The US has released its 2nd Open Govt. National Action, and the promotion of participatory budgeting is part of it. Here’s an excerpt of the White House blog:
"The United States will promote community-led participatory budgeting as a tool for enabling citizens to play a role in identifying, discussing, and prioritizing certain local public spending projects, and for giving citizens a voice in how taxpayer dollars are spent in their communities. This commitment will include steps by the U.S. Government to help raise awareness of the fact that participatory budgeting may be used for certain eligible Federal community development grant programs."