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2s.io US Court Opinion Search
x402
2s.io US Court Opinion Search is a paid API for AI agents from 2s.io, paid per call via x402, $0.0036/call, status unknown (last checked 2026-09-13).
Search ~9 million US court opinions (SCOTUS, federal circuits, state appellate/supreme) by keyword, party name, citation, or docket number with court and date filters
Price / call$0.0036
Success—
StatusUnknown
How this service works
Search US court opinions (SCOTUS, federal circuits, state appellate/supreme — ~9M opinions). Query by free-text (party names, keywords, docket #, citation). Filter by court slug (e.g., "scotus", "ca9", "nysupct"), filing date range, and order (relevance/dateFiled-desc/dateFiled-asc/citeCount-desc). Returns clusterId, caseName, court, year, docket, reporter citations, citationCount, snippet, canonical URL. Discovery-side complement to case-verify. Backed by CourtListener (Free Law Project); underlying opinions are public domain.
Output
Returns a list of matching court opinion records, each with a clusterId, caseName, court identifier, year, docket number, reporter citations, citationCount, a text snippet from the opinion, and a canonical CourtListener URL. Up to 20 results per call.
Example use cases
Example prompt
“Search court opinions for cases about 'qualified immunity' in the 9th Circuit filed after 2018-01-01, sorted by citation count — show me up to 10 results.”
Technical details
Endpoint
GEThttps://2s.io/api/law/case-searchWhen to prefer
Use this endpoint when you need to discover or find court opinions by keyword, party name, citation, or docket number across a broad corpus of ~9M US opinions. Prefer over manual CourtListener browsing when building automated legal research pipelines. Complements a case-verify endpoint when you need discovery first, then verification. Best when you need structured metadata (citations, court, year, snippet) rather than full opinion text.
Side effects
- Query string too short (< 2 chars) or too long (> 500 chars) returns 400 validation error
- Invalid court slug pattern returns 400 error
- Invalid date format for filedAfter/filedBefore returns 400 error
- No matching opinions returns empty results array
- Payment failure (x402) returns 402 before executing search
- Rate limiting or upstream CourtListener unavailability returns 503
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"q": "artificial intelligence",
"limit": 10,
"order": "relevance"
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"_truncated": true,
"_originalSize": 10987
}Tags
x402
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