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You can try out swapping with this $TEST<>USDC trading pair on Base Sepolia. First, you’ll need to acquire some of the mock USDC token.

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Via Cast Command

This cast command will mint 1000 USDC to a recipient of your choosing. All you need to pay is the tiny gas fee:
cast send 0xfAAB528466868AAD7A5732F113De93f5133EF2ea "mint(address,amount)" <YOUR_WALLET_ADDRESS> 1000000000 --rpc-url https://sepolia.base.org --private-key <YOUR_PRIVATE_KEY>

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Mint on the Base Scan Explorer Page

1

Navigate to the token page

Follow this link: mock USDC token page
2

Connect your wallet

Click the “Connect to Web3” button to open your browser wallet. Follow steps from there.
Connect wallet screenshot
3

Fill in the `mint` function values and click the `Write` button

mint function screenshot
With enough mock USDC to test some transactions you’re ready to navigate to the $TEST<>USDC page and try out swapping.
swap ui screenshot
Click the “Swap pair” button to open the details modal. From there enter some of the mock USDC you minted to swap for some $TEST token!
swap ui modal screenshot
Click the Review button and confirm in the next dialog that pops up.
swap ui modal details screenshot
Sign the transaction in your wallet and the swap will execute. That’s all there is to it!