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FreeTier Agent API — Link Checker
x402
FreeTier Agent API — Link Checker is a paid API for AI agents from freetier-agent-api.pages.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-18).
Checks one or more URLs for liveness, returning HTTP status codes and response times to identify broken links
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-call data API for AI agents: AI model prices and cost calculator, 4,259 MCP servers, email domain checks, text-to-JSON extraction, country/holiday/currency lookup, page and link checks, page-to-markdown, 2,230 verified APIs. x402, USDC on Base, no signup. Sources cited in every response.
Output
Returns a JSON object with a total count of checked URLs, a count of broken links, and a per-URL array containing the URL, a boolean ok flag, HTTP status code, and response latency in milliseconds.
Example use cases
Pre-publish link audit for newsletter
“Before I send out my weekly newsletter, can you check all these URLs to make sure none are broken: https://blog.example.com/post-1, https://docs.example.com/guide, https://partner.com/offer — flag any that are returning errors.”
Website broken link scan
“I need to verify these 10 links from my sitemap are all still live and returning 200s — here they are: https://mysite.com/about, https://mysite.com/pricing, https://mysite.com/blog, https://mysite.com/contact. Tell me response times too.”
Monitor third-party dependency URLs
“Can you check if these external API documentation URLs are still accessible: https://stripe.com/docs/api, https://openai.com/api, https://twilio.com/docs — I want to know which ones are up and how fast they respond.”
Technical details
Endpoint
GEThttps://freetier-agent-api.pages.dev/api/link-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, pay-per-call link health check for up to 20 URLs without setting up a monitoring service or signing up for an account. Especially useful for pre-publish checks, sitemap validation, or ad-hoc link audits inside an AI agent workflow. Prefer this over full-site crawlers when you have a specific list of URLs to check rather than a whole domain.
Side effects
- Invalid or non-absolute URL in input causes validation error
- More than 20 URLs submitted exceeds limit
- Network timeout for a slow or unreachable host may count as broken
- Private/localhost URLs may be unreachable from the checker's network
- Non-HTTP(S) URLs (e.g. ftp://) not supported
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"broken": 1,
"checked": 2,
"results": [
{
"ms": 120,
"ok": true,
"url": "https://example.com",
"status": 200
}
]
}
}Tags
x402
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