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Veridictum Legal — Single Citation Verifier
x402
Veridictum Legal — Single Citation Verifier is a paid API for AI agents from veridictum.legal, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-12).
Verifies a single legal citation against a 14.2M-case corpus (CourtListener), detecting whether the case name matches the reporter citation or reveals a hallucinated reference.
Price / call$0.01
Success—
StatusUnknown
How this service works
Verify one legal citation. Body: {"citation": "<string>"} - full ("Miranda v. Arizona, 384 U.S. 436 (1966)") or bare ("384 U.S. 436"); the case name enables mismatch detection. Deterministic: regex plus cache / local corpus / CourtListener, no LLM in the path. status=verified (name confirmed), suspicious (reporter resolves to a DIFFERENT case - the fabrication signature), or not_found. verified=false is a finding, not an error: do not retry. Only verified results are cached.
Output
Returns a status field of 'verified' (case name confirmed to match the reporter citation), 'suspicious' (the reporter citation resolves to a DIFFERENT case — the hallucination signature), or 'not_found' (citation does not exist in the corpus). Also returns a name_match field ('confirmed', 'mismatch', or 'not_checked' for bare citations). A non-verified result is a definitive finding — agents should not retry.
Example use cases
AI brief hallucination check
“I just got a legal memo from an AI assistant with this citation: 'Chevron U.S.A. Inc. v. Natural Resources Defense Council, 467 U.S. 837 (1984)' — can you verify it's real and that the case name isn't mismatched to the wrong reporter citation?”
Law student research validation
“Before I submit my paper, can you check whether 'Miranda v. Arizona, 384 U.S. 436 (1966)' is a verified citation with the name correctly matched to that volume and page?”
Suspicious citation audit
“A contract I'm reviewing cites 'Smith v. Jones, 529 U.S. 205 (2000)' — can you run that through Veridictum to see if it's verified, suspicious (name mismatch), or just not found at all?”
Technical details
Endpoint
POSThttps://veridictum.legal/api/v1/agent/verify?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to verify a single legal citation with high deterministic accuracy — especially when you have a full citation including the case name and need to detect name-reporter mismatches (the hallucination signature). Prefer the batch sibling endpoint when verifying multiple citations at once. This endpoint is purpose-built for detecting AI-hallucinated legal references and is backed by a 14.2M-case corpus with no LLM in the verification path, making it more reliable than asking an LLM to self-verify its own citations.
Side effects
- Bare citation without case name returns name_match='not_checked' — mismatch detection is unavailable
- not_found is a valid finding, not a transient error — retrying will return the same result
- Citations outside the 14.2M-case corpus may return not_found even if they exist
- Malformed citation strings (missing volume or page) may fail regex parsing
- status=suspicious is itself the hallucination signal and should be treated as a finding, not an error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| citation | string | One legal citation. Full ("Miranda v. Arizona, 384 U.S. 436 (1966)") or bare ("384 U.S. 436"). Supplying the case name is what enables mismatch detection; a bare citation can only be confirmed to exist and returns name_match='not_checked'. |
Tags
x402
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