What is a DEX (decentralised exchange) in crypto?

If you’ve ever bought or sold crypto on a traditional platform, you’ve likely interacted with a centralised exchange (CEX), such as BTC Markets. CEXs are exchanges run by a centralised organisation that

• matches buyers and sellers,
• handles transactions, and
• offers customer support.

But what if there were no centralised entity running the exchange? That’s where DEXs, or decentralised exchanges, come in. So, how do they work, and what should users understand before getting started?

How does a DEX work?

A DEX lets you trade crypto directly with others on a peer-to-peer basis, wallet to wallet, without handing over control of your digital assets. Instead of relying on a central authority, DEXs use smart contracts and blockchain networks to automate trades. For those who value privacy, transparency, and full ownership of their crypto, DEXs offer a powerful alternative.

Instead of using a traditional order book controlled by a company, most DEXs use smart contracts - self-executing code on the blockchain - to match and process trades between users.

Because trades happen directly between digital wallets through peer-to-peer protocols, you retain full control of your crypto throughout.

Many DEXs use a model called Automated Market Making (AMM). In this system, trades happen against a liquidity pool - a collection of tokens locked in a smart contract rather than between two individual traders. Think of it like a shared pot of tokens that anyone can contribute to or swap from. The price adjusts automatically based on supply and demand in the pool.

Because all transactions are recorded on a public blockchain, the process is transparent and cannot be changed. That also means users need to take extra care, as there's typically no customer service if something goes wrong.

What can you trade through a DEX?

You’ll find a broad mix of assets available on DEXs - from well-known cryptocurrencies like Ethereum and Solana, to stablecoins such as USDT and USDC. Many also support tokens from DeFi projects and even wrapped versions of assets like Bitcoin (WBTC), allowing for cross-chain functionality and trading.

DEXs usually focus on assets built on the same blockchain. For example, Solana-based DEXs support many of the meme coins from pump.fun a no-code platform for launching meme coins that released over 5m meme coins in their first year. Cross-chain trading options are emerging but often require additional tools or bridges.

DEXs often have tokens with lower liquidity and the more obscure names and may feature lesser-known, higher-risk tokens,

Advantages of using a decentralised exchange

There are several reasons why crypto users might prefer a DEX over a traditional, centrally-controlled platform.

• Digital asset control: You retain full ownership of your private keys and funds, without needing to trust a third party.
• No account sign-ups: Most DEXs don’t require personal information, enabling fast and anonymous access.
• Global accessibility: Anyone with a crypto wallet and internet connection can use a DEX, regardless of location.
• On-chain transparency: All transactions are publicly recorded on the blockchain and can be verified by anyone.
• Early token access: DEXs often list new or emerging tokens not yet available on centralised platforms.

Potential risks of using a DEX

While DEXs offer more freedom, they also come with additional risks that are not beginner-friendly:

• Smart contract bugs can pose risks. Flaws in the smart contract code that drives the DEX might be exploited, leading to you experiencing a financial loss.
• Low liquidity can make it harder to complete large trades at consistent prices. For example, selling a lesser-known token in high volumes may result in a lower average price.
• Without centralised oversight, scam tokens can slip through. You are responsible for verifying the token details are correct.
• There is no support desk. If you make a mistake, there’s usually no way to recover your funds. The community may offer you help, but use caution, as you may be sharing sensitive information with strangers.

These issues highlight the importance of fully understanding how to use wallets and verify token details before trading on a DEX.

Are there fees with decentralised exchanges?

Yes, DEXs involve a few different types of costs:

• Network fees (gas fees): These are paid to the blockchain to process your transactions. These can vary according to the congestion levels of the underlying blockchain.
• Trading fees: A small fee is often taken from each trade and shared with those who provide the liquidity, called liquidity providers.
• Slippage: This is when the price you expect changes by the time your trade is completed - this is especially common during low liquidity or periods of high volatility.

Fees vary depending on the blockchain used. For instance, Ethereum gas fees can be higher than those on Solana or Base.

Trade crypto with BTC Markets

If you're exploring cryptocurrency, some users prefer decentralised exchanges for the control they offer, though they come with trade-offs. BTC Markets offers a secure and regulated platform that’s designed with Australian users in mind.

You can explore and trade a wide range of cryptocurrencies with confidence, backed by strong local support and reliable infrastructure. Whether you're just starting or already familiar with crypto, BTC Markets provides an accessible and trusted experience.

Start your crypto journey securely with BTC Markets

Conclusion

A decentralised exchange (DEX) enables peer-to-peer trading of crypto assets using smart contracts and blockchain networks. It offers greater privacy, transparency, and user control, but also comes with risks that users need to manage. Whether you prefer a DEX or a centralised platform, understanding how each works can help you navigate the crypto space with more confidence.