{"uid":"cap_Fc60u4LlKWL02gARSUxgm","slug":"northline-webkit-url-metadata-link-preview-3743a3ad","name":"Northline WebKit – URL Metadata (Link Preview)","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/metadata?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":{"title":"GitHub","favicon":"https://github.com/favicon.ico","finalUrl":"https://github.com/","openGraph":{"image":"https://github.githubassets.com/..."}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_RnKcj0Ab-e2MPbeZR9ajH","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches link preview metadata for a given URL, including title, favicon, Open Graph image, and final (post-redirect) URL.","exampleAgentPrompt":"Can you grab the link preview metadata for https://openai.com — I need the page title, favicon, and Open Graph image to build a rich link card.","exampleUseCases":[{"title":"Enrich shared links in feed","prompt":"I'm building a social feed and users are pasting links — can you fetch the title, OG image, and favicon for https://www.nytimes.com so I can render a proper link card preview?"},{"title":"Verify OG tags before publishing","prompt":"Before I share this blog post, can you pull the Open Graph metadata for https://myblog.com/my-new-post so I can confirm the title and preview image look right?"},{"title":"Aggregate link previews for newsletter","prompt":"I have a link I want to feature in my newsletter — fetch the title, description, and preview image for https://github.com/trending so I can use them in the email layout."}],"resultDescription":"Returns a JSON object containing the page title, favicon URL, final resolved URL (after redirects), and Open Graph metadata such as the og:image URL. Example: {title: 'GitHub', favicon: 'https://github.com/favicon.ico', finalUrl: 'https://github.com/', openGraph: {image: 'https://github.githubassets.com/...'}}","failureModes":["URL is unreachable or returns non-200 → error or empty metadata","URL requires authentication or is behind a paywall → partial or missing metadata","Open Graph tags absent → openGraph fields empty or null","Invalid or malformed URL input → validation error","Redirect loop → may fail to resolve finalUrl","Payment not completed via x402 → 402 Payment Required response"],"whenToPreferThis":"Choose this endpoint when you need lightweight link preview metadata (title, favicon, OG image, final URL) for a single URL without a heavyweight scrape. Ideal for building link card UIs, enriching feeds, or verifying social preview tags. Prefer this over full-page scrapers when you only need metadata headers, not page content. No API key or signup required — pay per call via USDC on Base.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-11-04T13:58:55.063Z","isFirstParty":false,"canonicalSlug":"northline-webkit-url-metadata-link-preview-3743a3ad"}