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RealCite Case Citation Verifier
x402
RealCite Case Citation Verifier is a paid API for AI agents from goodsong.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Verifies whether a legal case citation exists in CourtListener and whether the provided case name matches the canonical record, catching fabricated citations.
Price / call$0.01
Success—
StatusUnknown
How this service works
Verify a legal case citation: does it exist, and does the given case name match the canonical record? Catches a fabricated case citation, including a real-looking citation number paired with an invented case name. Checked against CourtListener. Does not check whether a case is still good law -- no free authoritative source publishes that.
Output
Returns whether the given case citation exists in CourtListener's database, and if a case name was provided, whether it matches the canonical record for that citation. Flags fabricated or mismatched citations but does not assess whether the case is still good law.
Example use cases
Hallucination check in AI legal brief
“I asked an AI to draft a legal memo and it cited 'Johnson v. State, 412 U.S. 218' — can you verify that citation exists and that the case name is correct? I'm worried it made it up.”
Verifying citation before court filing
“Before I submit this filing, can you check that '573 U.S. 513' is a real case and that it corresponds to 'Riley v. California'?”
Fact-checking a citation in a student paper
“A law student's paper cites 'Brown v. Board of Education, 347 U.S. 483' — can you confirm that citation is real and the case name matches?”
Technical details
Endpoint
POSThttps://goodsong.dev/verify/caseWhen to prefer
Use this endpoint when an AI agent or human has produced a legal case citation and you need to verify it isn't fabricated — especially when the citation number looks plausible but the case name may be invented. Best for checking U.S. court cases indexed by CourtListener. Not suitable for checking whether a case is still valid precedent (Shepardizing).
Side effects
- Citation not found in CourtListener (case may be real but not indexed)
- Case name provided does not match canonical record for an existing citation
- Citation format is malformed or unparseable
- CourtListener API unavailable or rate-limited
- Does not indicate whether a case has been overruled or is still good law
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| citation | string | The case citation, e.g. '576 U.S. 644'. |
| case_name | string | Optional case name to cross-check against the citation. |
Tags
x402
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