> ## Documentation Index
> Fetch the complete documentation index at: https://docs.factagora.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Fact Checker

> Best practices for Fact Checker

## Submit one claim at a time

The API verifies a single claim per request. For multiple claims, send them as separate requests.

```bash theme={null}
# Good, one specific claim
{"claim": "The global average temperature has risen by 1.1°C since pre-industrial times."}

# Avoid, multiple claims in one request
{"claim": "Temperature has risen 1.1°C and CO2 levels are at record highs."}
```

## Be specific and factual

Vague or opinionated statements produce lower confidence scores. Frame the claim as a concrete, verifiable statement.

```bash theme={null}
# Good, specific and verifiable
{"claim": "Apple became the first US company to reach a $3 trillion market cap in 2022."}

# Avoid, too vague
{"claim": "Apple is very successful."}
```

## Use confidence score as a filter

A `confidence` below `0.5` means the evidence is insufficient. Treat these as `UNCERTAIN` regardless of the verdict label.

```json theme={null}
{
  "verdict": "TRUE",
  "confidence": 0.3
}
```

A confidence of `0.3` above should be surfaced to users as `UNCERTAIN`, not `TRUE`.

## Expected response time

The endpoint performs a database search and an AI inference step. Expect **4–7 seconds** per request depending on the number of related items found.

## Combine with Evidence Finder

After receiving a verdict, use [Evidence Finder](/api-reference/evidence-finder) to surface broader supporting sources beyond what Factagora has indexed.

```
Fact Checker → verdict → Evidence Finder (for additional supporting sources)
```