You send: USD Coin (SOL)
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 Solana — an address there 32 to 44 characters, no 0x prefix.
USDC also exists on other networks — different addresses, not interchangeable: Algorand, Aptos, Arbitrum, Avalanche, BEP20, Base.

