The risk-free rate for United States is typically proxied by the shortest-maturity government bond yield or the central bank's overnight policy rate. It is the baseline discount rate for all United States asset valuations.
Why FX traders watch it
All asset prices in United States are discounted against the risk-free rate. Rising risk-free rates lift the cost of capital, dampen equity valuations, and typically attract foreign capital to usd-denominated bonds.
How to interpret the data
Rising risk-free rates relative to global peers support the usd via carry and capital flow channels. Falling rates signal monetary easing expectations and are typically usd-negative.