A centralized exchange (CEX) is a cryptocurrency trading platform operated by a company that acts as an intermediary between buyers and sellers. In many cases, the exchange also provides custody of customer assets, meaning users deposit crypto or fiat into accounts controlled by the platform while they trade.
How a CEX works
Most CEXs use an order book that matches bids and asks, similar to traditional stock exchanges. Users typically create an account, complete identity checks when required, and fund their exchange wallet via bank transfer, card payment, or crypto deposit. Once funds are on-platform, traders can place market and limit orders, convert between assets, and sometimes access additional services such as staking, lending, or derivatives. Because the exchange controls the matching engine and settlement process internally, trades can be fast and the interface is often designed for convenience.
Benefits and trade-offs
CEXs are popular because they tend to offer deep liquidity, straightforward fiat on-ramps and off-ramps, and customer support, which can make them approachable for newcomers. They also simplify tasks like recovering access, managing passwords, and executing frequent trades.
The key trade-off is trust. Since many CEXs custody user funds, customers rely on the platform’s security, internal controls, and solvency. This introduces risks such as account freezes, withdrawal limits, hacks, and operational failures. For this reason, some users withdraw assets to self-custody wallets after trading, especially for long-term holdings.
Understanding CEXs matters because they remain a primary gateway between traditional finance and crypto markets, shaping how people buy, sell, and access digital assets.