What Loupe holds.

Name: Loupe's index of citations to American case law
Creator: Loupe

18,123,725 citations to American case law, from federal and state courts. For 6,951,942 opinions Loupe knows the last page, so a pin cite can be checked. The newest decision in the index is from 18 August 2026.

Each day Loupe reads 100 courts’ own sites. It has collected 29,971 decisions from them so far.

Figures from the inventory of 26 September 2026.

Find a case

By the parties’ names, or by its citation. Only what Loupe holds, and free.

Try , , or .

Collected lately

Decisions the crawler brought in from the courts’ own sites, newest first.

The day’s list appears here after the crawler’s next run.

Held, court by court

Citations by the courts that decided them, and how many of their opinions Loupe knows the pages of.

From Loupe’s inventory.
Court system	Citations	Pages known

By state

State	Citations	Pages known	Statutes checked

The courts Loupe reads each day

Where it comes from

Every source Loupe checks against, and what each is for. All are public; none of them produced, reviewed or endorsed Loupe.

Case law

CourtListener, a Free Law Project service: its public-domain files are the citation index, which case each citation names; and its RECAP archive of federal dockets, for a case cited by its docket number.
Harvard Law School Library’s Caselaw Access Project, public domain: where each opinion ends, the printed page and the text, to about 2019.
The courts’ own sites, read each day by Loupe’s crawler, built on Free Law Project’s juriscraper: recent decisions and their full text.
Later courts’ opinions that cite a recent decision: how its citation is learned before a reporter prints it.
Free Law Project’s reporters-db: which reporters exist, so one that was never published is caught.

Statutes, regulations and rules

GovInfo, from the U.S. Government Publishing Office: the U.S. Code, public laws, the Statutes at Large and the Federal Register.
eCFR and the Federal Register, from the Office of the Federal Register: federal regulations.
Congress.gov, from the Library of Congress: bills and committee reports.
uscourts.gov: the Federal Rules of Civil, Criminal, Appellate and Bankruptcy Procedure and of Evidence.
Cornell’s Legal Information Institute: the U.S. Code, the rules and the Constitution, to read.
California Legislative Information and the Florida Senate: those states’ statutes.
The American Law Institute’s catalogue: the Restatements.

Links and references

Each link in a filing, opened as it is today, and the Internet Archive’s Wayback Machine for a snapshot of what it showed.
Crossref: DOIs.

For AI agents

An agent can ask Loupe before it cites anything. Free, with no account and no key.

Check a citationGET https://loupe.legal/api/cite?c=556 U.S. 662, 678
Whether it exists, which case it names, and whether the pin falls inside the opinion.
Find a caseGET https://loupe.legal/api/search?q=Miranda v. Arizona
The cases Loupe holds by that name, with their citations and pages.
What is heldGET https://loupe.legal/api/coverage
The figures at the top of this page.
As an MCP serverhttps://loupe.legal/mcp-public
Two tools, check_citation and search_cases, for Claude, ChatGPT or any MCP client.

Add format=md, or ask for text/markdown, for Markdown. Described in OpenAPI, llms.txt and AGENTS.md, and listed at /.well-known/api-catalog.

Five hundred questions a day from one network. Every answer says what was checked and what was not; “not found” is never said to mean “does not exist”. Not legal advice.

GET /api/cite?c=556 U.S. 662, 790

{
  "citation": "556 U.S. 662",
  "verdict": "mismatch",
  "in_words": "Real, but described wrongly",
  "case": "Ashcroft v. Iqbal",
  "findings": [{
    "problem": "The pin cite is page 790, but the opinion runs 662–700."
  }]
}