Exchange
What Is a Crypto Exchange?
A crypto exchange is a marketplace where you convert fiat currency into digital assets, trade one cryptocurrency for another, or cash out your holdings back into fiat. Most people meet an exchange the moment they buy their first crypto assets, since crypto wallets do not generate crypto themselves. A wallet only stores the private keys that control assets already recorded on the blockchain.
Exchanges come in two main forms, centralized and decentralized. Both connect buyers and sellers, but they differ sharply in who controls your funds while a trade is underway.
Centralized vs Decentralized Exchanges: Who Controls Your Private Keys?
A centralized exchange, or CEX, is run by a single company that matches buy and sell orders on your behalf, similar to how a traditional stock exchange operates. To trade there, you deposit your crypto into an account the company controls, which means the exchange holds your private keys instead of you. This setup is fast and beginner-friendly, but it introduces counterparty risk: if the exchange is hacked, freezes withdrawals, or becomes insolvent, your funds can disappear along with it.
A decentralized exchange, or DEX, removes that middle step. Instead of a company-run order book, a DEX uses smart contracts and liquidity pools to execute trades directly from your own wallet. You connect a non-custodial wallet, sign the trade yourself, and keep control of your private keys throughout. The trade-off is that DEXs can carry smart contract risk and sometimes offer thinner liquidity for smaller tokens.
How Can You Trade Crypto Without Giving Up Custody?
Whether you use a CEX or a DEX, any crypto trade can bring some exposure to risk unless you take steps to limit that exposure. Keeping the bulk of your holdings on a signer (hardware wallet), moving only what you plan to trade onto an exchange, and practicing proper asset segregation helps keep the bulk of your portfolio protected when you trade.
What’s more, a signer requires physical confirmation for each transaction, so you can review the details of a swap, such as the destination address and amount, on the device screen before it goes through.
