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Material Web Change Detection
x402
Material Web Change Detection is a paid API for AI agents from x402-gateway-production-1f21.up.railway.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-14).
Detects whether a webpage has changed by comparing its current content hash against a previously stored hash
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-payable x402 utilities for hashing, Base64, UUID generation, unit and timezone conversion, realtime crypto market data, webpage/document extraction, URL-to-Markdown, metadata, RAG ingestion and deterministic website change detection.
Output
Returns a JSON response indicating whether the webpage content has changed relative to the provided previous hash, along with the current content hash and optionally a diff or change summary, enabling deterministic website change detection.
Example use cases
E-commerce price page monitoring
“Has the pricing page at https://acmecorp.com/pricing changed since last week? My previous content hash is b1d3f5a7c9e2b4d6f8a0c2e4b6d8f0a2c4e6b8d0f2a4c6e8b0d2f4a6c8e0b2d4.”
Competitor product page tracking
“Check if https://competitor.io/features has been updated — I stored the hash 9f1a3c5e7b2d4f6a8c0e2b4d6f8a0c2e4b6d8f0a2c4e6b8d0f2a4c6e8b0d2f4 last time I crawled it.”
Regulatory content change alert
“I need to know if the terms page at https://finregulator.gov/rules/2024 has changed at all — compare it against my previous hash 4a6c8e0b2d4f6a8c0e2b4d6f8a0c2e4b6d8f0a2c4e6b8d0f2a4c6e8b0d2f4a6.”
Technical details
Endpoint
POSThttps://x402-gateway-production-1f21.up.railway.app/commerce/material-web-change?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need deterministic, hash-based detection of whether a specific webpage has changed, especially in automated pipelines that need to compare current state against a known prior snapshot. Ideal for AI agents monitoring competitor pages, regulatory content, pricing pages, or any URL where you have a stored previous hash. Prefer this over full-text scraping when you only need a changed/unchanged signal rather than the full page content.
Side effects
- Invalid or unreachable URL returns an error or timeout
- previous_hash too short (under 32 chars) or too long (over 128 chars) rejected by schema validation
- URL returns non-200 HTTP status causing fetch failure
- Malformed JSON body results in 400 error
- Transient network issues cause request failure
- Page blocks automated access (e.g. Cloudflare) causing extraction failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"status": "ready"
}
}Tags
x402
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