Serverless indexes scale automatically as needed, so index fullness is relevant only for pod-based indexes.

:::callout{intent="note"}
Index fullness is also relevant for [dedicated read nodes](/guides/index-data-dedicated-read-nodes-concepts#index-fullness). The response includes `memoryFullness` and `storageFullness` alongside `indexFullness`, which summarizes overall capacity usage. For serverless on-demand indexes, all three values are typically `0` because storage and compute scale automatically. For dedicated indexes, these values indicate when the index needs more capacity. See [Scale your index](/guides/index-data-dedicated-read-nodes-scale).
:::

:::code-group
```shell curl
# To get the unique host for an index,
# see https://docs.pinecone.io/guides/manage-data/target-an-index
PINECONE_API_KEY="YOUR_API_KEY"
INDEX_HOST="YOUR_INDEX_HOST"

curl -X POST "https://$INDEX_HOST/describe_index_stats" \
  -H "Api-Key: $PINECONE_API_KEY" \
  -H "X-Pinecone-Api-Version: 2026-07"
```
:::

`POST /describe_index_stats`

:::code-group
```json title="200"
{
  "dimension": 1024,
  "indexFullness": 0.4,
  "namespaces": {
    "": {
      "vectorCount": 50000
    },
    "example-namespace-2": {
      "vectorCount": 30000
    }
  },
  "totalVectorCount": 80000
}
```

```json title="400"
{
  "code": 123,
  "message": "<string>",
  "details": [
    {
      "typeUrl": "<string>",
      "value": "<string>"
    }
  ]
}
```

```json title="4XX"
{
  "code": 123,
  "message": "<string>",
  "details": [
    {
      "typeUrl": "<string>",
      "value": "<string>"
    }
  ]
}
```

```json title="5XX"
{
  "code": 123,
  "message": "<string>",
  "details": [
    {
      "typeUrl": "<string>",
      "value": "<string>"
    }
  ]
}
```
:::

#### Authorizations

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `Api-Key` | `string` | - |  |

An API Key is required to call Pinecone APIs. Get yours from the [console](https://app.pinecone.io/).

#### Headers

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `X-Pinecone-Api-Version` | `string` | `2026-07` | Required date-based version header |

#### Body

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `filter?` | `object` | - |  |

If this parameter is present, the operation only returns statistics for vectors that satisfy the filter. See [Understanding metadata](/guides/index-data-indexing-overview#metadata). Serverless and Starter indexes do not support filtering `describe_index_stats` by metadata, and reject a request carrying a non-empty filter.

#### Response

`200` — A successful response.

The response for the `describe_index_stats` operation.

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `namespaces?` | `object` | - | A mapping for each namespace in the index from the namespace name to a summary of its contents. |

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `dimension?` | `integer` | - | The dimension of the indexed vectors. Not specified if sparse index. Example: 1024 |

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `indexFullness?` | `number` | - | Example: 0.4 |

The fullness of the index, reported to a granularity of 1% and capped at `1.0`. Always `0` for indexes with on-demand read capacity. Serverless indexes scale automatically as needed, so index fullness is relevant only for pod-based indexes. The index fullness result may be inaccurate during pod resizing; to get the status of a pod resizing process, use [`describe_index`](/guides/database-control-plane-describe-index).

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `totalVectorCount?` | `integer` | - | The total number of vectors in the index, regardless of whether a metadata filter expression was passed Example: 80000 |

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `metric?` | `string` | - | The metric used to measure similarity. Example: cosine |

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `vectorType?` | `string` | - | The type of vectors stored in the index. Example: dense |

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `memoryFullness?` | `number` | - | The amount of memory used by a dedicated index |

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `storageFullness?` | `number` | - | The amount of storage used by a dedicated index |

## Related pages

- [List indexes](./database-control-plane-list-indexes.md)
- [Create an index](./database-control-plane-create-index.md)
- [Create an index with integrated embedding](./database-control-plane-create-for-model.md)
- [Describe an index](./database-control-plane-describe-index.md)
- [Delete an index](./database-control-plane-delete-index.md)
- [Configure an index](./database-control-plane-configure-index.md)

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