GhostCite API

Verify legal citations and quotations deterministically, with no generative AI in the verification loop. Submit citations (or a document) and get a per-item verdict, structured evidence, and a link to the supporting authority.

What it does

• Detects hallucinations: fabricated cases, wrong pincites, and quotes that don’t appear in the authority.
• Explains every verdict with deterministic, legal-attribute evidence (cited vs. found).
• Identifies the supporting authority and gives you an inspectable link to the court record.

Who it’s for

Teams building legal-AI drafting, brief review, or e-discovery tools that need a verification layer they can trust, one that returns the same facts for the same input, and shows its work.

Why deterministic matters

GhostCite does not use a language model to decide whether a citation is real. It resolves each citation against indexed court records and applies explicit, rule-based checks. The same input under the same record state always yields the same verdict, auditable, reproducible, and safe to put in front of a court.

One request, at a glance

POST https://app.rule26ai.com/api/v1/verify
Authorization: Bearer <YOUR_API_KEY>
Content-Type: application/json

{ "items": [
  { "id": "r_1", "type": "case",
    "rawText": "Brown v. Board of Education, 347 U.S. 483 (1954)" }
] }

The response gives each item a verdict (verified / warning / critical), optional evidence.comparisons, the resolved opinion, and request usage. See the Quickstart for a full response walkthrough.

Start here

1. Get an API key from your account’s Developer Tools.
2. Run the Quickstart in curl, JavaScript, or Python.
3. Learn how to read structured evidence and handle errors & rate limits.