To buy TerraUSD (UST), you need to have Bitcoin or Ether to swap for UST on the exchanges where the token is listed. These exchanges include KuCoin, Uniswap (V2), Bittrex, Bitfinex, Gate.io, PancakeSwap (V2), Sushiswap, Terraswap, 1inch Exchange, MEXC, OpenOcean, DODO BSC .