Avalanche
Avalanche is three chains wearing one name. Only one of them is the one you want. The C-Chain is the EVM chain with 0x addresses, and it is where USDT, USDC and AVAX live. The X-Chain and P-Chain use a different address format entirely and are not destinations in this wallet.
C-Chain, not X-Chain
Avalanche addresses beginning with X- or P- belong to the other two chains and will not receive an EVM transfer. Everything this wallet sends to Avalanche goes to the C-Chain, whose addresses look like any other EVM address.
The AVAX you do not need
C-Chain fees are paid in AVAX. As everywhere else here, that cost is inside the operation and quoted in the token you are sending, so a wallet holding only USDC can still move it.
Bridged dollars
Avalanche carries bridged versions of both stablecoins, and older wallets sometimes label them with a .e suffix. The wallet folds those into the plain name so one asset does not appear twice under two spellings.
Related
Questions
Which Avalanche chain does this use?
The C-Chain, the EVM one with 0x addresses. X-Chain and P-Chain addresses are not valid destinations.
Do I need AVAX to send?
No. The AVAX fee is charged inside the operation.
What is USDC.e?
The bridged spelling of the same dollar. The wallet shows it as USDC so it does not appear as two separate assets.