You send: Tether (SOL)
Tether (USDT) is a stablecoin designed to track the US dollar, issued on many blockchains at once. The network matters as much as the ticker: USDT on TRC20, ERC20 or BEP20 are not interchangeable at the address level. More about Tether.
On this pair it moves over Solana — an address there 32 to 44 characters, no 0x prefix.
USDT also exists on other networks — different addresses, not interchangeable: Aptos, Arbitrum, AssetHub, Avalanche, Celo.

