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CourtListener Federal Court Opinion Search
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CourtListener Federal Court Opinion Search is a paid API for AI agents from legal.memoryapi.org, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).
Search federal court opinions and cases from the CourtListener/RECAP Archive by keyword, party, court, or date range.
Price / call$0.01
Success—
StatusDown
How this service works
Federal court opinion search via CourtListener. Search 10M+ opinions, docket records, and case history. Pay-per-request via x402 protocol on Base mainnet.
Output
Returns a list of matching federal court opinions and cases from the CourtListener/RECAP Archive, including case names, docket numbers, court identifiers, filing dates, judges, and relevant citation information for each result.
Example use cases
Example prompt
“Search federal court opinions for cases about 'patent infringement' involving Apple, filed after 2020 in the Ninth Circuit — pull back the top results with case names, docket numbers, and filing dates.”
Technical details
Endpoint
GEThttps://legal.memoryapi.org/x402/legal/searchWhen to prefer
Use this endpoint when you need to search across the full corpus of federal court opinions and dockets from CourtListener/RECAP — ideal for legal research, company litigation due diligence, case law retrieval by topic, or finding cases by party name. Prefer this over general web search when you need structured case metadata (docket numbers, courts, dates) rather than narrative summaries.
Side effects
- No results found for overly narrow or obscure queries — returns empty result set
- Rate limiting or payment failure (x402) — returns 402 Payment Required
- Malformed query parameters — returns 400 Bad Request
- CourtListener upstream unavailable — returns 503 or timeout
- Query too broad returns truncated or paginated results with no clear cutoff signal
Input
{
"q": "patent infringement",
"court": "ca9",
"limit": 10,
"date_after": "2020-01-01"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | — |
Output
{
"count": 20,
"query": "patent infringement",
"source": "CourtListener / RECAP Archive",
"results": [
{
"url": "https://www.courtlistener.com/opinion/10160745/cpc-patent-technologies-pty-ltd-v-apple-inc/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [
"119 F.4th 1126"
],
"case_name": "Cpc Patent Technologies Pty Ltd. v. Apple Inc.",
"date_filed": "2024-10-24",
"docket_number": "23-3449"
},
{
"url": "https://www.courtlistener.com/opinion/6469762/cpc-patent-techs-pty-ltd-v-apple-inc/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [
"34 F.4th 801"
],
"case_name": "Cpc Patent Techs. Pty Ltd. v. Apple, Inc.",
"date_filed": "2022-05-18",
"docket_number": "21-16212"
},
{
"url": "https://www.courtlistener.com/opinion/9367680/city-of-reno-v-netflix-inc/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [],
"case_name": "CITY OF RENO V. NETFLIX, INC.",
"date_filed": "2022-10-28",
"docket_number": "21-16560"
},
{
"url": "https://www.courtlistener.com/opinion/6620484/chelsea-hamilton-v-wal-mart-stores-inc/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [
"39 F.4th 575"
],
"case_name": "Chelsea Hamilton v. Wal-Mart Stores, Inc.",
"date_filed": "2022-06-30",
"docket_number": "19-56161"
},
{
"url": "https://www.courtlistener.com/opinion/4856659/metal-jeans-inc-v-metal-sport-inc/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [
"987 F.3d 1242"
],
"case_name": "Metal Jeans, Inc. v. Metal Sport, Inc.",
"date_filed": "2021-02-16",
"docket_number": "19-55923"
},
{
"url": "https://www.courtlistener.com/opinion/10304970/legalforce-rapc-worldwide-pc-v-legalforce-inc/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [
"124 F.4th 1122"
],
"case_name": "Legalforce Rapc Worldwide, Pc v. Legalforce, Inc.",
"date_filed": "2024-12-27",
"docket_number": "23-2855"
},
{
"url": "https://www.courtlistener.com/opinion/10313402/tangle-inc-v-aritzia-inc/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [],
"case_name": "Tangle, Inc. v. Aritzia, Inc.",
"date_filed": "2025-01-14",
"docket_number": "23-3707"
},
{
