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Webpage Change Detector / Content Diff Monitor
x402
Webpage Change Detector / Content Diff Monitor is a paid API for AI agents from x402-deployer.x402-deployer.workers.dev, paid per call via x402, $0.04/call, status unknown (last checked 2026-09-14).
Fetches a URL, strips HTML to plain text, hashes it with SHA-256, and returns a changed flag plus added/removed line diffs compared to a previous hash or text, with optional CSS selector scoping.
Price / call$0.04
Success—
StatusUnknown
How this service works
Webpage change detector / website change monitor / content diff / page-watch / visualping-style monitor / price-page monitor / status-page watcher / TOS-policy diff. Fetches a URL, strips HTML to plain text, computes a SHA-256 hash, and (when given a previous hash or text) returns a changed flag plus added/removed line lists. Optional CSS selector scopes the diff to one region. No login required; follows redirects.
Output
Returns a 'changed' boolean flag, the new SHA-256 hash of the page text, and lists of added and removed lines compared to the previous content. If no previous hash or text is provided, returns only the current hash and extracted text.
Example use cases
Example prompt
“Check if the pricing page at https://example.com/pricing has changed since last time — I have the previous hash abc123def456, and I only care about the #pricing-table section.”
Technical details
Endpoint
POSThttps://x402-deployer.x402-deployer.workers.dev/webpage-diffWhen to prefer
Choose this endpoint when you need to detect whether a specific webpage has changed over time, especially for price monitoring, status page watching, policy/TOS diffs, or any scenario where you have a previous hash or text snapshot and want a structured added/removed line diff. Prefer this over full scraping tools when you only need change detection, not full structured data extraction.
Side effects
- URL is unreachable or returns non-200 status — error response indicating fetch failure
- Invalid or malformed URL — validation error
- CSS selector matches no elements — diff performed on full page or empty scope returned
- Redirects loop infinitely — timeout or redirect error
- Page content is entirely JavaScript-rendered with no static HTML — returns empty or minimal text
Input
{
"input": {
"body": {
"url": "https://example.com",
"selector": "body"
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"url": "https://example.com",
"diff": null,
"changed": null,
"selector": "body",
"final_url": "https://example.com/",
"char_count": 127,
"status_code": 200,
"current_hash": "feb057ddba5ac313506909af05c17370808a81030f057346499d045c25534dbf",
"current_text": "Example Domain\nThis domain is for use in documentation examples without needing permission. Avoid use in operations.\nLearn more"
}Tags
x402
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