# Facts Check API

Webz.io Facts Check uses AI to identify factual claims in online text, then cross-checks them against sources on the web. Each claim is marked `true`, `false`, or `unverified` when no references are found.

Try it in the [Playground](https://app.webz.io/playground).

## Requests

Use either of the following request forms:

| Parameter | Description | Request |
| --- | --- | --- |
| uuid | UUID of an existing post. | GET |
| post_text | Text to analyze; include the post title and text. | POST |
| post_link | Link to the post. | POST |
| date | Post publication date. | POST |
| token | Your Webz.io token. | GET or POST |

```http
GET https://api.webz.io/fact-check?token=[USER_TOKEN]&uuid=[POST_UUID]

```

```http
POST https://api.webz.io/fact-check?token=[USER_TOKEN]&post_text=[POST_TITLE+POST_TEXT]&post_link=[POST_LINK]&date=[POST_PUBLISHED_DATE]

```

\`post\_text\` must contain between 100 and 10,000 characters.

## Response

| Field | Description |
| --- | --- |
| bias | Detected political bias of the site. |
| claims[].claim | Claim extracted from the submitted post. |
| claims[].verified | Verification result: true, false, or unverified. |
| claims[].references | Sources used to verify the claim. |
| claims[].references[].text | Supporting source text. |
| claims[].references[].link | Supporting source link. |

```json
{
  "bias": "left",
  "claims": [
    {
      "claim": "Iran's Supreme Leader Ayatollah Ali Khamenei has...",
      "verified": "true",
      "references": [
        {
          "text": "Iran leader Khamenei sees his inner circle hollowed out...",
          "link": "https://www.reuters.com/world/middle-east/"
        }
      ]
    }
  ]
}

```

## Errors and credits

| Status | Meaning |
| --- | --- |
| 204 | No relevant facts were found. |
| 400 | The request is invalid, including an invalid UUID or invalid text input. |
| 401 | The token is missing or incorrect. |
| 402 | There are not enough API calls available. |

For Fact Check API usage, Pay-as-you-go users are charged $0.15 per API call, while subscription users are charged the equivalent of 5 API calls from their purchased API call package for each Fact Check API call.