# Keepalive user data stream (USER_STREAM)

## API Description

Extends the listenKey by 60 minutes from the moment of the call.

## HTTP Request

```http
PUT /v1/listenKey
```

## Request Weight

1

## Request Parameters

| Name | Type | Mandatory | Description |
| - | - | - | - |
| `listenKey` | STRING | NO | The key to extend. Optional — the key's active listenKey is extended when omitted. Sending a listenKey that is not the key's active one — or calling this when the key has no active listenKey at all — is `-1125`. |

## Response Example

```json
{}
```

**Send a keepalive every 30 minutes.** Half the lifetime gives you one free retry before expiry.
Base the schedule on a timer, not on stream activity — a quiet account produces no events, and an
open WebSocket connection does **not** extend the key on its own.

If the key does lapse, the stream sends a [`listenKeyExpired`](/user-data-streams/listenkeyexpired.md)
event and then closes the connection. Recover by calling `POST /v1/listenKey` again, reconnecting,
and **resnapshotting** with `GET /v1/positions` and `GET /v1/openOrders` — events during the gap are
not replayed.