# Cited Brief – Check Quote

> Cited Brief – Check Quote is a paid API for AI agents from cited-brief.cited-brief.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-17).

Verifies whether specific exact-text quotes appear on a given public web page, returning found/not-found status with surrounding context

## Facts

- Endpoint: POST https://cited-brief.cited-brief.workers.dev/check-quote?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cited-brief-check-quote-2ef7f53f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yQttDxtK6MweVtB-H-jih

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 cited-brief-check-quote-2ef7f53f -d '<json body>'
```

Example prompt: Can you verify that the sentence 'Pro costs $10 per user/month when billed annually' actually appears on https://example.com/pricing right now?

## When to prefer this

Use this endpoint when you need to programmatically confirm that a specific exact sentence or phrase is present on a live web page — for instance before citing a source, auditing a competitor claim, or verifying that expected content has not been removed. Prefer this over general web scraping when you already know the exact text you're looking for and want a structured true/false answer with context rather than raw HTML.

## Known failure modes

- Page is behind a login wall or paywall — quote cannot be verified, likely returns found:false
- URL redirects to an unexpected page — final_url will differ from input URL
- Quote has minor wording differences from actual page text — returns found:false even if semantically similar
- Network timeout or unreachable URL — returns an error response
- Quote string is fewer than 8 characters or longer than 1000 characters — rejected by input validation
- More than 10 quotes submitted in a single call — rejected by input validation

## How this service works

Pay-per-call web research tools for AI agents, paid in USDC over x402.

## Output

A JSON object with the original URL, a results array where each entry contains the quote, a boolean 'found' flag, and the surrounding context text where the quote was located. Also includes a top-level 'all_found' boolean and the 'final_url' after any redirects.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "description": "Public http(s) page to check"
  },
  "quotes": {
   "type": "array",
   "items": {
    "type": "string",
    "maxLength": 1000,
    "minLength": 8
   },
   "maxItems": 10,
   "minItems": 1,
   "description": "Exact sentences you expect on the page"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "url": "https://example.com/pricing",
  "results": [
   {
    "found": true,
    "quote": "Pro costs $10 per user/month when billed annually",
    "context": "pricing pro costs $10 per user/month when billed annually, or $12 monthly."
   }
  ],
  "all_found": true,
  "final_url": "https://example.com/pricing"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cited-brief-check-quote-2ef7f53f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cited-brief.cited-brief.workers.dev](https://www.zero.xyz/host/cited-brief.cited-brief.workers.dev/llms.txt)