sentences:  PRX provides stations and producers with tools to manage and monitor transactions, rights, usage statistics and payments within their individual and group accounts.The PRX site and services launched in September 2003 after a two-year planning, research, and development phase supported by the Corporation for Public Broadcasting, the National Endowment for the Arts, and the Ford Foundation.Since then PRX has received additional support from the NTIA Technology Opportunities Program, the MacArthur Foundation, the Open Society Institute, the Surdna Foundation, and Google Grants.