Introduction
When you swap crypto, two worlds coexist: centralized exchanges (CEX) and decentralized exchanges (DEX). The difference isn't technical trivia — it changes who holds your funds, who can freeze them, and how much complexity you have to handle. This module clarifies both models, their main players, and above all where Deblock fits: a hybrid that gives you the self-custody of a DEX without the technical complexity.
The CEX: the centralized platform
A CEX (Centralized Exchange) is a platform that acts as the middleman between you and the market. You deposit your money, the company holds your crypto on its own servers, and it executes your orders. Binance, Coinbase and Kraken are CEXs. It's simple, fast, with customer support — but you don't hold your keys.
The famous crypto saying goes: "not your keys, not your coins". On a classic CEX, the platform holds the keys. If it goes bankrupt (FTX in 2022), if it freezes withdrawals, or if it gets hacked, your funds are exposed.
- You deposit, the platform holds your crypto (custodial).
- Simple, fast, customer support, easy euro conversion.
- Risk: bankruptcy, freezes, platform hacks.
- Examples: Binance, Coinbase, Kraken.
The DEX: the decentralized exchange
A DEX (Decentralized Exchange) is a program (smart contract) running directly on the blockchain. There's no company holding your funds: you connect your own wallet, and the swap happens peer-to-peer through code. Uniswap (on Ethereum) and Jupiter (on Solana) are the most used DEXs.
The upside: you keep full control of your keys at all times, no one can freeze your funds, and you access thousands of tokens plus DeFi. The downside: you must manage your own wallet, understand network fees (gas), sign every transaction, and an address mistake is irreversible.
- No intermediary: a smart contract on the blockchain.
- You keep your keys at all times (non-custodial).
- Access to thousands of tokens, NFTs and DeFi.
- Examples: Uniswap (Ethereum), Jupiter (Solana).
The currency desk vs the self-service machine
A CEX is a currency exchange desk with a clerk who handles your transaction and holds your money during the operation. A DEX is a self-service machine: no one touches your money, but you must do everything correctly yourself — and there's no one at the counter if you make a mistake.
CEX vs DEX: the comparison
Neither model is "better" in absolute terms — they serve different needs. The CEX favors simplicity at the cost of trusting a third party. The DEX favors control at the cost of technical complexity.
- Key custody: CEX = the platform · DEX = you.
- Simplicity: CEX = very simple · DEX = technical.
- Customer support: CEX = yes · DEX = none (code only).
- Freeze/bankruptcy risk: CEX = yes · DEX = no.
- DeFi / NFT / rare token access: CEX = limited · DEX = full.
- Euro conversion: CEX = easy · DEX = indirect.
A DEX is always safer than a CEX since I keep my keys.
Actually : More sovereign, yes. Safer, that depends on you: on a DEX, an address mistake, a fake smart contract or a phishing attack can wipe you out, with no recourse. For a beginner, the full autonomy of a DEX can be riskier than a regulated platform. Safety depends on your level, not just the model.
Where Deblock fits: the best of both worlds
Deblock doesn't force you to choose. On the custody side, you have your own private key for your Deblock wallet: that's self-custody, like a DEX. If Deblock disappeared, you'd keep access to your crypto through your key — unlike a classic CEX where everything depends on the platform.
On the swap side, when you buy or convert a crypto inside Deblock, the app automatically routes your order through DEXs like Uniswap and Jupiter to find you the best price. In other words: you're already using a DEX without handling its technical complexity. No external wallet to connect, no gas to calculate manually, no transaction to sign line by line.
The result: you access DeFi and a wide universe of tokens with the simplicity of an app, while keeping control of your key. That's exactly the bridge between the two worlds most beginners are looking for without realizing it.
The Deblock hybrid in one sentence
Self-custody of a DEX (you hold your key) + simplicity of a CEX (the app handles the complexity) + automatic routing through Uniswap and Jupiter for the best price.
Swap through DEXs, without the complexity
With Deblock, you benefit from routing through Uniswap and Jupiter while keeping your private key. Open your account and try a first swap in minutes.
Open my Deblock accountWhat you should remember
- 01CEX = centralized platform that holds your crypto (Binance, Coinbase).
- 02DEX = decentralized exchange where you keep your keys (Uniswap, Jupiter).
- 03"Not your keys, not your coins": on a CEX, you trust the platform.
- 04Deblock = hybrid: your private key + automatic routing through DEXs.
Ready to practice?
Open your Deblock account in minutes and apply what you have just learned.