This Planet Money episode investigates the opaque nature of federal spending by focusing on the "secure payment system," a crucial money pipe through which most federal payments flow. The podcast highlights the Daily Treasury Statement (DTS), a publicly available but often overlooked document that details daily federal inflows and outflows, using it to track the impact of a recent spending freeze. The episode features interviews with researchers who created a tool visualizing DTS data, showcasing its use in monitoring various programs, from SNAP benefits to NSF grants, and even the reliability of Treasury interest payments. Listeners learn about the DTS and its potential uses for tracking government spending and gain insight into the transparency (and occasional opacity) of the US federal budget. The podcast concludes by emphasizing the importance of this readily available data source for informed public discourse and policy analysis.