如何在 Uniswap 上兌換代幣？ （初學者指南）

Connecting Your Wallet

1. Open the Uniswap interface at app.uniswap.org in a supported browser like Chrome or Brave. 2. Click the “Connect Wallet” button located in the top right corner of the page. 3. Select your preferred wallet—MetaMask, Coinbase Wallet, Trust Wallet, or others—and follow the prompts to authorize connection. 4. Ensure your wallet is set to the correct network—Ethereum Mainnet for ETH-based swaps or Polygon, Arbitrum, or Base for their respective ecosystems. 5. Confirm the connection request in your wallet extension or mobile app before proceeding.

Selecting Tokens and Amounts

1. On the swap interface, locate the input field labeled “From” and click the token symbol or “Select a token” to open the token list. 2. Search for or scroll to find the token you wish to swap from—ETH, USDC, DAI, or any ERC-20 or compatible asset. 3. Enter the amount you want to exchange in the “From” field; the interface will instantly calculate the estimated output. 4. Click the “To” field and choose the destination token—this may include stablecoins, governance tokens, or newly deployed assets verified on Uniswap. 5. The interface displays the current price impact, slippage tolerance, and pool liquidity depth beneath the input fields—these metrics affect execution certainty and rate accuracy.

Adjusting Swap Settings

1. Click the gear icon in the top right of the swap panel to access advanced parameters. 2. Set slippage tolerance manually—default is 0.5%, but volatile tokens may require 1–5% to avoid transaction failure. 3. Toggle “Expert Mode” only if you understand implications—this disables safety warnings and allows custom contract interactions. 4. Enable “Limit Order” or “Multi-Hop” routing depending on whether you seek guaranteed pricing or optimized path efficiency across multiple pools. 5. Review the “Price Impact” indicator—if it exceeds 3%, consider splitting the trade or selecting an alternative pair with deeper liquidity.

Confirming and Executing the Transaction

1. After entering amounts and verifying settings, click “Swap” to initiate the preview screen. 2. The preview shows exact output, estimated gas fee in ETH or native chain token, and deadline (default 20 minutes). 3. Approve the token contract first if swapping a non-native asset—this is a one-time permission per token per wallet. 4. Once approved, click “Confirm Swap” and sign the transaction in your wallet interface. 5. Wait for blockchain confirmation—Ethereum mainnet typically requires 1–3 blocks (~15–45 seconds); Layer 2 networks confirm faster, often under 5 seconds.

常見故障排除

1. “Insufficient Liquidity” appears when the selected pair has no active pool or extremely low reserves—switch to a more established token pair or check if the token is whitelisted on Uniswap v3. 2. “Transaction Reverted” may stem from outdated allowances, expired deadlines, or incorrect slippage—reconnect wallet, refresh page, and re-approve if needed. 3. Pending transactions often result from low gas fees—use the “Edit” option next to gas settings to increase priority fee or switch to EIP-1559 mode. 4. Token not showing in search? Verify its contract address is correctly added to your wallet and that it complies with ERC-20 or equivalent standards. 5. Unexpected output amount? Cross-check the displayed price impact and compare against real-time oracle feeds or DEX aggregators like 1inch or Matcha.

常見問題解答

Q: Do I need ETH to swap tokens on Ethereum-based Uniswap? A: Yes—ETH is required to pay gas fees even when swapping non-ETH tokens. Without ETH balance, transactions will fail regardless of token holdings.

Q: Can I swap tokens across different blockchains using Uniswap? A: No—Uniswap operates per-chain. You must use the version deployed on the target network (eg, Uniswap on Arbitrum for Arbitrum tokens) and bridge assets separately if moving between chains.

Q: Why does my wallet ask for two separate approvals? A: First approval grants Uniswap's router contract permission to spend your input token. Second approval executes the actual swap—this separation prevents unauthorized transfers.

Q: Is it safe to approve unlimited token allowances? A: No—unlimited allowances pose security risks if the router contract is compromised. Use “Set Limit” or revoke unused approvals via Etherscan or Revoke.cash.