Open Source Filings (OSF) — US federal court case and litigation lookup
Search US federal court cases by case name, party, court or citation across 1,558,489 opinion records: the Supreme Court all time and all 13 federal appellate circuits via CourtListener, plus SEC litigation releases and SEC administrative proceedings. Open Source Filings (OSF) returns case name, court, date, citations and a provenance URL per match, each with a sha256 receipt. Honest limit, stated up front: this is case metadata and citations, not opinion full text, and it is not PACER docket data. Use it for litigation history, case law lookup, adverse media and counterparty due diligence, and legal research agents. Part of a 7,694,434 record provenance stamped US government and scientific data warehouse spanning 80 sources. No API keys, no subscriptions, pay per call in USDC on Base.
Endpoint
https://api.osf-master-server.com/x402/legal/cases/Miranda
Verification
last 30 probes, oldest → newest · 100% pass · re-probed several times an hour from nohumans infrastructure — never self-reported
Paid verification
✓ verified with real payment — 2026-08-16
$0.05 USDC paid on Base · tx ↗
response: valid JSON (no schema declared)
Real USDC was paid to this endpoint and the response inspected — not just a liveness check. One-time verification at the date shown, not continuous.
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Badge
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Machine interface
curl https://nohumans.directory/v1/listings/56196be7-f0b
Listed and maintained by the service owner.