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Northline WebKit – URL Uptime & Redirect Check
x402
Northline WebKit – URL Uptime & Redirect Check is a paid API for AI agents from northline-webkit.northline-c86.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).
Checks whether a public URL is reachable, follows its redirect chain, measures response time, and grades its security headers.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-call web and domain utilities for AI agents: URL to Markdown, link preview metadata, links, uptime/redirect check, DNS, email-domain check, WHOIS/RDAP, robots.txt and a one-call domain report. x402 (USDC on Base), no API key, no signup.
Output
A JSON object with: ok (boolean reachability), status (HTTP status code of final response), finalUrl (URL after following all redirects), redirects (count of redirects followed), responseMs (end-to-end latency in milliseconds), and securityHeaders.grade (letter grade reflecting presence of security headers like HSTS, CSP, etc.).
Example use cases
Broken link detection before publishing
“Before I publish this blog post, can you check if https://example.com/old-article is still live or redirects somewhere else?”
Security posture check for a vendor site
“I need to know if our vendor's site at https://vendor-portal.com has decent security headers — can you run an uptime and security check on it?”
Monitoring redirect chain integrity
“Our marketing team set up a redirect at https://go.ourcompany.com/promo — can you verify it resolves correctly and tell me the final URL and how many hops it takes?”
Technical details
Endpoint
GEThttps://northline-webkit.northline-c86.workers.dev/v1/url/check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, single-call check on whether a URL is live, what its final destination is after redirects, how fast it responds, and whether its security headers are up to standard. Prefer this over full page-scraping endpoints when you only need reachability/metadata, not page content. Ideal for broken-link detection, redirect-chain auditing, uptime spot-checks, and lightweight security posture reviews — all without needing an API key or subscription.
Side effects
- URL is unreachable or times out — ok: false returned
- Invalid or malformed URL input — validation error
- Private/internal URLs not accessible from the public internet — connection refused
- Rate limiting or firewall blocks the check — may return non-200 status
- Payment not settled via x402 — request rejected before execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"status": 200,
"finalUrl": "https://github.com/",
"redirects": 1,
"responseMs": 180,
"securityHeaders": {
"grade": "A"
}
}
}Tags
x402
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