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 56 state and territory 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: 222,311 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 Over 196,000 Final and Proposed Rules
Query the Federal Register by API: more than 196,000 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 more than 425,000 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: 3,674 presidential documents, what an EO can legally do, and a daily 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: 1,130 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: 1,281 documents, the 2025 edition, the November 1 amendment cycle, application notes, and what is left out.
US Tax Treaty API: Bilateral Treaties and Technical Explanations as Data
Query US bilateral income tax treaties and Treasury Technical Explanations as data, and chain them to the Code, the regulations and IRS guidance.
State Regulations API: 1.5 Million Administrative Rules Across 56 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 currencyNote honestly.
State Court Rules API: 56 Jurisdictions and How to Query Them
The STATE_RULES corpus covers 56 US jurisdictions and over 70,000 court rules. What it holds, how to query it, and the jurisdictions that need a closer read.
State Constitutions API: 53 Jurisdictions With Article and Section Structure
An API for 53 US state and territory constitutions: over 13,000 sections, article and section structure, source links, 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 how to check what is held.
Insurance Compliance Across 50 States: Where the Rules Actually Live
The four layers a multi-state insurer answers to, which layer answers which question, and how one claim-acknowledgment deadline differs across four states.
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.