# SiteCheck Company Records – US Court Opinions Search (Justia Case Law)

> 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.

## Facts

- Endpoint: GET https://api.companyrecords-api.workers.dev/api/gov/justia-case-law?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-company-records-us-court-opinions-search-justia-case-law-ac0cfe4d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oIaKU3dQizGDKhGOK89Ar

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability sitecheck-company-records-us-court-opinions-search-justia-case-law-ac0cfe4d
```

Example prompt: Search US court opinions for cases about 'fair use' and artificial intelligence, filter to the Ninth Circuit (ca9), sorted by most cited, and show me the case name, court, filing date, how many opinions cite each case, and the opinion link.

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "q"
     ],
     "properties": {
      "q": {
       "type": "string",
       "description": "Search words; quotes for phrases, e.g. \"qualified immunity\" (required)"
      },
      "court": {
       "type": "string",
       "description": "Optional CourtListener court IDs, space-separated, e.g. scotus, ca9, cal"
      },
      "order": {
       "type": "string",
       "description": "relevance (default), newest, oldest or cited"
      },
      "cursor": {
       "type": "string",
       "description": "Cursor from a previous answer's next field"
      },
      "filedAfter": {
       "type": "string",
       "description": "Optional earliest filing date YYYY-MM-DD"
      },
      "filedBefore": {
       "type": "string",
       "description": "Optional latest filing date YYYY-MM-DD"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "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"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-company-records-us-court-opinions-search-justia-case-law-ac0cfe4d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.companyrecords-api.workers.dev](https://www.zero.xyz/host/api.companyrecords-api.workers.dev/llms.txt)