This is the weighted index for Binance's tether-margined BTC and ETH markets.
It was created to test the accuracy of the weighting and ensure the index was correct. With consideration to the history of tether's effect on Bitfinex's spot market, I had interest in the differences in Bitfinex's USD and UST pairs. Although the difference now is minor, xxx/UST pairs in the index are more accurate.
Options to configure are choosing the base currency, BTC or ETH, and the quote currency, USD or UST (USDT).