The answer
The address may be identical, but Base and Ethereum are separate networks. Sending directly on Base does not move the balance to Ethereum mainnet.
What to do next
If the recipient controls that address on Base, the asset may be available there. If mainnet funds are required, use a supported bridge or exchange transfer route.
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Frequently asked questions
Does a matching wallet address guarantee the exchange credits USDC?
No. The receiving platform must support the particular asset and network.