Sorry I am a designer with a little glimpse of web development. Is this what you are looking for?
https://shapeshift.io/rate/usdt_btc Browsing this page will show you Shapeshift's current rate for USDT / BTC
On
https://info.shapeshift.io/api I can see all methods we can use to work with their api.
Btw, I don't know what is the usd value they use for their market. The values displayed just under the form to make an exchange:
https://shapeshift.io/#/coinsAny details about this ? I don't want to use other providers like poloniex or btc-e because their values are not the same than shapeshift.
Thanks.