A USDC-only Monad deposit still needs MON
If you hold no MON and plan to bridge only USDC, choose a route that adds destination MON; if it does not offer that, arrange a MON withdrawal to your Monad wallet before trying to transact. USDC can arrive in the wallet, but it cannot pay Monad transaction fees. A Monad bridge moves assets between networks; it does not make the USDC it delivers usable as gas. Why can’t USDC pay the fee? Monad uses MON as its native gas token, so your wallet needs MON to pay for transactions. Gas is the network resource a transaction consumes, and the fee is paid in the chain’s gas token. This is the same basic distinction you may know from other EVM chains: holding a token that can be swapped does not mean you can use it to pay the transaction fee. That creates a practical deadlock for a new wallet with zero MON. It can receive bridged USDC, but it cannot send that USDC, approve a token allowance, or swap some of the balance for MON. Each of those actions is itself a transaction and needs gas. The U...