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Cited Brief – Check Links
x402
Cited Brief – Check Links 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 2026-10-14).
Checks up to 10 public URLs for reachability, HTTP status, redirects, and content metadata
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
Returns a JSON object with a count of successful checks and an array of per-URL results, each including: whether the URL was reachable (ok), the HTTP status code, the final URL after any redirects, the page title, the content type, any redirect chain, the last-modified header if available, and a human-readable state label (e.g. 'ok', 'not_found').
Example use cases
Citation integrity check for research
“I just finished my report and want to make sure all 8 citation URLs are still live and returning 200. Can you check these links and flag any that are broken or returning an error: https://example.com/study1, https://example.com/study2, https://example.com/study3, https://example.com/study4, https://example.com/study5, https://example.com/study6, https://example.com/study7, https://example.com/study8?”
Detect dead links in published content
“We published a blog post last year with several outbound links — can you check whether https://partner.com/announcement, https://partner.com/whitepaper, and https://oldsite.com/press-release are still up, and tell me their current HTTP status and whether any of them redirect?”
Monitor competitor landing pages
“Can you verify these competitor pricing and product pages are still accessible and see if any of them have moved to a new URL? Here are the links: https://competitor-a.com/pricing, https://competitor-b.com/features, https://competitor-c.com/plans.”
Technical details
Endpoint
POSThttps://cited-brief.cited-brief.workers.dev/check-links?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need lightweight, fast HTTP-level reachability checks on a batch of up to 10 URLs — especially for citation validation, broken-link detection, or redirect auditing — and you want per-call pricing with no subscription. It is not a full page scraper; prefer it when you only need status codes, titles, redirects, and reachability rather than full page content or rendered JavaScript.
Side effects
- Non-public or firewall-protected URLs may return errors even if the page exists
- URLs that take longer than the worker timeout to respond may fail
- More than 10 URLs in a single request will be rejected by schema validation
- Malformed or non-HTTP(S) URLs will likely error or return unexpected states
- Payment failure via x402 will block the call before any URLs are checked
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| urls | array | Public http(s) URLs to check |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": 1,
"checked": 2,
"results": [
{
"ok": true,
"url": "https://example.com/pricing",
"state": "ok",
"title": "Pricing",
"status": 200,
"final_url": "https://example.com/pricing",
"redirects": [],
"content_type": "text/html",
"last_modified": null
},
{
"ok": false,
"url": "https://example.com/retired-page",
"state": "not_found",
"title": null,
"status": 404,
"final_url": "https://example.com/retired-page",
"redirects": [],
"content_type": "text/html",
"last_modified": null
}
]
}
}Tags
x402
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