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.
16 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: 219,114 Federal Regulation Sections, Refreshed Daily
How to query the Code of Federal Regulations by API: the title/chapter/part hierarchy, scoping to 17 C.F.R. Part 240, phrase matching, daily refresh, and the authority links back to the USC.
Federal Register API: Querying 202,526 Final and Proposed Rules
A developer guide to querying the Federal Register by API: documentType and agency filters, published-date versus amendment-year windows, RIN and docket metadata, and how to build a regulatory monitoring pipeline.
Statutes at Large API: Reading Federal Law As Enacted
The US Code is a compilation. The Statutes at Large is the enactment. How to query 110,287 sections of federal session law as JSON, and why uncodified provisions only live here.
Executive Orders API: Presidential Documents, Refreshed Daily
Query US executive orders, proclamations, memoranda, and notices as JSON. What the EXECUTIVE_ACTION corpus holds, 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 over an API: 5,537 FAR sections, 2,877 DFARS sections, and 397 DFARS PGI documents, with clause flow-down and refresh cadences explained.
Federal Rules of Procedure API: FRCP, FRE, FRAP, FRCrP, FRBP and Supreme Court Rules
An API for the Federal Rules of Civil and Criminal Procedure, Evidence, Appellate and Bankruptcy Procedure, plus Supreme Court Rules. 589 sections, monthly refresh.
US Sentencing Guidelines API: Querying the Manual That Sets Federal Exposure
How to query the US Sentencing Guidelines Manual as structured data: 302 sections behind corpusType=SENTENCING_GUIDELINES, the November 1 amendment cycle, application notes, and what the corpus deliberately leaves out.
US Tax Treaty API: Bilateral Treaties and Technical Explanations, Citable by Article
Query US bilateral income and estate tax treaties plus Treasury Technical Explanations as structured data: 119 items behind corpusType=US_TAX_TREATY, article-level addressing, and the four-corpus chain a real cross-border answer needs.
State Regulations API: 1.5 Million Administrative Rules Across 52 Jurisdictions
A developer guide to the state administrative code as an API: the REGULATION corpus token, why it needs a state filter, the citation-shape trap that breaks lookup keys, 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. Here is what it holds, how to query it, and the six jurisdictions it does not cover, each with its real cause.
State Constitutions API: 51 Jurisdictions With Article and Section Structure
An API for all 51 US state constitutions: 13,000 sections across 50 states plus Puerto Rico, article and section structure, official publishers, monthly refresh.
State Insurance Bulletins API: 49 Insurance Departments in One Query
How to pull state department of insurance bulletins from 49 jurisdictions through one API call, why the naming differs in every state, and what the corpus deliberately 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 the same compliance question across states with API calls instead of 50 browser tabs.
GovInfo Is Free and Authoritative. Here Is What You Still Have to Build.
An honest build-versus-buy read on govinfo.gov, congress.gov, and the eCFR: what the US government publishes for free, and the seven things it does not publish that you end up building yourself.
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.