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: 2025-10"
```
:::

:::code-group
```jsonc curl
// EXAMPLE RESPONSE 1: Serverless index (on-demand)
{
  "namespaces": {
    "example-namespace": {
      "vectorCount": 10000
    }
  },
  "indexFullness": 0,
  "totalVectorCount": 10000,
  "dimension": 1024,
  "metric": "cosine",
  "vectorType": "dense",
  "memoryFullness": 0,
  "storageFullness": 0
}

// EXAMPLE RESPONSE 2: Serverless index (dedicated read nodes)
{
  "namespaces": {
    "example-namespace": {
      "vectorCount": 705000
    }
  },
  "indexFullness": 0.01,
  "totalVectorCount": 705000,
  "dimension": 1536,
  "metric": "cosine",
  "vectorType": "dense",
  "memoryFullness": 0.01,
  "storageFullness": 0.01
}
```
:::

`POST /describe_index_stats`

#### 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` | `2025-10` | 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 indexes do not support filtering `describe_index_stats` by metadata.

#### 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. If a metadata filter expression is present, the summary will reflect only vectors matching that expression. |

| 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, regardless of whether a metadata filter expression was passed. The granularity of this metric is 10%. 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 |
| --- | --- | --- | --- |
| `memory_fullness?` | `number` | - | The amount of memory used by a dedicated index |

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

## Related pages

- [Account management](./account-management-index.md)
- [Admin](./admin-2-index.md)
- [Admin](./admin-index.md)
- [APIs](./apis-index.md)
- [Architecture](./architecture-index.md)
- [Bring Your Own Cloud](./bring-your-own-cloud-index.md)
- [Build an assistant](./build-an-assistant-index.md)
- [Build an integration](./build-an-integration-index.md)
- [Changelog](./changelog-index.md)
- [Changelog](../changelog.md)

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