# Web Content Verification API

> Web Content Verification API is a paid API for AI agents from nfsbl-159-89-4-32.free.pinggy.net, paid per call via x402, $0.25/call, status unknown (last checked 2026-10-11).

Verifies whether a given URL's page content supports an optional claim, returning cross-references and support assessment

## Facts

- Endpoint: POST https://nfsbl-159-89-4-32.free.pinggy.net/verify?utm_source=zero.xyz
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/web-content-verification-api-bf36090b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MHFhsTy9_csFtDEHhX1Ec

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-content-verification-api-bf36090b -d '<json body>'
```

Example prompt: Can you verify whether this page https://example.com/article supports the claim that 'global temperatures rose 1.5 degrees in the last decade'?

## When to prefer this

Choose this endpoint when you need to programmatically verify whether a web page's content supports a specific claim or assertion, especially in fact-checking, research validation, or automated content corroboration workflows. It is particularly useful when you have a URL and a concrete statement you want to test against that URL's content, and you need structured output including cross-references.

## Known failure modes

- URL is unreachable or returns an error (network failure or bad URL)
- Page content is behind authentication or a paywall, preventing analysis
- Claim is ambiguous and results in an indeterminate 'supported' assessment
- Rate limiting or service unavailability at the pinggy.io-hosted endpoint
- Empty or malformed response if the page has no parseable text content

## How this service works

Website hosted for free through pinggy.io&gt;
    &lt;meta name=

## Output

Returns the original URL, a 'supported' string indicating whether the page content supports the provided claim, an array of cross-reference objects found on the page, and a receipt object confirming the paid transaction.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "url"
 ],
 "properties": {
  "url": {
   "type": "string"
  },
  "claim": {
   "type": "string",
   "description": "optional claim to test against page content"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "url"
 ],
 "properties": {
  "url": {
   "type": "string"
  },
  "receipt": {
   "type": "object"
  },
  "supported": {
   "type": "string"
  },
  "crossReferences": {
   "type": "array",
   "items": {
    "type": "object"
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/web-content-verification-api-bf36090b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from nfsbl-159-89-4-32.free.pinggy.net](https://www.zero.xyz/host/nfsbl-159-89-4-32.free.pinggy.net/llms.txt)