# Preflight EU Legal Citation Checker

> Preflight EU Legal Citation Checker is a paid API for AI agents from preflight402.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-02).

Verifies that a cited EU law instrument, article, and quoted text are accurate before publishing a claim, returning the official article text and a EUR-Lex link.

## Facts

- Endpoint: POST https://preflight402.com/v1/legal/cite-check?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/preflight-eu-legal-citation-checker-e60dc16b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GBVGJjX9_v_4W_xL2Hee3

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 preflight-eu-legal-citation-checker-e60dc16b -d '<json body>'
```

Example prompt: Before I publish this post, check whether the text 'controllers shall implement appropriate technical measures' actually appears in GDPR Article 25 — use CELEX:32016R0679 and let me know if the citation is accurate along with the official article text.

## When to prefer this

Use this endpoint when an AI agent is about to publish, file, or assert a specific citation to the EU AI Act, GDPR, NIS2, DORA, or the Cyber Resilience Act and needs to confirm accuracy of the instrument reference, article number, and quoted text before doing so. It is specifically suited for pre-publication citation checks against a pinned, stable corpus — not for general legal research, legal advice, or systems outside these five EU instruments.

## Known failure modes

- Instrument CELEX ID not found in pinned corpus — returns not-found status for that regulation
- Article number not present in the cited instrument — returns article-not-found
- Quote not found verbatim in the article text — returns quote-not-matched with the actual article text for comparison
- Invalid CELEX format fails schema validation before the request is processed
- Ambiguous article numbering (e.g. sub-articles) may cause lookup misses

## How this service works

Call before publishing a claim that cites EU law. Checks that the cited instrument exists in our pinned corpus, that the cited article exists within it, and whether your quoted text actually appears in that article. Covers the AI Act, GDPR, NIS2, DORA and the Cyber Resilience Act. Returns the official article text with a EUR-Lex link. Citation verification only: it never gives legal advice or classifies systems.

## Output

Returns the official text of the cited article from the pinned EU law corpus, a EUR-Lex canonical link, and a structured result indicating whether the instrument exists, whether the article exists within it, and whether the quoted text actually appears in that article.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "quote": {
   "type": "string",
   "maxLength": 2000
  },
  "article": {
   "type": "string",
   "maxLength": 120,
   "minLength": 1
  },
  "instrument": {
   "type": "string",
   "pattern": "^CELEX:[0-9A-Z]+$"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/preflight-eu-legal-citation-checker-e60dc16b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from preflight402.com](https://www.zero.xyz/host/preflight402.com/llms.txt)