Where the federal clause matrix actually lives

Why the matrix is not in the Code of Federal Regulations, what eCFR does and does not contain, and why that matters when you build a reference.

Ask an experienced contracting professional where the FAR 52.301 matrix is and the answer may well be "in the CFR." It used to be. It is not any more. Open 48 CFR 52.301 on eCFR today and you find a one-line note: the FAR matrix is not carried in the CFR and is available on the internet at the acquisition.gov Smart Matrix. The clause text and the prescriptions are in the CFR; the applicability grid is not.

The split matters for anyone building or buying a clause reference. A tool that reads only eCFR can give you a clause's text, its P-or-C type and the prescription that governs it, and nothing more. It cannot tell you which contract types the clause applies to, because that grid lives at a different address in a different format. A tool that reads only the Smart Matrix can give you the grid, but not the authoritative clause text. A complete reference reads both, and says so.

The Smart Matrix is itself a public, machine-readable publication, even though it is served as markup rather than JSON. Its grid is reproducible from a set of query parameters in the URL, so anyone can request the same column and compare it to what a reference claims. MyFCExperts uses exactly that interface, fetches one contract-type column at a time, and validates its own parse on every refresh: expected column headers, a plausible number of clauses, and the expected code vocabulary. If the parse ever comes back wrong, the reference keeps its last good snapshot and shows that it is stale rather than publishing a half-empty grid.

There is a reason to care about this beyond completeness. A clause reference that is quietly incomplete is worse than one that is honestly out of date, because a missing clause reads exactly like a clause that does not apply. The two ways to guard against it are to read the official sources directly and to make the freshness of the data visible, which is why every page here carries an as-of date and a status endpoint reports the age of the last successful refresh.

So the short answer to where the matrix lives: the text and the prescriptions live in the CFR at eCFR, the applicability grid lives at acquisition.gov, and a reference worth trusting tells you which is which and links you to both. That is what MyFCExperts does.