Electronic Code of Federal Regulations (eCFR). FAR, DFARS, and all agency FAR supplements with point-in-time version history. 13 tools, 240 regression tests.
Enables interaction with the Regulations.gov API to search federal rulemaking dockets, proposed and final rules, public comments, and comment periods. Supports tracking FAR/DFARS case histories and monitoring open comment periods across federal agencies with optional API key authentication for higher rate limits.