Web Page Change Monitor

x402

Web Page Change Monitor is a paid API for AI agents from agentsvc.io, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-10).

Polls a web page and returns only lines added or removed since the previous call, using a cursor to ensure no changes slip between polls.

Price / call$0.003

Seller volume →—

Success—

StatusUnknown

How this service works

86 APIs for AI agents: web scraping and crawling to Markdown, AI summaries, data extraction and cited answers, screenshots and PDF, PDF, OCR and document conversion, news, paper and developer search and more, paid per call with USDC on Base, Solana, Polygon or Arbitrum via x402. No account, no API key, free sample on every service.

Output

Returns a JSON object with the diff (added and removed lines since last call), a human-readable summary, a new cursor to pass on the next call, keyword match results, page metadata (title, word count, line count, HTTP status, content hash), and a boolean indicating whether anything changed.

Example use cases

Competitor pricing page tracker

“Watch https://competitor.com/pricing for me — use the cursor I give you each loop, and alert me whenever the keyword 'price' or 'plan' shows up in newly added lines.”

Job board new posting alerts

“Check https://jobs.example.com/engineering every 10 minutes and tell me exactly what lines were added or removed since the last check — use the cursor so nothing slips through.”

Government regulation notice monitoring

“Monitor https://regulations.gov/recent-notices and flag anything newly added that contains the word 'cybersecurity' — use JavaScript rendering since the page loads dynamically, and pass the cursor each call.”

Technical details

Endpoint

POSThttps://agentsvc.io/api/v1/proxy/page-watch?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need incremental change detection on a specific web page in a polling loop — the cursor mechanism guarantees no changes are missed between calls. It is better than a full-page scraper when you only care about what changed, not the full content. Prefer it over generic scraping endpoints for price pages, changelogs, job boards, status pages, or competitor sites where you need keyword alerting on newly appeared text.

Side effects

Invalid or unreachable URL returns an HTTP error status
Expired or malformed cursor may cause baseline reset
Pages with heavy bot-blocking may return incomplete or empty content
JavaScript-heavy pages not detected without render:true may return partial content
Truncated diffs when page changes exceed maximum diff size (truncated:true flag set)
Rate limiting or payment failure returns 402 or 429 error

Input

Schema · Request body

Field	Type	Description
url	string	Page to watch (http or https)
cursor	string	Cursor from your previous call; omit on the first call
ignore	array	Ignore lines containing any of these substrings
render	boolean	Render JavaScript before reading
keywords	array	Alert when one of these appears in newly added text (case-insensitive)

Output

Schema · Response

{
  "type": "json",
  "example": {
    "data": {
      "url": "https://www.python.org/downloads/",
      "diff": {
        "added": [
          "![Python release cycle](https://devguide.python.org/_static/release-cycle.svg)"
        ],
        "removed": [],
        "truncated": false,
        "added_count": 1,
        "removed_count": 0
      },
      "since": "2026-10-09T06:57:46.355Z",
      "title": "Download Python | Python.org",
      "cursor": "OiXuu1BiPRMC2YpW",
      "changed": true,
      "summary": "1 line(s) added, 0 removed since 2026-10-09T06:57:46.355Z. First new line: \"![Python release cycle](https://devguide.python.org/_static/release-cycle.svg)\"",
      "keywords": [
        {
          "keyword": "3.15",
          "present": true,
          "newly_appeared": false
        }
      ],
      "checked_at": "2026-10-09T06:57:46.512Z",
      "line_count": 346,
      "word_count": 3196,
      "cursor_help": "Pass this cursor on your next call. It only advances when a change is reported.",
      "first_check": false,
      "http_status": 200,
      "content_hash": "8eb1656e342b8803149a57e36e6885a9",
      "keyword_alert": false
    },
    "success": true
  }
}

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