The answer
Solana transaction fees are paid in SOL, even when the asset transferred is USDC. A receiver may also need a token account, which can require a refundable rent-exempt balance.
What to do next
Check whether the sender has enough SOL for the fee and whether a recipient token account already exists. Use your wallet’s transaction preview for the actual cost.
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Ledger hardware wallet
A hardware signing device to compare for supported Solana assets; it does not fix Solana network, token or smart-contract faults.
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Frequently asked questions
Can I send Solana USDC using only the USDC balance?
Usually not with a standard self-funded transaction; SOL normally pays the fee.