"url": "https://www.courtlistener.com/opinion/6247201/united-states-v-jeremy-schlenker/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [
"24 F.4th 1301"
],
"case_name": "United States v. Jeremy Schlenker",
"date_filed": "2022-02-01",
"docket_number": "20-30141"
},
{
"url": "https://www.courtlistener.com/opinion/10366585/bigfoot-ventures-limited-v-knighton/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [
"132 F.4th 1138"
],
"case_name": "Bigfoot Ventures Limited v. Knighton",
"date_filed": "2025-03-28",
"docket_number": "23-2940"
},
{
"url": "https://www.courtlistener.com/opinion/10055595/cr-bard-inc-v-atrium-medical-corporation/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [
"112 F.4th 1182"
],
"case_name": "C.R. Bard, Inc. v. Atrium Medical Corporation",
"date_filed": "2024-08-23",
"docket_number": "23-16020"
},
{
"url": "https://www.courtlistener.com/opinion/4839812/eli-attia-v-google-llc/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [
"983 F.3d 420"
],
"case_name": "Eli Attia v. Google LLC",
"date_filed": "2020-12-16",
"docket_number": "19-15771"
},
{
"url": "https://www.courtlistener.com/opinion/4740705/vip-products-llc-v-jack-daniels-properties-inc/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [
"953 F.3d 1170"
],
"case_name": "Vip Products LLC v. Jack Daniel's Properties, Inc.",
"date_filed": "2020-03-31",
"docket_number": "18-16012"
},
{
"url": "https://www.courtlistener.com/opinion/10633338/doctors-best-inc-v-natures-way-products-llc/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [],
"case_name": "Doctor's Best, Inc. v. Nature's Way Products, LLC",
"date_filed": "2025-07-15",
"docket_number": "24-2719"
},
{
"url": "https://www.courtlistener.com/opinion/6905394/lang-van-inc-v-vng-corporation/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [
"40 F.4th 1034"
],
"case_name": "Lang Van, Inc. v. Vng Corporation",
"date_filed": "2022-07-21",
"docket_number": "19-56452"
},
{
"url": "https://www.courtlistener.com/opinion/9367662/san-antonio-winery-inc-v-jiaxing-micarose-trade-co/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [],
"case_name": "SAN ANTONIO WINERY, INC. V. JIAXING MICAROSE TRADE CO.",
"date_filed": "2022-11-14",
"docket_number": "21-56036"
},
{
"url": "https://www.courtlistener.com/opinion/9489621/bbk-tobacco-foods-llp-v-central-coast-agriculture-inc/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [
"97 F.4th 668"
],
"case_name": "Bbk Tobacco & Foods LLP v. Central Coast Agriculture, Inc.",
"date_filed": "2024-04-01",
"docket_number": "22-16190"
},
{
"url": "https://www.courtlistener.com/opinion/5305533/saved-magazine-v-spokane-police-department/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [],
"case_name": "Saved Magazine v. Spokane Police Department",
"date_filed": "2021-12-09",
"docket_number": "20-36073"
},
{
"url": "https://www.courtlistener.com/opinion/5305151/saved-magazine-v-spokane-police-department/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [
"19 F.4th 1193"
],
"case_name": "Saved Magazine v. Spokane Police Department",
"date_filed": "2021-12-09",
"docket_number": "20-36073"
},
{
"url": "https://www.courtlistener.com/opinion/9460521/punchbowl-inc-v-aj-press-llc/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [
"90 F.4th 1022"
],
"case_name": "Punchbowl, Inc. v. Aj Press, LLC",
"date_filed": "2024-01-12",
"docket_number": "21-55881"
},
{
"url": "https://www.courtlistener.com/opinion/9426575/orlando-garcia-v-gateway-hotel-lp/",
"court": "Court of Appeals for the Ninth Circuit",
"snippet": null,
"citation": [
"82 F.4th 750"
],
"case_name": "Orlando Garcia v. Gateway Hotel L.P.",
"date_filed": "2023-09-15",
"docket_number": "21-55926"
}
],
"success": true,
"total_available": 75
}Schema · Response
{
"example": {
"count": 10,
"query": "Apple antitrust",
"source": "CourtListener / RECAP Archive",
"results": [
{
"url": "https://www.courtlistener.com/opinion/...",
"court": "ca9",
"snippet": "...antitrust...",
"citation": "67 F.4th 946",
"case_name": "Epic Games v. Apple Inc.",
"date_filed": "2021-09-10",
"docket_number": "21-16695"
}
],
"success": true,
"total_available": 342
}
}Tags
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