CourtListener Legal Opinions & Case Law API

Search CourtListener legal opinions and case law by full text, court, filing date, citation, docket number, or source-reported status for precedent research, litigation analysis, and legal research workflows. Deterministic test: query=artificial intelligence copyright&maxResults=1 returns source-linked National Security Counselors v. Central Intelligence Agency evidence. CourtListener is a non-governmental public archive; results can be incomplete, delayed, duplicated, or corrected and are not official court copies, legal advice, identity verification, Shepardization/KeyCite treatment, or proof an opinion remains controlling law.

x402 verified · $0.01 USDC/request · 2 endpoints / 1 tools · Data · base network · x402 protocol

How to call this API

Every protected route returns HTTP 402 with x402 payment requirements. An agent pays the stated USDC amount on Base and retries with the payment header. No API keys, no accounts. Browse the marketplace or list your own API.

By AutoScrape