CEX

A CEX, short for centralized exchange, is a trading platform operated by a company. You create an account, usually verify your identity, deposit crypto or fiat currency, and trade against an order book the company runs. The big, well-known exchanges where most people buy their first coins all follow this model.

When you deposit, your coins move to wallets the exchange controls, and your balance becomes an entry in the exchange's internal database. Trades between users are updated in that database rather than on the blockchain, which is why they are instant and carry no gas fee. Only deposits and withdrawals touch the chain. It also means you hold a claim on the exchange, not the coins themselves, because you do not control the private key.

For token buyers, a CEX offers things a DEX often cannot: fiat on-ramps, deep order books, tight spreads, and tools like limit orders, leverage, and perpetual futures. For small tokens, a CEX listing usually brings more visibility and volume than trading on a DEX alone. But the exchange decides what gets listed, and listing standards vary a lot between platforms. Many new tokens launch on a DEX first and only reach a CEX later, if ever.

The main risk is custody. Exchanges have been hacked, have frozen withdrawals, and have collapsed. The 2022 FTX failure is the best-known case of customer funds being used for something other than customer withdrawals. Keep only what you actively trade on an exchange, turn on two-factor authentication and a withdrawal address allowlist, and move long-term holdings to a wallet you control. Also expect identity checks, regional restrictions, and the possibility that a token gets delisted.

Two practical traps are worth knowing. When you withdraw or deposit a token, confirm the network and contract address, because sending on the wrong chain can mean lost funds. And on smaller exchanges, a new listing can show inflated or wash-traded volume with wide spreads, so look at the actual order book depth before trusting the numbers.