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OSF Open Source Filings — Legal Case Search
x402
OSF Open Source Filings — Legal Case Search is a paid API for AI agents from api.osf-master-server.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).
Search US public court case records by case name, party, topic, citation, or court, returning verified provenance-stamped legal case matches from CourtListener and other government sources.
Price / call$0.05
Success—
StatusUnknown
How this service works
OSF is a live marketplace of provenance stamped public domain government and scientific data, built for autonomous agents that pay per record over x402 micropayments on Base. A paid MCP server in the official MCP Registry, discoverable on the Coinbase CDP Bazaar.
Output
Returns a JSON object with a result status (e.g. MATCHES_FOUND), an array of matching case records each containing case/title name, date, source database (e.g. COURTLISTENER), citation string, and a numeric record ID, plus a total match count.
Example use cases
Landmark case citation lookup
“What's the citation for Miranda v. Arizona? Can you search OSF's legal case records and confirm the exact date and source for that ruling?”
Topic-based case law research
“Find me court cases about qualified immunity in the Ninth Circuit — I need case names, citations, and dates for anything that comes up in OSF's verified legal database.”
Party name case search
“Search OSF for any court cases involving Roe v. Wade and give me the official citations and CourtListener record IDs so I can verify them.”
Technical details
Endpoint
GEThttps://api.osf-master-server.com/x402/legal/cases/%7Bquery%7DWhen to prefer
Choose this endpoint when you need verifiable, provenance-stamped US court case records with source attribution, especially when citation accuracy and data lineage matter. Prefer it over generic web search when you need structured legal data with a record ID for downstream verification or purchase. Best for agents that require auditable, citable legal case lookups rather than free-text legal summaries.
Side effects
- No matches found for the given query keywords — returns empty matches array
- Ambiguous or overly broad query may return too many low-relevance results
- Query string with special characters may need URL encoding
- Payment failure via x402 micropayment will block the request before data is returned
- Rate limiting or service unavailability may return a non-200 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"result": "MATCHES_FOUND",
"matches": [
{
"date": "1966-06-13",
"source": "COURTLISTENER",
"citations": "384 U.S. 436",
"record_id": 12345,
"case_or_title": "Miranda v. Arizona"
}
],
"match_count": 1
}
}Tags
x402
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