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 2026-09-15).

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

Seller volume →—

Success—

StatusUnknown

How this service works

Web reads and change checks: $0.005 on Base, $0.01 on Algorand; digital PDF-to-text $0.01. Structured JSON, hashes and x402 USDC. No API key.

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

POSThttps://api.agentwork.run/v1/web/changes

When 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
url	string	Public HTTP/HTTPS URL; ports 80/443 and public IPv4 resolution only
max_chars	integer	Maximum returned characters; keep identical between comparisons
previous_text	string	Exact text from the prior read, for line additions/removals
previous_sha256	string	Prior text_sha256; provides a compact change check without line diff

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"
  }
}

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How this service works

Web reads and change checks: $0.005 on Base, $0.01 on Algorand; digital PDF-to-text $0.01. Structured JSON, hashes and x402 USDC. No API key.

Output

Example use cases

SaaS pricing page tracker

Policy update monitoring for compliance

Documentation change alerting for developer agents

Technical details

Endpoint

POSThttps://api.agentwork.run/v1/web/changes

When to prefer

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
url	string	Public HTTP/HTTPS URL; ports 80/443 and public IPv4 resolution only
max_chars	integer	Maximum returned characters; keep identical between comparisons
previous_text	string	Exact text from the prior read, for line additions/removals
previous_sha256	string	Prior text_sha256; provides a compact change check without line diff

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"
  }
}