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SiteCheck Company Records – US Court Opinions Search (Justia Case Law)
x402
SiteCheck Company Records – US Court Opinions Search (Justia Case Law) is a paid API for AI agents from api.companyrecords-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-24).
Searches US federal and state court opinions by keyword, returning case metadata including court, citation, judges, filing dates, and opinion URL, with filtering by court and date range.
Price / call$0.002
Success—
StatusUnknown
How this service works
Pay-per-call company registry, government, legal and B2B data tools for AI agents, from official registers and public sources. Payment: x402, USDC on Base, Solana, Arc, Polygon, Arbitrum, Monad, World Chain, Optimism, Avalanche, Celo or Stellar, or RLUSD/XRP on the XRP Ledger. No signup, no API key; a failed call is not charged.
Output
A JSON object containing a list of matching court opinions (each with case name, court name, court ID, docket number, official/neutral citations, date filed, date argued, judges, publication status, cited-by count, a text snippet, and a CourtListener opinion URL), plus total match count, current sort order, the source URL used, and a cursor for the next page if more results exist.
Example use cases
Copyright litigation research on AI training data
“Find me federal court opinions mentioning 'copyright' and 'training data', filtered to cases filed after 2022-01-01, sorted by newest — I need the case name, court, docket number, and a snippet for each.”
SCOTUS precedent lookup for qualified immunity
“Search for Supreme Court opinions on 'qualified immunity', sorted by most cited, so I can see which rulings have had the most influence on later decisions.”
State court decisions on non-compete agreements
“Look up California state court opinions (court ID: cal) about 'non-compete agreement', filed between 2020-01-01 and 2024-12-31, sorted by relevance, and give me the case names, dates, and links.”
Technical details
Endpoint
GEThttps://api.companyrecords-api.workers.dev/api/gov/justia-case-law?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need structured metadata about US court opinions — federal or state — searchable by keyword, court, and filing date. It is ideal for legal research tasks, citation analysis, tracking precedent, and identifying relevant case law without needing a full legal database subscription. Prefer it over general web search when you need structured fields like docket numbers, citation strings, judge names, and cited-by counts directly from CourtListener's database.
Side effects
- Missing required 'q' parameter returns an error
- Invalid court ID returns empty results or an error
- Malformed date strings in filedAfter/filedBefore cause query failure
- Very broad queries may return thousands of results with limited per-page detail
- Cursor from a different query context may return unexpected results
- Rate limiting or payment failure results in a 402 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"q": "\"fair use\" artificial intelligence",
"next": null,
"cases": [
{
"url": "https://www.courtlistener.com/opinion/10988837/thomson-reuters-enterprise-centre-gmbh-v-ross-intelligence-inc/",
"court": "Court of Appeals for the Third Circuit",
"judges": null,
"status": "Published",
"citedBy": 0,
"courtId": "ca3",
"snippet": "UNITED STATES COURT OF APPEALS FOR THE THIRD CIRCUIT No. 25-2153 THOMSON REUTERS ENTERPRISE CENTRE GMBH; WEST PUBLISHING CORP v. ROSS INTELLIGENCE INC, Appellant _____________________________ On Appeal from the U.S. District Court, D. Del. Judge Stephanos Bibas,* No. 1:20-cv-00613 Before: RESTREPO, …",
"caseName": "Thomson Reuters Enterprise Centre GmbH v. Ross Intelligence Inc",
"citations": [],
"dateFiled": "2026-09-30",
"dateArgued": "2026-06-11",
"docketNumber": "25-2153",
"courtCitation": "3rd Cir."
},
{
"url": "https://www.courtlistener.com/opinion/10838832/american-society-for-testing-materials-v-upcodes-inc/",
"court": "Court of Appeals for the Third Circuit",
"judges": null,
"status": "Published",
"citedBy": 0,
"courtId": "ca3",
"snippet": "U.S. COURT OF APPEALS FOR THE THIRD CIRCUIT No. 24-2965 AMERICAN SOCIETY FOR TESTING & MATERIALS, d/b/a ASTM International, Appellant v. UPCODES, INC.; GARRETT REYNOLDS; SCOTT REYNOLDS _____________________________ Appeal from the U.S. District Court, E.D. Pa. Judge Anita B. Brody, No. 2:24-cv-01895…",
"caseName": "American Society for Testing & Materials v. UPCODES Inc",
"citations": [],
"dateFiled": "2026-04-07",
"dateArgued": "2025-09-19",
"docketNumber": "24-2965",
"courtCitation": "3rd Cir."
}
],
"count": 19,
"court": null,
"order": "newest",
"total": 19,
"source": "https://www.courtlistener.com/api/rest/v4/search/?q=%22fair+use%22+artificial+intelligence&type=o&order_by=dateFiled+desc",
"checkedAt": "2026-10-23T09:37:06.947Z"
}
}Tags
x402
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