréquentes
Is it safe to keep crypto on an exchange?
An exchange is convenient, but it holds your keys, so your balance depends on that company staying solvent and open. History includes exchanges that failed or froze withdrawals, which is why many people self-custody longer-term holdings.
Why do people say you don't really control crypto held on an exchange?
Because a third party such as the exchange holds the private keys. Your balance is a claim on that company rather than the asset itself, captured in the saying not your keys, not your coins, which is a different kind of risk from holding it yourself.
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