# Web Evidence Capture & Change Detection

> Web Evidence Capture & Change Detection is a paid API for AI agents from cofnr-37-255-229-96.free.pinggy.net, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-20).

Captures a cryptographic snapshot of a web page at a given URL, returning its content hash, HTTP status, title, links, and change detection data as verifiable evidence.

## Facts

- Endpoint: POST https://cofnr-37-255-229-96.free.pinggy.net/evidence?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/web-evidence-capture-change-detection-12987a0b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_P_KGrieXhuNugjmEx_Sgp

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-12987a0b -d '<json body>'
```

Example prompt: Capture evidence of https://example.com/terms-of-service right now — I need the content hash, HTTP status, page title, and any detected changes so I have a verifiable snapshot for my records.

## When to prefer this

Choose this endpoint when you need a verifiable, cryptographically-hashed snapshot of a web page for evidence, audit, or change detection purposes — especially when SHA-256 content integrity and an on-chain-style receipt are required. It is preferable over simple scrapers when tamper-proof provenance of content at a specific moment matters.

## Known failure modes

- URL is unreachable or returns a non-2xx status — httpStatus will reflect the error code
- Invalid or malformed URL input — request rejected with validation error
- Target site blocks automated requests (403/captcha) — partial or failed capture
- Redirect loop detected — finalUrl may differ significantly or call may time out
- Tunnel host (pinggy.io) downtime — endpoint itself unavailable

## How this service works

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

Returns the original URL, final redirect URL, HTTP status code, page title, content size in bytes, a SHA-256 hash of the page content for cryptographic verification, a sample of links found on the page, a change detection object comparing to 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-12987a0b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cofnr-37-255-229-96.free.pinggy.net](https://www.zero.xyz/host/cofnr-37-255-229-96.free.pinggy.net/llms.txt)