To withdraw USDC to an external wallet, tap the three dots next to your Cash balance, select Withdraw, then choose Crypto wallet. Enter the amount and tap Continue.
Select the network the receiving wallet supports from the dropdown at the top. fomo supports withdrawals on Solana, Base, BNB Chain, Monad, and Ethereum. Paste the USDC deposit address from your receiving wallet for that same network, then tap Review and confirm.
Make sure the network you select in fomo matches the network the receiving wallet expects. Sending to the wrong network or to an address you do not control can result in permanent loss of funds.