# Perps at open-interest cap

> HyperCore private-preview documentation.

> For the complete documentation index, see [llms.txt](/docs/llms.txt).

<Callout intent="info">
  This API is in private preview. Target October 2026; timing is subject to change.
</Callout>


# Perps at open-interest cap

Returns perpetual markets currently at their open-interest cap.

<Note>

  **Available now.** This read is served at the interim endpoint today.

</Note>

## Request

`POST /{apiKey}/info`

| Parameter | Type | Required | Description |
| --- | --- | --- |
| `type` | string | Yes | Selects `perpsAtOpenInterestCap`. |

```json
{
  "type": "perpsAtOpenInterestCap"
}
```

## Response fields

| Field | Type | Description |
| --- | --- | --- |
| `[]` | array | Perpetual market symbols at the open-interest cap, for example `CANTO`. |

## Response example

```json
["CANTO", "FTM", "JELLY"]
```