USTC (TerraClassicUSD) is a stablecoin that is part of the Terra Classic ecosystem. It was designed to maintain a parity with the US dollar (1 USTC = 1 USD).
USTC is an earlier version of the stablecoin UST (TerraUSD), which was part of the Terra ecosystem before the project's collapse in May 2022. After the collapse, the Terra network was forked into Terra Classic (LUNC) and Terra 2.0 (LUNA).
USTC is still traded on some exchanges and can be used for transactions and investments within the Terra Classic ecosystem. However, it is important to note that USTC is no longer maintained by the original Terra team and its value can be volatile.