A centralized exchange (CEX) is a crypto exchange operated by a single company that holds user funds in custody. Coinbase, Binance, Kraken, Bitstamp, and OKX are the dominant names in 2026.
How it works: - User deposits crypto or fiat into an account the exchange controls. - Exchange runs a fast, off-chain order-matching engine. - Users trade against other users on the order book. - Withdrawing moves funds from the exchange's on-chain wallet to the user's own wallet.
CEX advantages: - Fast execution (milliseconds, not blockchain-block-times). - Deep liquidity on major pairs. - Fiat on-ramp (bank transfer, card payment). - Mobile apps and customer support. - Regulated in most major jurisdictions — licenses mean some consumer protection.
CEX risks: - **Custodial risk** — if the exchange collapses (FTX in 2022, Celsius in 2023), users queue with creditors in bankruptcy. - **Regulatory risk** — exchanges can be compelled to freeze accounts, block jurisdictions, or delist tokens. - **Breach risk** — exchange hot wallets are attractive targets. Historical hacks include Mt. Gox, Coincheck, Bitfinex.
Rule of thumb: CEX for trading and on-ramping, self-custody for holding.