Crypto Exchanges
Learn how centralised and decentralised crypto exchanges work, how orders are matched or routed, and which liquidity, custody and execution risks matter.
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This lesson focuses on how this participant or function fits into the wider crypto market rather than treating crypto as a single, uniform marketplace.
Last reviewed: 20 August 2026
- What a crypto exchange is
- CEX vs DEX
- Trading mechanics
- Custody & settlement
- How to evaluate a venue
- Common mistakes
- Checkpoint
- FAQ
- Summary
Where this fits in the crypto ecosystem
What is a crypto exchange?
A crypto exchange is a venue or system where users can exchange cryptoassets, fiat currency, stablecoins or derivatives. The term covers very different structures, so the first question is whether the venue is centralised or decentralised.
Centralised exchanges vs decentralised exchanges
| Feature | Centralised Exchange (CEX) | Decentralised Exchange (DEX) |
|---|---|---|
| Custody | Often holds customer assets or controls withdrawal infrastructure. | Users commonly interact through self-custody wallets. |
| Trading mechanism | Usually an internal order book and matching engine. | Often automated market makers, on-chain order books or aggregators. |
| Identity checks | May require KYC depending on jurisdiction and service. | Protocol access may be wallet-based, though interfaces and legal obligations can still vary. |
| Settlement | Many trades are recorded internally before withdrawal. | Trades settle through smart contracts and blockchain transactions. |
| Main operational risk | Counterparty, custody, insolvency, cyber and withdrawal risk. | Smart-contract, oracle, MEV, bridge, wallet and network risk. |
How an exchange turns orders into trades
CEX order books
Buy and sell orders are ranked by price and usually time priority. A matching engine executes compatible orders. The displayed order book is therefore a snapshot of available quoted liquidity.
DEX liquidity
Many DEXs use liquidity pools and pricing formulas rather than a traditional central order book. Traders interact with smart contracts, and the trade can move the quoted pool price.
Why custody structure matters
On a centralised exchange, your account balance is typically a claim on the exchange's internal ledger until assets are withdrawn on-chain. On a decentralised venue, you often retain wallet control but take on smart-contract and transaction-execution risk.
- Check supported networks before depositing or withdrawing.
- Understand whether assets are segregated, rehypothecated or used as collateral.
- Do not confuse proof of reserves with a complete audited balance sheet showing all liabilities.
- Consider withdrawal limits, maintenance windows and jurisdictional protections.
What traders should evaluate in an exchange
Liquidity & execution
Spread, depth, slippage, market impact, uptime and order types.
Counterparty & custody
Asset controls, withdrawal reliability, security history and legal entity.
Fees
Maker/taker fees, withdrawal fees, network costs and hidden conversion spreads.
Product complexity
Spot, margin, derivatives, staking and lending create different risk profiles.
💡 Example
An exchange may advertise a 0.10% trading fee, but a thin order book can create 0.60% slippage on a large order. The headline fee is therefore only one part of total execution cost.
⚠️ Common misunderstandings
- "A large exchange cannot fail." Size does not eliminate insolvency, fraud, cyber or legal risk.
- "DEX means no risk." DEX users trade counterparty risk for smart-contract, wallet and network risks.
- "Exchange price equals the market price." Crypto has multiple venues; there is no single universal order book.
✅ Quick checkpoint
- What is the main structural difference between a CEX and a DEX?
- Why can two exchanges show slightly different prices?
- Why is proof of reserves not the same as proof of solvency?
Frequently Asked Questions
❓ Is a crypto exchange the same as a broker?
Not necessarily. An exchange is primarily a trading venue or matching mechanism, while a broker may intermediate access, quote prices or route orders to other venues. Some firms combine multiple roles.
❓ What is an order book?
It is a list of current buy and sell orders at different prices and sizes on a venue.
❓ Are DEX trades always anonymous?
No. Public blockchains generally record transactions and wallet addresses. A wallet address is pseudonymous, not automatically private or anonymous.
📋 Summary
- Crypto exchanges can be centralised or decentralised and their risk structures differ materially.
- Execution quality depends on liquidity, depth, slippage and market impact—not just headline fees.
- Custody, solvency, smart-contract and network risks should be assessed separately from trading functionality.
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