đ„Quick goal: Swap 0.1 ETH â USDC using MetaMask + Uniswap.
đ„Why this is handy: Instant, permissionless trades without creating an exchange account.
What You Need:
- A browser wallet (MetaMask) installed and funded with ETH.
- Small amount of ETH for the swap + gas (network fee).
- Basic comfort approving transactions.
- (Optional) Familiarity with networks â use Ethereum mainnet for this example.
A Step-by-step Tutorial
đ„Open your wallet
Open the MetaMask extension and make sure itâs on the Ethereum Mainnet and unlocked. Check you have the ETH amount plus a bit extra for gas. MetaMask+1
đ„Go to Uniswap (or chosen DEX)
In your browser, open the official Uniswap web app. Bookmark it first to avoid phishing. Official front-end docs explain the swap UI.support.uniswap.org
đ„Connect your wallet
Click Connect Wallet on Uniswap and choose MetaMask. MetaMask will show a popup â select the account to connect and confirm. Dapps can view balances but cannot move funds without signatures. MetaMask Help Center+1
đ„Select tokens and amount
In the âFromâ field choose ETH and ente0.1. In the âToâ field select USDC (make sure itâs the correct contract/token). The interface will show an estimated received amount and a price impact. support.uniswap.org
đ„Adjust slippage / settings (if needed)
Click the settings gear to set slippage tolerance (e.g., 0.5% for liquid pairs). Higher slippage tolerances increase the chance of a successful trade but also risk worse price execution. QuickNode
đ„Review gas fees & confirm
The DEX will show a transaction estimate. In MetaMask youâll see the gas fee estimate â choose âSlow / Average / Fastâ depending on urgency. Confirm the swap in MetaMask.
đ„Wait for confirmation
After signing, wait for the transaction to be mined. Youâll see the transaction hash and can view it on Etherscan if desired. The swapped tokens will appear in your wallet (add token contract if hidden). support.uniswap.org
Simple numeric example
- Swap 0.1 ETH at price 1 ETH = $2,000 â expected USDC â $200 (minus 0.3% fee + slippage + gas).
- Gas (example) might be ~$5â$20 depending on congestion â always check before confirming.
Risks & tips
- Phishing sites: only use official dapp URLs.
- Wrong token: verify token contract address. Fake tokens exist.
- High slippage / front-running: keep slippage reasonable and avoid tiny liquidity pairs.
- Small test swap: try a tiny amount first to confirm everything works.
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