x402-zadenworks URL Change Watcher

x402

x402-zadenworks URL Change Watcher is a paid API for AI agents from x402-zadenworks.zaden-gaming.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-01).

Checks whether a URL's content has changed since the last check, reporting true/false/null (first check) plus added/removed paragraphs when changed.

Price / call$0.01

Seller volume →—

Success—

StatusUnknown

How this service works

Fourteen pay-per-call web tools for AI agents, billed in USDC on Base with no account or API key. START WITH /audit -- one call returns a complete page health check (SEO + structured data + accessibility, optionally plus links and sitemap) with a single score and one worst-first findings list. The parts are also sold individually. SITE AUDIT: /seo (on-page SEO and meta tags), /links (broken links), /sitemap (robots.txt and XML sitemap crawlability), /structured (JSON-LD and social preview tags), /a11y (WCAG accessibility) -- each scored 0-100 with a prioritised issue list. READING: /read (clean markdown), /snap (screenshot, PDF or rendered HTML), /tables (every HTML table as structured JSON), /verify (does a claim actually appear on this page). MONITORING: /watch (has this page changed), /compare (what differs between two pages). Plus /rank (best x402 service for a task) and /batch (several operations behind one payment).

Output

Returns a 'changed' field that is true (content differs from last check), false (content unchanged), or null (first time this URL has been checked — no baseline yet). When changed is true, also returns arrays of added and removed paragraph strings showing exactly what text was added or removed between checks.

Example use cases

Track competitor pricing page updates

“Keep an eye on https://competitor.com/pricing — has it changed since the last check? If so, what was added or removed?”

Monitor news article for corrections

“Check if https://nytimes.com/2024/05/article.html has been updated since we last checked it — show me any paragraphs that were added or taken out.”

Detect documentation changes

“Has the content at https://docs.someapi.com/changelog changed since our last check? I want to know if anything new was added or if anything was removed.”

Technical details

Endpoint

POSThttps://x402-zadenworks.zaden-gaming.workers.dev/watch?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need lightweight, per-call change detection on a specific URL without setting up a dedicated monitoring service. It is ideal for agents that periodically poll a page and need to know both whether content changed and exactly which paragraphs were added or removed — not just a binary changed signal. Prefer it over full-page scraping endpoints when you already have a prior baseline and only need the diff. It is not a persistent subscription service; the caller is responsible for scheduling repeat checks.

Side effects

URL is unreachable or returns a non-200 status — endpoint may return an error or null changed value
First-time check always returns null for changed since no prior snapshot exists
Dynamic or JavaScript-heavy pages may produce false positives if client-side content varies each render
Rate limit or payment failure ($0.01 USDC per call) causes request rejection
Invalid or malformed URL input results in an error response

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "url": "https://example.com",
    "status": 200,
    "changed": null,
    "finalUrl": "https://example.com/",
    "checkedAt": "2026-08-07T00:00:00.000Z",
    "wordCount": 28,
    "addedParagraphs": [],
    "removedParagraphs": []
  }
}

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