# Anonymous Fetch-and-Report Witness

> Anonymous Fetch-and-Report Witness is a paid API for AI agents from pyfile-agent.taile3ff35.ts.net, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

Fetches a URL anonymously (no cookies, auth, or referer) and reports whether expected substrings are present or absent, serving as an independent blind-spot-aware witness for content verification.

## Facts

- Endpoint: GET https://pyfile-agent.taile3ff35.ts.net/data/witness
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/anonymous-fetch-and-report-witness-9eb7ce0f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CH2tRTFSdo72bl5hxc6VJ

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 anonymous-fetch-and-report-witness-9eb7ce0f
```

Example prompt: Anonymously fetch https://example.com/announcement and check whether the word 'launched' is present and that 'draft' is absent — report back what an anonymous reader would actually see.

## When to prefer this

Choose this endpoint when you need an independent, anonymous, credential-free witness to verify whether a public URL contains or lacks specific substrings — especially when you want a declared blind-spot-aware report rather than a scrape with your own session. It is ideal for deployment checks, content auditing, and privacy-neutral validation where the reader identity and vantage must be transparent and unbiased.

## Known failure modes

- Target URL is unreachable or returns an HTTP error — fetch failure reported
- Expected substring not found even though it exists (blind spot: single-host vantage, not multi-region)
- Page requires authentication or JS rendering that anonymous plain fetch cannot handle
- URL is malformed or missing — request rejected
- Rate limiting or network timeout on the target host

## How this service works

Independent anonymous fetch-and-report witness: target + negative control from the same run, declared blind_spot, reader identity (anonymous, no cookies/auth/referer) and vantage (single host; not a second region). ?url=https://...&expect=<substring>&expect_absent=<substring>

## Output

Returns a report indicating whether the expected substring was found and whether the expected-absent substring is indeed absent, along with declared reader identity (anonymous, no cookies/auth/referer), vantage information (single host), and any declared blind spots — giving a trustworthy, impartial witness account of what a public anonymous fetch returns.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   }
  },
  "output": {
   "type": "object"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/anonymous-fetch-and-report-witness-9eb7ce0f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pyfile-agent.taile3ff35.ts.net](https://www.zero.xyz/host/pyfile-agent.taile3ff35.ts.net/llms.txt)