The Golden Dome missile shield has received $3.2 billion in funding for space-based interceptors, with 12 companies selected to develop the technology. The overall cost of the Golden Dome initiative is uncertain, with estimates ranging widely, and some reports suggest it could be as high as $1.2 trillion. The project's development and costs are being closely watched, with multiple companies, including SpaceX and Lockheed Martin, involved in the effort.