You send: USD Coin (Aptos)
USD Coin (USDC) is a dollar-pegged stablecoin issued by Circle and backed by cash and short-term US Treasuries. Like USDT it exists on several networks, each with its own address format and fees. More about USD Coin.
On this pair it moves over Aptos — an address there starts with 0x — 66 characters.
USDC also exists on other networks — different addresses, not interchangeable: Algorand, Avalanche, BEP20, Base, Celo.

