Two ways to buy a coin, and what separates them
A centralised exchange (CEX) is a company. You open an account, verify, put money into the company account and trade inside its database. No blockchain is involved in the trade — which is why it is instant and nearly free.
A decentralised exchange (DEX) is a smart contract. No company and no registration: you connect a wallet and swap coins straight out of it. Your keys, your coins, your responsibility.
The core difference: who holds your money
Everything else follows from this.
On a CEX the exchange holds the coins. So it can freeze them, ask for documents and restrict withdrawals — and equally it can help when you make a mistake: there is support, there is a dispute, there is a human on the other side.
On a DEX you hold them. Nobody will freeze anything or ask for a passport — and nobody will help either. Send to the wrong address, lose your recovery phrase, buy a trap token, and there is no one to appeal to.
The comparison that matters
- Speed. CEX is instant. DEX waits for block confirmation: seconds on Solana, minutes on Ethereum.
- Cost. CEX charges a percentage, usually 0.1%. DEX charges a pool fee (0.05–1%) plus gas, which does not scale with trade size and makes small swaps pointless.
- Range. On a DEX a coin appears on launch day. On a CEX it appears after a listing that may never happen.
- Price formation. A CEX uses an order book. A DEX uses a formula: two coins sit in a pool and the rate depends on their ratio, which your trade changes.
- Entry. A CEX needs verification. A DEX needs only a wallet.
Why the price gap between them lasts longer
Between two centralised exchanges a gap closes in seconds: bots hold money on both and close it instantly.
Between a pool and an exchange that is impossible. Closing the gap means physically moving the coin through the blockchain, paying gas and waiting for confirmations. That barrier holds the divergence open — on fresh tokens for hours.
The general rule across this whole market: a spread lives where it is hard to close.
What to choose for the job
Starting from zero — CEX only. Lower cost of error and someone to ask.
Bringing in ordinary money — CEX only: fiat does not exist on a DEX.
Need a coin on launch day — DEX, because no exchange has it yet.
Working with small amounts — CEX: gas will eat everything.
Want to hold coins yourself — a wallet and a DEX, with the recovery phrase on paper.
What our service covers
We collect both: centralised prices in cross-exchange arbitrage and pool prices in the DEX scanner, which compares them across eight networks.
The step-by-step route between them is in the DEX to CEX guide.
Frequently asked
Which is safer? Different risks, not different levels. On a CEX you trust a company; on a DEX you answer for everything and mistakes are irreversible.
Is verification needed on a DEX? No, and neither is there any protection: refunds are technically impossible.
Why does a DEX price differ from the exchange? Because it is derived from the ratio of coins in a pool, and pools are filled by participants. The smaller the pool, the larger the divergence.
Can I fund a DEX from a card? Not directly. The usual path is buying on a CEX and withdrawing to your own wallet.
What is gas? The network fee for processing a transaction, paid in the native coin: ETH, BNB, SOL. It does not depend on the amount, which is why small trades on expensive networks do not pay.