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

# Refute a belief (set confidence to zero)

> **Required scope:** write

**Required scope:** `write`

### Path parameters

<ParamField path="proposition" type="string" required>
  The proposition to refute
</ParamField>

### Response

`ModifyBeliefResponse`

<ResponseField name="change" type="number (float)" required />

<ResponseField name="new_confidence" type="number (float)" required />

<ResponseField name="previous_confidence" type="number (float)" required />

<ResponseField name="proposition" type="string" required />

### Status codes

| Code  | Meaning                                            |
| ----- | -------------------------------------------------- |
| `200` | Belief refuted                                     |
| `401` | Unauthorized — missing or invalid credentials      |
| `403` | Forbidden — the key/token lacks the required scope |
| `429` | Rate limited — see Retry-After / X-RateLimit-Reset |

<RequestExample>
  ```bash cURL theme={null}
  curl --request POST \
    --url 'https://api.nsr.stateset.com/api/v1/beliefs/refute/{proposition}' \
    --header 'X-API-Key: YOUR_API_KEY'
  ```
</RequestExample>

<ResponseExample>
  ```json 200 theme={null}
  {
    "change": 1.5,
    "new_confidence": 7.5,
    "previous_confidence": 7.5,
    "proposition": "string"
  }
  ```
</ResponseExample>