A crypto exchange, or cryptocurrency exchange, is a platform that enables users to buy, sell, and trade cryptocurrencies for fiat currencies or other digital assets.
Exchanges provide pricing, liquidity and trading tools for crypto assets. Some match buyers and sellers directly, while others use liquidity pools and automated market makers. Many also offer additional services such as wallets, staking, lending, or card products.
How a crypto exchange works
At a high level, a crypto exchange connects people who want to buy crypto with people who want to sell it, and it provides the infrastructure to execute those trades.
Account creation and funding
Users typically:
- Register an account.
- Complete identity verification (KYC/AML) where required.
- Deposit fiat currency (for example, via bank transfer or card) or crypto assets from an external wallet.
These deposits become the balance the user can trade with on the platform.
Order placement and matching
Many exchanges use an order book model:
- Buy orders show the prices and amounts buyers are willing to pay.
- Sell orders show the prices and amounts sellers are willing to accept.
- The exchange’s matching engine pairs compatible buy and sell orders and executes trades.
- When a buyer’s bid matches a seller’s ask, a trade occurs at the agreed price and the exchange updates both users’ balances.
Other exchanges, especially some decentralized exchanges, use automated market makers (AMMs) and liquidity pools. In this model, users swap tokens against a pool of assets rather than trading directly with another user. Prices are determined by a formula based on the pool’s balances, and trades are executed by smart contracts on-chain.
Settlement and custody
On a centralized exchange, trades are usually settled internally on the platform’s ledger. Assets may be held in custodial wallets controlled by the exchange on behalf of users.
On a decentralized exchange, trades are executed on-chain through smart contracts, and users often retain control of their assets in their own wallets.
Withdrawals
After trading, users can:
- Keep assets on the exchange.
- Withdraw fiat to a linked bank account.
- Withdraw crypto to an external wallet address.
Withdrawal rules, limits, and fees depend on the exchange and applicable regulations.
Centralized vs decentralized exchanges
The two main categories of crypto exchanges differ in control, custody, and user experience.
| Feature | Centralized exchange (CEX) | Decentralized exchange (DEX) |
| Operator | Run by a company or entity | Run by smart contracts and protocols |
| Custody of assets | Often custodial; exchange holds user funds | Typically non-custodial; users keep funds in their own wallets |
| Identity verification | Usually requires KYC/AML | Often permissionless, no KYC (though this varies) |
| Trading mechanism | Order book or internal matching; some also support AMM-style pools | Automated market makers (AMMs), liquidity pools, or on-chain order books |
| Fiat on/off-ramps | Common (bank transfer, card) | Less common; often crypto-to-crypto only |
| User experience | Generally simpler, more support | Can be more complex; requires wallet management |
| Regulatory oversight | More likely to be regulated | Varies; often less direct oversight |
Both models have trade-offs. CEXs often offer convenience, liquidity, and customer support but require trust in the operator. DEXs offer more direct control and permissionless access but place more responsibility on the user.
What users can do on a crypto exchange
Typical activities include:
- Buying crypto with fiat
Using bank transfers, cards, or other payment methods to purchase crypto. - Selling crypto for fiat
Converting crypto holdings back into fiat and withdrawing to a bank account. - Trading crypto-to-crypto
Swapping one cryptocurrency or token for another (for example, BTC for ETH). - Using advanced trading tools
Some exchanges offer margin trading, futures, options, staking, lending, or automated strategies. - Accessing additional services
Examples include earn products, NFT marketplaces, launchpads, or integrated wallets.
Not all exchanges offer all features. Users should check which services are available in their region and which assets are supported.
Fees and pricing on exchanges
Exchanges may charge various types of fees:
- Trading fees
A percentage of the trade value, often split between maker and taker. - Deposit and withdrawal fees
Charges for moving fiat or crypto in and out of the platform. - Conversion or spread costs
The difference between the quoted price and the underlying market price. - Network fees
Blockchain transaction fees for on-chain withdrawals or deposits. - Other service fees
For example, staking fees, lending fees, or inactivity fees, depending on the platform.
Users should review the fee schedule and understand how fees affect their effective price, not just the headline commission rate.
Security and risk considerations
Crypto exchanges hold or interact with valuable assets, so security and operational risk are important.
Common risks
- Platform risk
The exchange could suffer a hack, operational failure, or insolvency. - Custody risk
On custodial platforms, users rely on the exchange to safeguard their assets. - Regulatory risk
Changes in regulation may affect services, asset availability, or access in certain regions. - User error
Sending assets to the wrong address, falling for phishing, or mismanaging private keys.
Good practices for users
- Use strong, unique passwords and enable two-factor authentication.
- Withdraw long-term holdings to a secure wallet, especially for larger amounts.
- Verify withdrawal addresses carefully and use allowlists where available.
- Be cautious with unknown links, support messages, or “too good to be true” offers.
- Understand which assets are supported on which networks to avoid misdirected transfers.
No setup is completely risk-free, but these practices can reduce exposure.
Crypto exchanges and card products
A crypto exchange may be connected to a crypto card product in several ways:
- The exchange may offer its own card that draws on the user’s exchange balance.
- A separate card programme may integrate with one or more exchanges for collateral, funding, or conversion.
- Users may move assets between an exchange and a wallet that is linked to a card product.
In such setups, it is important for users to understand:
- Where their assets are held (exchange account, wallet, or card programme).
- Which balances are available for spending or collateral.
- How conversions between crypto and fiat are priced (including any spread or fees).
- What happens in case of exchange downtime, withdrawal limits, or trading restrictions.
Clear separation between exchange, wallet, and card layers helps users reason about risk and availability.
