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Full detail: Where this data comes from
CourtListener is a free legal research platform operated by the Free Law Project, a nonprofit working to make the legal ecosystem more equitable and competitive. It provides a comprehensive REST API for accessing US court opinions, PACER docket data, oral arguments, judge biographical data, financial disclosures, and citation networks from federal and state courts.
- Case Law — Over 9 million court opinions from federal and state courts dating back to 2009
- PACER Data — Approximately 500 million items from the federal PACER court filing system via the RECAP Archive
- Oral Arguments — 3.4+ million minutes of oral argument audio, the largest internet collection
- Judge Data — Biographical records for 16,000+ federal and state judges
- Financial Disclosures — Judge financial disclosure documents
- Citation Analysis — Citation lookup and citation network visualization
- Search and Alerts — Full-text search API and email/webhook alerts for cases and search terms
- Base URL:
https://www.courtlistener.com/api/rest/v4/ - Version: v4.4
- Authentication: Token (recommended), Cookie/Session, or HTTP Basic
- Formats: JSON (default), HTML, XML
| Tier | Price | Rate Limits |
|---|---|---|
| Free | $0 | 5/min, 50/hr, 125/day |
| Tier 1 | $10/mo or $100/yr | 10/min, 75/hr, 300/day |
| Tier 2 | $25/mo or $250/yr | 15/min, 150/hr, 600/day |
| Tier 3 | $50/mo or $500/yr | 20/min, 250/hr, 1,000/day |
| Tier 4 | $100/mo or $1,000/yr | 25/min, 300/hr, 1,400/day |
| EDU | Free (.edu email) | Tier 1 limits |
- CourtListener Website
- API Documentation
- Membership & Pricing
- GitHub Organization
- Python SDK
- Free Law Project Blog
apis.yml— APIs.json 0.19 profile for CourtListenerplans/court-listener-plans-pricing.yml— Detailed membership plan and pricing informationrate-limits/court-listener-rate-limits.yml— API rate limit specifications per tierfinops/court-listener-finops.yml— FinOps guidance for managing API costs
Maintained by Kin Lane / API Evangelist