This API offers real-time and historical US Treasury and LIBOR-based swap and forward rates. The US Treasury rates data provides real-time treasury prices and yields for various maturities of T-Bills, T-Notes and T-bonds. Swap rates data include rate quotes and yields for OTC LIBOR-based interest rate swaps in many traded currencies as well as swaption data. You can also use API to chart US Treasury rates and swap yield curves for easy viewing and comparisons.
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So far, we don't have a record of any changes to this API