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LexRails Legal Citation Checker
x402
LexRails Legal Citation Checker is a paid API for AI agents from lex.chainverdict.xyz, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-15).
Deterministically checks whether a legal citation is real or fabricated, returning a boolean validity result with attestation
Price / call$0.008
Success—
StatusUnknown
How this service works
Structural check of a single US case citation: catches impossible reporter volumes, unknown reporters, malformed patterns — the fabrication signals. Verdict: impossible / unknown-reporter / plausible.
Output
Returns a JSON object containing a 'valid' boolean indicating whether the citation is real or fabricated, plus an '_attestation' object providing a cryptographic or structured attestation of the check result, along with any additional metadata fields
Example use cases
Pre-filing brief citation audit
“I'm about to file a legal brief and I need you to verify this citation is legitimate before I submit: 'Chevron U.S.A., Inc. v. Natural Resources Defense Council, 467 U.S. 837 (1984)' — is it real?”
AI-generated legal memo review
“An AI wrote a legal memo for me and I'm worried it hallucinated some references. Can you check if this citation is fabricated: '42 U.S.C. § 1983, as interpreted in Monell v. Department of Social Services, 436 U.S. 658 (1978)'?”
Legal research citation spot-check
“I found this statute citation in a research report and I want to make sure it's real before I rely on it: 'Sherman Antitrust Act, 15 U.S.C. §§ 1–7' — can you run a deterministic check on it?”
Technical details
Endpoint
GEThttps://lex.chainverdict.xyz/v1/cite/checkWhen to prefer
Choose LexRails when you need a deterministic, machine-verifiable check for legal citation authenticity — especially to guard against AI hallucination in legal documents, briefs, or research. Prefer this over LLM-based citation checks when you need an attestation artifact, auditability, or when cost-per-call micropricing via USDC is acceptable. Best suited for single-citation spot checks in automated legal workflows.
Side effects
- Missing required 'q' parameter returns a 400-level error
- Ambiguous or malformed citation strings may produce indeterminate results
- Payment failure via x402 blocks access with a 402 response
- Network timeouts on the Base blockchain payment layer
- Unknown or highly obscure citations may return false negatives
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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