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AgentWork Web Evidence - Change Detection
x402
AgentWork Web Evidence - Change Detection is a paid API for AI agents from api.agentwork.run, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-29).
Checks whether a public webpage has changed since a previous read, returning either a compact changed/unchanged flag or a line-level diff of added and removed content.
Price / call$0.005
Success—
StatusUnknown
How this service works
Website change monitoring / webpage change detection — text_sha256 or previous_text diff for documentation, pricing-page, changelog and policy monitoring. Batch up to 10 URLs in one call (items[]); optional CSS selector scoping and a one-line diff summary. $0.005 per URL Base ($0.01 Algorand); batch of 2-10 $0.003/URL ($0.006). Caller stores baseline; no server watch list. HTML/text only; no JS render. Failed checks not settled.
Output
Returns a JSON object with ok status, the current page URL, extracted plain text (up to max_chars), a fetch timestamp, and a comparison object containing a boolean 'changed' flag plus arrays of 'added' and 'removed' lines (populated only when previous_text was supplied). When only a SHA-256 hash is provided, the comparison includes 'changed' but no line diff.
Example use cases
SaaS pricing page tracker
“Check if the pricing page at https://stripe.com/pricing has changed since my last check — I have the SHA-256 hash from yesterday's read: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855. Just let me know if it changed.”
Policy update monitoring for compliance
“I need to know what specifically changed on https://openai.com/policies/usage-policies since last week. Here's the full text from my previous read so you can show me exactly which lines were added or removed.”
Documentation change alerting for developer agents
“Has the content at https://docs.anthropic.com/en/api/getting-started changed since I last fetched it? Use this SHA-256 to do a quick changed/unchanged check: a948904f2f0f479b8f936099f6e4b4d94a3d9ee3c8a4e2e5e9c8b7f6d5c4b3a2.”
Technical details
Endpoint
GEThttps://api.agentwork.run/v1/web/changes?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, stateless change-detection check for a specific public webpage without storing history server-side — ideal for recurring monitoring loops where the caller maintains the baseline (SHA-256 or prior text). Prefer the SHA-256 mode for bandwidth efficiency when you only need a changed/unchanged signal, and the previous_text mode when you need a precise line-level diff. This is better than a full page-fetch endpoint when the primary goal is detecting modifications rather than ingesting new content.
Side effects
- Non-public or private URLs return an error — only publicly accessible HTTP/HTTPS pages on ports 80/443 are supported
- JavaScript-rendered content will not be captured — only static HTML/text is fetched
- URLs resolving to non-public IPv4 addresses (e.g. internal IPs) are rejected
- If max_chars differs between calls, comparisons may be unreliable — callers must keep this value consistent
- Malformed or incorrect previous_sha256 (not a valid 64-character hex string) will be rejected
- Payment failure over x402 protocol results in the check not being performed
- Pages exceeding 60,000 characters after truncation may produce incomplete diffs
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"url": "https://example.com/",
"text": "Example Domain\nNew line",
"comparison": {
"added": [
"New line"
],
"changed": true,
"removed": [
"Old line"
]
},
"fetched_at": "2026-09-08T00:00:00Z"
}
}Tags
x402
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