Definition
A cryptocurrency exchange brings together people who want to exchange digital assets, sometimes including trades between cryptocurrency and government-issued money. It provides a trading venue rather than determining an asset’s fundamental value. Prices emerge from available quotes, orders, or liquidity pools and can differ between venues.
How It Works
A centralized exchange usually maintains customer accounts, records balances, and matches orders through its own systems. A decentralized exchange uses blockchain-based contracts to settle trades, often from a user-controlled wallet. Order-book venues match compatible buying and selling instructions; automated market makers quote swaps using liquidity pools and pricing rules.
For example, a BTC/USDT market quotes the amount of USDT needed to buy one BTC. A completed purchase increases the buyer’s BTC balance while reducing the USDT balance, after applicable fees. Trading an account balance and withdrawing an asset to an external wallet are separate actions.
Key Considerations
Trading fees, spreads, available liquidity, and withdrawal arrangements affect the actual cost and usability of a venue. Centralized custody creates reliance on the operator; decentralized trading introduces contract and transaction risks. A listing does not establish that an asset is safe, and prices or successful execution are never guaranteed.