QuoteMedia currently does not currently have coverage for Treasury Bonds data.  There is access to some Constant Maturity Treasury Yields which are updated at end of day or a handful of Treasury Bond Index data symbols that are updated intraday.  


^IRX = 13 Week Treasury Bond Index

^FVX = 5 Yr Treasury Bond Index
^TNX = 10 Yr Treasury Bond Index
^TYX = 30 Yr Treasury Bond Index