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Cited Brief – Check Quote
x402
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
Price / call$0.01
Success—
StatusUnknown
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.
Example use cases
Pricing claim fact-check
“Check whether the page at https://acme.com/pricing still says 'Starter plan is free forever' and 'Pro plan is $29 per month' — I need to know if both quotes are actually there.”
Legal disclaimer presence check
“I need you to confirm that the text 'This is not financial advice' and 'Past performance is not indicative of future results' both appear on https://funds.example.com/disclaimer before we reference that page in our report.”
Competitor claim verification
“Can you check whether https://competitor.io/features still says 'unlimited storage included' and 'no credit card required' — I want to know if those claims are still live on their site.”
Technical details
Endpoint
POSThttps://cited-brief.cited-brief.workers.dev/check-quote?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Public http(s) page to check |
| quotes | array | Exact sentences you expect on the page |
Output
Schema · Response
{
"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"
}
}Tags
x402
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