agentutility(7)$ man webpage-diff
/webpage-diff
PRICE / CALL
$0.04
USDC · base mainnet · scheme: exact
METHOD
POST
CLUSTER
webprobeCATEGORY
utilities
STATUS
● live
NAME
webpage-diff — detects changes on a webpage: fetches a url, strips html to plain text, computes a sha-256 hash, and (when given a previous hash or text)…
SYNOPSIS
POST https://x402.agentutility.ai/webpage-diff
Content-Type: application/json
X-PAYMENT: <signed-transferWithAuthorization>
{ ... }↳ first call →
402 Payment Required. Sign USDCtransferWithAuthorization, retry with theX-PAYMENT header.DESCRIPTION
Detects changes on a webpage: 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. Use it as a website change monitor, content diff, page-watch, visualping-style monitor, price-page monitor, status-page watcher, or TOS-policy diff.
INPUT — request schema
| property | type | description | req? |
|---|---|---|---|
| url | string | Page URL to fetch (http or https). Server follows redirects and reports the final_url. | required |
| previous_hash | string | SHA-256 of a prior fetch, hex-encoded. If provided, response.changed compares against this hash. | optional |
| previous_text | string | Prior plain-text content from a previous fetch. If provided, response.diff returns added/removed line arrays. | optional |
| selector | string | Optional CSS selector to scope the diff (e.g. 'article', '#price'). When set, only matched element text is hashed and compared. | optional |
OUTPUT — response shape
| field | type | description |
|---|---|---|
| url | string | Original URL requested for monitoring. |
| final_url | string | URL after following redirects to the actual fetched page. |
| status_code | number | HTTP status code returned by the target server. |
| current_text | string | Cleaned plain-text extracted from the page HTML. |
| current_hash | string | SHA-256 hash of the cleaned text for fast change detection. |
| char_count | number | Length of the cleaned text in characters. |
| selector | string | CSS selector used to scope extraction, or empty if full page was used. |
| changed | boolean | True when the current hash differs from the previous hash passed in. |
| diff | object | Object with added and removed line arrays comparing current text to previous text. |
EXAMPLES — two ways to call
EXAMPLE 1 · curl
curl -X POST https://x402.agentutility.ai/webpage-diff \
-H 'Content-Type: application/json' \
-d '{ }'first response =
402 Payment Required with payment requirements; sign + retry with X-PAYMENT.EXAMPLE 2 · mcp
# Install the MCP package for this endpoint's cluster npx -y @agentutility/mcp-<cluster> # Required: EVM private key with USDC on Base export X402_PRIVATE_KEY=0x... # Then call the webpage-diff tool from your MCP-aware agent.
MCP server handles payment automatically — your coding agent just calls the tool by name.
METADATA
- tags
- diffmonitorchange-detectionscrapehtml
- methods
- POST
- cluster
- webprobe
- price
- $0.04 USDC per call
ADJACENT — other endpoints in webprobe
| endpoint | description | price |
|---|---|---|
| answer-web | Answers natural-language questions with live web research, returning a synthesized answer with inline [N] citations and the source URLs. | $0.04 |
| arxiv-summarize | arXiv paper summarizer / research-paper TLDR. | $0.04 |
| rss-from-anything | RSS feed generator / HTML to RSS converter. | $0.04 |
| scrape | Scrape any webpage. | $0.04 |
| scrape-website | Scrapes any webpage and pulls title, description, canonical URL, OpenGraph + Twitter card metadata, headings, and outbound links from a s… | $0.04 |
| screenshot | Website screenshot / URL to PNG/JPG. | $0.04 |
| website-screenshot | Captures a website screenshot from a URL as PNG or JPG. | $0.04 |
| arxiv-search | arXiv full-text search. | $0.03 |
SEE ALSO