The US Primary Law Corpus, Source by Source
Every body of US primary law you can query by API: the Code of Federal Regulations, the Federal Register, the Statutes at Large, executive orders, federal rules, and the statutes, regulations, constitutions and court rules of all 52 jurisdictions.
17 posts in this cluster
Types of Primary Law in the US: The Complete Map (Statutes, Regs, Cases, and More)
The eight types of primary law in the US: constitutions, statutes, regulations, case law, court rules, executive actions, treaties, and ordinances, explained.
CFR API: 222,251 Federal Regulation Sections, Refreshed Daily
Query the CFR by API: the title, chapter and part hierarchy, scoping to 17 C.F.R. Part 240, phrase matching, daily refresh, and authority links to the USC.
CFR Annual Editions API: Point-in-Time Regulations with corpusType=CFR_ANNUAL
GPO's 31 published CFR annual editions, 1996 to 2026, as corpusType=CFR_ANNUAL. How asOf resolves a date to an edition, and what it will not answer.
Federal Register API: Querying 196,237 Final and Proposed Rules
Query the Federal Register by API: 196,237 rules, documentType and agency filters, published-date versus amendment-year windows, and RIN and docket metadata.
Statutes at Large API: Reading Federal Law As Enacted
The US Code is a compilation; the Statutes at Large is the enactment. Query 110,287 sections of federal session law as JSON, and why uncodified text lives here.
Executive Orders API: Presidential Documents, Refreshed Daily
Query US executive orders, proclamations and memoranda as JSON: 3,788 presidential documents, what an EO can legally do, and a daily-diff monitoring recipe.
FAR and DFARS API: Government Contract Clauses You Can Query by Number
Query FAR and DFARS clauses by number: 3,118 FAR sections, 1,705 DFARS sections and 397 PGI documents, with clause flow-down and refresh cadence explained.
Federal Rules of Procedure API: FRCP, FRE, FRAP, FRCrP, FRBP and Supreme Court Rules
An API for the FRCP, FRCrP, FRE, FRAP and FRBP plus Supreme Court Rules: 589 sections, six source codes, monthly refresh, and the December 1 amendment cycle.
US Sentencing Guidelines API: Querying the Manual That Sets Federal Exposure
Query the US Sentencing Guidelines Manual as data: 302 sections, the November 1 amendment cycle, application notes, and what the corpus leaves out.
US Tax Treaty API: Bilateral Treaties and Technical Explanations, Citable by Article
Query US bilateral tax treaties and Technical Explanations as data: 119 items, article-level addressing, and the four-corpus chain a treaty answer needs.
State Regulations API: 1.5 Million Administrative Rules Across 52 Jurisdictions
The state administrative code as an API: the REGULATION token, why it needs a state filter, the citation-shape trap, and how to read currentThrough honestly.
State Court Rules API: 46 Jurisdictions, and an Honest Map of the Six Gaps
The STATE_RULES corpus covers 46 US jurisdictions and about 47,600 court rules. What it holds, how to query it, and the six jurisdictions it does not cover.
State Constitutions API: 51 Jurisdictions With Article and Section Structure
An API for 51 US state constitutions: about 13,000 sections, article and section structure, official publishers, and a monthly refresh cadence.
State Insurance Bulletins API: 49 Insurance Departments in One Query
Pull state insurance department bulletins from 49 jurisdictions in one API call, why the naming differs in every state, and what the corpus leaves out.
Insurance Compliance Across 50 States: Where the Rules Actually Live
The four layers that bind a multi-state insurer, which layer answers which question, and how to run one compliance question across states with API calls.
GovInfo API vs a Legal Data API: What You Still Have to Build
What govinfo.gov, congress.gov and the eCFR publish free, and the seven things they do not, which you end up building yourself. An honest build-versus-buy read.
Searching US Statutes and Regulations With AI: Is the Section Still Current?
How to search US Code, CFR, and 50-state statutes with AI, then check the amendment history and whether old case law interpreting a section is still good law.