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

# Get Vector Count

Get the number of vectors stored in an encrypted index.

## Authentication

Required - API key via `X-API-Key` header:

```http theme={null}
X-API-Key: cyborg_your_api_key_here
```

Any valid credential is accepted — the root key or a per-user `cdbk_` token. When RBAC is not enabled (`CYBORGDB_SERVICE_ROOT_KEY` unset), no header is required.

## Request Body

```json theme={null}
{
  "index_name": "my_index",
  "index_key": "64_character_hex_string_representing_32_bytes"
}
```

<Expandable title="parameters">
  <ParamField body="index_name" type="string" required="true">
    Name of the index to count vectors for
  </ParamField>

  <ParamField body="index_key" type="string">
    32-byte encryption key as a hex string. Required for indexes created with the SDK-supplied KEK path; omit for KMS-backed indexes (the service resolves the key from the index's stored key envelope).
  </ParamField>
</Expandable>

## Response

```json theme={null}
{
  "result": 1500
}
```

<Expandable title="response fields">
  <ResponseField name="result" type="integer">
    Total number of vectors stored in the index
  </ResponseField>
</Expandable>

## Exceptions

<AccordionGroup>
  <Accordion title="401 Unauthorized">
    Authentication failed (invalid API key) **or** wrong `index_key` on SDK-supplied indexes — see [error model](../introduction#error-model-api-keys-index-keys-and-kms)
  </Accordion>

  <Accordion title="404 Not Found">
    Index not found
  </Accordion>

  <Accordion title="422 Unprocessable Entity">
    Invalid request parameters
  </Accordion>

  <Accordion title="500 Internal Server Error">
    Internal server error
  </Accordion>
</AccordionGroup>

## Example Usage

```bash theme={null}
# Get vector count
count=$(curl -s -X POST "http://localhost:8000/v1/vectors/num_vectors" \
     -H "X-API-Key: cyborg_your_api_key_here" \
     -H "Content-Type: application/json" \
     -d '{
       "index_name": "my_index",
       "index_key": "your_64_character_hex_key_here"
     }' | jq -r '.result')

echo "Index contains $count vectors"
```


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