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Change / Diff Check
x402
Change / Diff Check is a paid API for AI agents from mcp.dropenginehq.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Compares normalized public webpage text against a previously stored SHA-256 hash to detect whether the page content has changed.
Price / call$0.001
Success—
StatusUnknown
How this service works
Compare normalized public webpage text with a prior SHA-256 hash.
Output
Returns whether the current normalized text of the webpage matches, differs from, or cannot be compared to the provided SHA-256 hash — likely including a changed/unchanged status flag and potentially the new hash of the current page content.
Example use cases
Price page change detection
“Has https://competitor.com/pricing changed since yesterday? Here's the SHA-256 hash I stored from the last check: b4e2a1f9c3d8...”
Policy document update monitor
“Can you check if the terms of service at https://example.com/terms is still the same as it was when I hashed it — previous hash is 9c1d3e7f2a4b...”
Autonomous agent content integrity check
“Before I proceed, verify that https://docs.api.example.com/v2/reference hasn't been modified since we last fetched it — the hash from our last run was 7f3a2c8e1b9d...”
Technical details
Endpoint
POSThttps://mcp.dropenginehq.com/api/check-change?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need lightweight, hash-based change detection for a specific public webpage without storing full snapshots. Ideal for autonomous agents that need to cheaply verify whether a page has been modified since a prior crawl, rather than doing a full re-extract. Preferred over full-extract endpoints when you only need a yes/no change signal and already have a stored hash.
Side effects
- URL is unreachable or returns non-200 status
- URL points to a non-public or paywalled page
- previous_hash is malformed or wrong length
- webpage content cannot be normalized for comparison
- rate limiting or payment failure via x402 protocol
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | |
| previous_hash | string |
Tags
x402
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