[1] 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.

Finalists were to be chosen after a five-round competition voted on by fans, public radio professionals and celebrity judges.

On August 11, PRX was included in CPB's agreement with SoundExchange through 2015 as a covered public radio entity for music webcasting royalties.

[3] PRX was also announced as a winner of the 2010 Knight News Challenge for Story Exchange, a crowdfunding journalism project, on June 16.

On December 8, 2011, PRX announced $2.5M in funding from Knight Foundation to create the Public Media Accelerator.

[4] On August 15, 2018, PRX and Public Radio International announced they would merge, though both networks would maintain separate identities and programming.