What Is a DEX (Decentralized Exchange)?
How a DEX works
On a traditional exchange, a company holds your money and matches buyers with sellers. On a DEX, code on the blockchain does the matching. You connect a wallet, pick two tokens, approve the trade and the swap settles on-chain. Many DEXes use liquidity pools so there is always something to trade against.
DEX vs centralized exchange
| DEX | Centralized exchange | |
|---|---|---|
| Who holds your funds | You, in your wallet | The company |
| Sign-up | Usually none, just a wallet | Account and often identity checks |
| Token choice | Anyone can create a market | Tokens are chosen by the exchange |
| Support if you make a mistake | Usually none | Sometimes available |
DEXes on Solana
Solana has several DEXes and aggregators. QNT trades in a pool on PumpSwap, created 2026-06-04. Aggregators such as Jupiter compare routes across venues, which you can learn about in how to swap on Jupiter.
Risks to understand
- Anyone can list any token, including fakes and scams. Always check the contract address.
- Transactions are final. A wrong address or a bad approval usually cannot be undone.
- Thin liquidity can mean large price swings and poor fills.
- Fake websites imitate real DEXes to steal wallet access.
Read memecoin scams and how to avoid them before you trade. Memecoins are highly speculative and you can lose everything you put in.
A good habit is to treat every DEX trade as a small experiment. Use an amount you could lose without harm, confirm the token address, and review the quote before you sign. The freedom of trading without permission is real, but so is the lack of a safety net. Nobody can cancel a trade for you afterward, and nobody will step in if you buy the wrong token by mistake.
A trade, step by step
These numbers are made up to show the mechanics. A pool holds 100 SOL and 10,000,000 tokens, so the two reserves multiply to 1,000,000,000 (the constant product rule described in Uniswap's documentation). You swap 10 SOL in. The pool now holds 110 SOL, so to keep the product fixed it must hold 1,000,000,000 / 110 = about 9,090,909 tokens, and it pays out about 909,091 tokens. You paid an average of about 0.0000110 SOL per token, against a starting price of 0.0000100 SOL, so about 10 percent worse. The price after your trade is 110 / 9,090,909, about 0.0000121 SOL, which is 21 percent above where it started. That gap is price impact, and it is why pool size matters. Try your own numbers in the price impact calculator.
Order book versus pool
| Order book exchange | Pool-based DEX | |
|---|---|---|
| Price set by | Matching buyers and sellers | A formula on the pool's reserves |
| Liquidity from | Market makers and traders | Anyone who deposits both tokens |
| Typical weakness | Needs active market makers | Price impact on large orders |
Common mistakes
- Searching by token name and buying the first result. Copies exist. Paste the verified address. See How to Verify a Solana Token Contract Before You Buy.
- Assuming "decentralized" means "safe". Nobody checks the token for you.
- Approving more than needed. Review and revoke old permissions with A Revoke and Review Routine for Solana Token Delegations and Connected Apps.
- Using a main wallet for experiments. See Solana Wallet Safety.
How to check a DEX trade yourself
- Confirm the pool and token address on DexScreener.
- Look at the pool's liquidity compared with your order size.
- After trading, paste the signature into Solscan and see what actually moved. Our walkthrough is How to Read a Solana Transaction on an Explorer.
Education only, not financial advice. The QNT memecoin is independent of Quantinuum Ltd.
Sources and further reading
Facts checked 2026-10-09 against the linked pages. Education only, not financial advice. Nothing here predicts the price of any asset, and the QNT memecoin is an independent community token with no link to Quantinuum Ltd or any lab, chain or exchange named on this page.
Frequently asked questions
Do I need an account to use a DEX?
Usually no. You connect a crypto wallet instead of signing up, and the DEX never takes custody of your funds.
Is a DEX safer than a normal exchange?
Not automatically. You avoid exchange custody risk, but you take on scam tokens, fake sites and irreversible mistakes.
What DEX does QNT trade on?
QNT trades in a PumpSwap pool on Solana, created 2026-06-04. Verify the contract address DeqsPTYwvsNjkf5G8zDxziUnFPp55nQZA4vrNM2apump before any trade.
Why do I pay fees on a DEX?
You pay a small network fee to the blockchain, and often a trading fee that goes to the pool or the venue.
Is a DEX anonymous?
Not really. Wallet addresses are public and every transaction can be traced on-chain, although the address does not name you.
What is an aggregator?
A tool such as Jupiter that compares routes across many pools and can split an order to get a better overall price. See How to Swap Tokens on Jupiter (Solana DEX Aggregator).
Can a DEX trade fail?
Yes. It can fail from tight slippage, congestion or an expired quote, and a failed transaction can still cost a small fee.
Do I pay the DEX to use it?
You pay a network fee and usually a small trading fee that goes to liquidity providers or the protocol.
Keep reading
- What Is a Liquidity Pool in Crypto?
A liquidity pool is a shared pot of two tokens that lets people swap on a DEX without an order book. Learn how pools set prices and why they matter for safety. - How to Swap Tokens on Jupiter (Solana DEX Aggregator)
Jupiter finds the best route to swap Solana tokens. Learn how to swap SOL for a token like QNT safely, with slippage explained. - What Is a Crypto Wallet? Hot Wallets, Cold Wallets and Recovery Phrases
A crypto wallet holds your keys, not your coins. Learn the difference between hot and cold wallets and how to keep yours safe. - Memecoin Scams and How to Avoid Them
The most common memecoin scams, from fake contract addresses to wallet drainers and rug pulls, and a simple checklist to stay safe.
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