What is a Crypto Exchange

What is a Crypto Exchange?

A crypto exchange is a marketplace where people can buy, sell and trade cryptocurrencies.

Just as traditional markets allow investors to trade financial assets, crypto exchanges provide markets for Bitcoin, Ethereum and thousands of altcoins.

Different exchanges work in different ways. Some are operated by companies that hold customer assets, while others allow users to trade directly from their own crypto wallets.

Two Types of Exchanges

Centralized Exchange (CEX)
A centralized exchange is operated by a company that provides the trading platform and manages customer accounts. Users typically deposit money or cryptocurrency into an account before trading.

Examples include Binance, Coinbase, Kraken and Bybit. Availability, services and regulatory requirements vary by country.

Centralized exchanges are often easier for beginners and can provide deep liquidity, but assets held in an exchange account are generally controlled through the exchange’s custody system rather than solely by your own private keys.

Decentralized Exchange (DEX)
A decentralized exchange allows users to trade through blockchain-based protocols, usually by connecting their own wallet. Trades can be executed using smart contracts rather than through a traditional centralized order-processing system.

Examples include Uniswap and PancakeSwap. Different decentralized trading platforms can use different designs, including liquidity pools and order books.

DEXs can give users greater control over their assets, but they also place more responsibility on the user. Wallet security, transaction approval, network fees and smart-contract risks all need to be understood.

How Does a CEX Work?

Step 1 — Create an account
Register with the exchange. Depending on the platform, service and jurisdiction, you may need to complete identity verification known as KYC — Know Your Customer.

Step 2 — Deposit funds
Fund your account using one of the methods supported by the exchange, such as a bank transfer, payment card or cryptocurrency deposit.

Step 3 — Choose a trading pair
Select the market you want to trade, such as BTC/USD, BTC/USDT or ETH/BTC.

Step 4 — Place an order
Choose whether you want to buy or sell, enter the amount and select the appropriate order type.

Step 5 — Order executes
On an order-book exchange, your order executes when it can be matched with compatible orders on the other side of the market. The exact execution depends on the order type and available liquidity.

Step 6 — Manage your assets
You can keep assets on the exchange for trading or withdraw them to a wallet you control. Each option involves different levels of convenience, responsibility and risk.

What is an Order Book?

Many centralized exchanges use an order book to organize open buy and sell orders for a trading pair.

• Bid — a price at which a buyer is willing to buy
• Ask — a price at which a seller is willing to sell
• Best bid — the highest currently available bid
• Best ask — the lowest currently available ask
• Spread — the difference between the best bid and best ask

When compatible buy and sell orders meet, the exchange’s matching system can execute a trade.

In a later topic, we will look more closely at how to read an order book and understand market depth.

What is Trading Volume?

Trading volume measures how much of an asset has been traded during a particular period, commonly over the previous 24 hours.

Higher trading activity can mean:

• More active buyers and sellers
• Better liquidity for entering and exiting positions
• Potentially lower price impact when placing orders

Lower trading activity can mean:

• Fewer active buyers and sellers
• Wider spreads or greater difficulty trading large amounts
• Larger price movements caused by relatively small orders

Volume is useful, but it should not be considered alone. Traders should also look at liquidity, spreads, order-book depth and the reliability of the exchange’s reported data.

Choosing a Safe Exchange

No crypto exchange is completely risk-free. Before depositing funds, research how the platform operates, where it is available and what protections it provides.

Look for:

• Clear information about the company operating the exchange
• Licensing or regulatory status relevant to the services and country where you use it
• Strong account-security features such as two-factor authentication
• A transparent security and incident history
• Sufficient liquidity in the markets you intend to trade
• Clear withdrawal procedures, fees and customer-support options
• Transparent information about custody and, where available, proof-of-reserves reporting

Proof of reserves can provide useful information about certain assets held by an exchange, but it should not be treated as a complete financial audit or proof that an exchange has no liabilities.

Be cautious of:

• Platforms with unclear ownership or company information
• Promises of guaranteed or unrealistic returns
• Unclear withdrawal rules or repeated reports of withdrawal problems
• Unexpected requests for private keys or seed phrases
• Websites or apps that imitate well-known exchanges

Keeping cryptocurrency on an exchange introduces custodial risk. If you withdraw crypto to your own wallet, you gain control of the keys — but you also become responsible for protecting them.

In the next topic we will learn about market orders, limit orders, stop orders and other order types used when trading cryptocurrency.