{"uid":"cap_gAHmxWMo8_GvxEwJZZodY","slug":"northline-webkit-url-uptime-redirect-check-7f0fd8c5","name":"Northline WebKit – URL Uptime & Redirect Check","description":"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.","url":"https://northline-webkit.northline-c86.workers.dev/v1/url/check?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["url"],"properties":{"url":{"type":"string","minLength":3,"description":"Public http(s) URL (scheme optional)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"ok":true,"status":200,"finalUrl":"https://github.com/","redirects":1,"responseMs":180,"securityHeaders":{"grade":"A"}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_IsKDohMod6cWXeEFR1vMx","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Checks whether a public URL is reachable, follows its redirect chain, measures response time, and grades its security headers.","exampleAgentPrompt":"Can you check if https://github.com/ is actually up, how many redirects it goes through, and what security header grade it gets?","exampleUseCases":[{"title":"Broken link detection before publishing","prompt":"Before I publish this blog post, can you check if https://example.com/old-article is still live or redirects somewhere else?"},{"title":"Security posture check for a vendor site","prompt":"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?"},{"title":"Monitoring redirect chain integrity","prompt":"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?"}],"resultDescription":"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.).","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:30:22.609Z","isFirstParty":false,"canonicalSlug":"northline-webkit-url-uptime-redirect-check-7f0fd8c5"}