Definition
DEX (Decentralized Exchange) — a decentralized exchange running on smart contracts. Allows direct cryptocurrency swaps without registration or KYC.
DEX vs CEX
| Criteria | DEX | CEX (Binance, Coinbase) |
|---|---|---|
| Fund custody | Your wallet | Exchange wallet |
| Registration | Not needed | Required |
| KYC | No | Yes |
| Security | You control | Exchange hack risk |
| Liquidity | Lower | Higher |
| Fees | 0.3% + gas | 0.1% |
How DEX Works
AMM (Automated Market Maker)
Instead of orderbook, DEX uses liquidity pools:
ETH/USDC Pool:
├── 100 ETH
└── 200,000 USDC
Formula: x × y = k (constant)
You give 1 ETH → receive ~1,980 USDC
(accounting for slippage and fee)
Liquidity Providers
People deposit token pairs into pools and receive:
- Trading fees (0.3% of volume)
- Sometimes farming tokens
- Impermanent loss risk
Popular DEXs
| DEX | Network | TVL | Features |
|---|---|---|---|
| Uniswap | Ethereum, L2 | $5B+ | Largest DEX |
| Curve | Multi-chain | $2B+ | Stablecoins |
| PancakeSwap | BNB Chain | $2B+ | Low fees |
| GMX | Arbitrum | $500M+ | Derivatives |
How to Use DEX
Steps
- Install wallet (MetaMask)
- Add ETH for gas
- Connect wallet to DEX
- Select token pair
- Enter amount and confirm
Tips
- Verify token contract address
- Watch slippage settings
- Use aggregators (1inch, Paraswap)
- Check gas before transaction
DEX Risks
- Scam tokens — anyone can create a token
- High gas — expensive L1 transactions
- Slippage — with low liquidity
- Smart contract risks — bugs, exploits
DEX and DCA
Using DEX for DCA:
Pros
- No KYC — privacy
- Fund control
- Access to new tokens
Cons
- Gas fees
- Harder for beginners
- No automation
Recommendation
For DCA into Bitcoin and Ethereum, better to use:
- CEX with auto-buy (Binance, Kraken)
- Specialized services (Swan Bitcoin)
DEX — for swapping already purchased assets or DeFi activities.
