# Claim Verifier by PDFExtractAPI

> Claim Verifier by PDFExtractAPI is a paid API for AI agents from claim-verifier.pdfextractapi.workers.dev, paid per call via x402, $0.04/call, status unknown (last checked 2026-09-14).

Verifies a single factual claim against live web search results and returns a verdict with supporting evidence.

## Facts

- Endpoint: POST https://claim-verifier.pdfextractapi.workers.dev/verify
- Price: $0.04/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/claim-verifier-by-pdfextractapi-661e4905
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7rQVTJJ2MhowxftIvOj0O

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 claim-verifier-by-pdfextractapi-661e4905 -d '<json body>'
```

Example prompt: Can you fact-check this claim for me: 'The Eiffel Tower is taller than the Empire State Building' — search the web and tell me if it's true or false?

## When to prefer this

Choose this endpoint when you need real-time, web-grounded fact verification for a single discrete claim. It is best suited for spot-checking specific assertions in articles, research, user-generated content, or automated pipelines where truth grounding against live sources matters. Prefer it over static knowledge-base lookups when recency and web evidence are important.

## Known failure modes

- Claim exceeds 500 characters — truncation or rejection error
- Ambiguous claim with no clear web evidence — returned as unverifiable
- Live web search returns no relevant results — inconclusive verdict
- Claim is too niche or recent for indexed web content — low-confidence result
- Malformed request body missing required 'claim' field — 400 validation error

## How this service works

Verify a single factual claim against live web search results.

## Output

Returns a structured verification result indicating whether the claim is supported, refuted, or unverifiable, along with evidence or citations drawn from live web search results.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "required": [
      "claim"
     ],
     "properties": {
      "claim": {
       "type": "string",
       "description": "One factual claim to verify, max 500 characters."
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/claim-verifier-by-pdfextractapi-661e4905/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from claim-verifier.pdfextractapi.workers.dev](https://www.zero.xyz/host/claim-verifier.pdfextractapi.workers.dev/llms.txt)