How to Trade on a DEX: A Beginner's Walkthrough (Uniswap, etc.)

What Is a DEX ?

A decentralized exchange(DEX) lets you swap one token for another directly from your wallet.No account signup, no KYC, no middleman holding your funds.

The biggest ones: Uniswap , SushiSwap , PancakeSwap .They all work similarly.

Step - by - Step: Your First Swap

Let's walk through swapping $100 of ETH for USDC on Uniswap.

1. Go to app.uniswap.org (bookmark it, never Google it)
2. Connect your wallet
3. Select ETH as the "sell" token, USDC as the "buy" token
4. Enter the amount
5. Review the quote(check the exchange rate and fees)
6. Click "Swap" and confirm in your wallet

On Arbitrum or Base, this costs about $0.02 - 0.10 in fees.On Ethereum mainnet, expect $0.50 - 2.00 depending on network activity.

The 3 Biggest Mistakes Beginners Make

1. Buying Fake Tokens

Scammers create tokens with identical names and logos to real projects.The only thing they cannot clone is the contract address .

How to stay safe:

• Always verify the contract address on CoinGecko or CoinMarketCap before swapping
• If a token just appeared and has no history, it is probably a scam
• If you search for it and it does not show up on major aggregators, skip it

2. Ignoring Slippage

Slippage is the difference between the quoted price and the actual execution price.For large swaps on low - liquidity tokens, you might get significantly less than expected.

Rule of thumb: Keep slippage under 1 % for major tokens.If a token requires 10 % + slippage to swap, that is a red flag.

3. Getting Sandwiched by MEV Bots

MEV bots watch the public transaction pool.When they see your swap, they can front - run it(buy before you, sell after you) and extract value from your trade.

How to reduce this:

• Use private RPCs(like Flashbots Protect) that hide your transactions
• Set tight slippage tolerance
• For small trades, the impact is usually negligible

Which Network to Use

For trades under $5,000, Layer 2 networks are the obvious choice.The same tokens are available, the same DEXs operate there, and fees are a fraction of mainnet.

A Simple Checklist Before Every Swap

• [] Am I on the real website ? (check URL carefully)

-[] Is this token verified on CoinGecko / CMC ?

-[] Is the slippage reasonable(under 1 %) ?

-[] Am I using the cheapest network for this trade ?

-[] Have I done a small test transaction first ?

Following this checklist will prevent the vast majority of costly mistakes.

Keep Reading

• How to Use Uniswap: Complete Guide — step - by - step Uniswap tutorial
• MEV Extraction: Complete Breakdown — how bots extract value from your trades
• CEX vs DEX: Which is Better ? — centralized or decentralized exchanges ?