The U.S. Treasury Department's Office of Financial Research publishes a "Short-term Funding Monitor" that provides data that may address your needs. For example, you can find a data on Treasury constant maturity rates (3-month rates shown here)
as well as the mean interest rate chargecharged on repurchase agreements in different markets. Also, when looking at this data, recall that a reverse repo is just a repo viewed from the perspective of the other party.