# x402 tools – US Statute Citation Verifier

> x402 tools – US Statute Citation Verifier is a paid API for AI agents from x402-tools-production-2755.up.railway.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-01).

Finds up to 25 US statute citations in a document, checks each exists and is currently in force, and optionally validates quoted passages against the actual statutory text.

## Facts

- Endpoint: GET https://x402-tools-production-2755.up.railway.app/tools/statute-verify?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-tools-us-statute-citation-verifier-afebcf2e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Q6QdHDbknJsp9RxaGOxw9

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability x402-tools-us-statute-citation-verifier-afebcf2e
```

Example prompt: Can you check this legal memo for hallucinated or repealed statute citations? Paste the full memo text and verify that every US code citation actually exists and is still in force, and flag any quoted passages that don't match the real statutory language.

## When to prefer this

Use this endpoint when you need to fact-check US statutory citations in any legal document, AI-generated answer, memo, brief, or contract. It is uniquely suited for catching hallucinated statute numbers and repealed laws — a common failure mode of LLMs in legal contexts. Prefer this over generic web search when you need authoritative, structured validation against a curated US law corpus rather than unstructured results.

## Known failure modes

- No citations found in text — not charged, returns empty result
- Citation exists but has been repealed — flagged as not in force
- Quoted passage does not match actual statutory text — flagged as mismatch
- Text exceeds 100,000 character limit — should use POST endpoint instead
- State-specific citations may require the 'state' parameter to resolve correctly
- Non-US or international statute citations are not supported

## How this service works

Use to catch hallucinated or repealed statute citations in a brief, memo or AI answer. Finds up to 25 US statute citations in text, checks each exists and is in force, and checks quoted passages against the section. Not charged if none are found. Data: Open US Law v2026.08 (CC BY 4.0). Not legal advice.

## Output

Returns a list of up to 25 detected US statute citations from the input text, each with: whether the citation exists in current US law, whether it is currently in force (not repealed), and optionally whether any quoted passage from the document matches the actual statutory text. Optionally includes the full section text for each citation. Not charged if no citations are found.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "text"
     ],
     "properties": {
      "text": {
       "type": "string",
       "description": "Document text, up to 100000 characters (use POST with a JSON body for long text)"
      },
      "state": {
       "type": "string",
       "description": "Default state for citations that don't name one"
      },
      "quotes": {
       "enum": [
        "true",
        "false"
       ],
       "type": "string",
       "description": "Check quoted passages against the cited section (default true)"
      },
      "include_text": {
       "enum": [
        "true",
        "false"
       ],
       "type": "string",
       "description": "Include each section's full text (default false)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-tools-us-statute-citation-verifier-afebcf2e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-tools-production-2755.up.railway.app](https://www.zero.xyz/host/x402-tools-production-2755.up.railway.app/llms.txt)