You can move assets from the Solana blockchain to Base by transferring funds to your Coinbase account and then back to your wallet.
Transfer USDC to your Coinbase account:
Sign in to the Coinbase mobile app and select Transfer, then Receive crypto.
Select USDC.
Under Select network, select Solana.
Under Your address, select the Copy icon.
Open the Coinbase Wallet app, select your Solana USDC and initiate a send.
Select the Choose recipient field and paste the address.
Make sure the address is correct and select Confirm.
Transfer USDC on Base back to your wallet:
Open the Coinbase Wallet app and select Payments.
Select Receive.
Copy your Coinbase Wallet Ethereum address.
Go to the Coinbase mobile app and select Transfer, then Send crypto.
Select the Send crypto to field and paste the address.
Select USDC as your asset.
Under Select network, select Base as the network.
Enter an amount to send and select Preview.
Verify the transaction details and select Send Now.
Note: You will not be charged a fee or need to pay any gas for this transfer.