> For the complete documentation index, see [llms.txt](https://agpt.co/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://agpt.co/docs/integrations/block-integrations/fact_checker.md).

# Jina Fact Checker

Blocks for verifying statement factuality using Jina AI's Grounding API.

## Fact Checker

### What it is

This block checks the factuality of a given statement using Jina AI's Grounding API.

### How it works

This block uses Jina AI's Grounding API to verify the factuality of statements. It analyzes the statement against reliable sources and returns a factuality score, result, reasoning, and supporting references.

The API searches for evidence and determines whether the statement is supported, contradicted, or uncertain based on available information.

### Inputs

| Input     | Description                           | Type | Required |
| --------- | ------------------------------------- | ---- | -------- |
| statement | The statement to check for factuality | str  | Yes      |

### Outputs

| Output     | Description                                                  | Type             |
| ---------- | ------------------------------------------------------------ | ---------------- |
| error      | Error message if the operation failed                        | str              |
| factuality | The factuality score of the statement                        | float            |
| result     | The result of the factuality check                           | bool             |
| reason     | The reason for the factuality result                         | str              |
| references | List of references supporting or contradicting the statement | List\[Reference] |

### Possible use case

**Content Verification**: Verify claims in articles or social media posts before publishing.

**AI Output Validation**: Check factuality of AI-generated content to ensure accuracy.

**Research Support**: Validate statements in research or journalism with supporting references.

***


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