# Web Evidence Capture & Change Detection

> Web Evidence Capture & Change Detection is a paid API for AI agents from epnkd-159-89-4-32.run.pinggy-free.link, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-24).

Captures a cryptographic evidence snapshot of a URL, returning its SHA-256 content hash, HTTP status, title, links, and change-detection metadata

## Facts

- Endpoint: POST https://epnkd-159-89-4-32.run.pinggy-free.link/evidence?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/web-evidence-capture-change-detection-c9f6e0ea
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SB2hrU86kF_huW30k7AZi

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability web-evidence-capture-change-detection-c9f6e0ea -d '<json body>'
```

Example prompt: Capture an evidence snapshot of https://example.com/terms and give me the SHA-256 hash, HTTP status, and page title so I have a verifiable record of what it said today.

## When to prefer this

Choose this endpoint when you need a cryptographic, tamper-evident record of a webpage's content at a specific point in time — particularly for legal evidence, compliance audits, or change-detection workflows. It is especially useful when you need both a SHA-256 content hash and structured metadata (title, status, links) in a single call, and when you want a payment receipt as proof of the capture event.

## Known failure modes

- URL is unreachable or times out — endpoint may return an error or non-200 HTTP status
- Invalid or malformed URL input — request will fail schema validation
- Target page returns a non-HTML response (e.g. binary file) — title and links may be empty or null
- Pinggy tunnel is offline or rate-limited — the endpoint itself may be unavailable
- HTTPS certificate errors on the target URL — capture may fail or return partial data

## How this service works

Website hosted for free through pinggy.io&gt;
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## Output

Returns a JSON object containing the requested URL, the final resolved URL (after redirects), HTTP status code, page title, content size in bytes, a SHA-256 hash of the page content, a sample of links found on the page, a change-detection sub-object for comparing against prior captures, and a payment receipt.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "url"
 ],
 "properties": {
  "url": {
   "type": "string",
   "description": "http(s) URL to capture evidence for"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "url",
  "contentSha256"
 ],
 "properties": {
  "url": {
   "type": "string"
  },
  "bytes": {
   "type": "integer"
  },
  "title": {
   "type": "string"
  },
  "receipt": {
   "type": "object"
  },
  "finalUrl": {
   "type": "string"
  },
  "httpStatus": {
   "type": "integer"
  },
  "linksSample": {
   "type": "array",
   "items": {
    "type": "string"
   }
  },
  "contentSha256": {
   "type": "string"
  },
  "changeDetection": {
   "type": "object"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/web-evidence-capture-change-detection-c9f6e0ea/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from epnkd-159-89-4-32.run.pinggy-free.link](https://www.zero.xyz/host/epnkd-159-89-4-32.run.pinggy-free.link/llms.txt)