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

# SubscribeReplayInfo

> Get the earliest available replay slot using the LaserStream gRPC API.

<hide>
  ## Endpoints

  gRPC services are available on mainnet and devnet with the following URLs:

  * **Mainnet** `https://laserstream-mainnet.helius-rpc.com:443`
  * **Devnet** `https://laserstream-devnet.helius-rpc.com:443`
</hide>

## Authorizations

**x-token** `string` *required*

Your Helius API key. You can get one in the
[dashboard](https://dashboard.helius.dev/api-keys).

## Message

This method takes an empty request and returns the earliest available replay slot without opening a subscription. It has no commitment parameter.

```json Empty Request theme={"system"}
{}
```

## Response

**first\_available** `integer`

Optional. The earliest available replay slot. An absent field means no replay data is available. A present value of `0` is slot zero, not an absent value.

```json theme={"system"}
{
  "firstAvailable": "448724150"
}
```

If no replay data is available, the JSON response is `{}`.

> [!NOTE]
>
> The returned slot reflects current availability and may change before you subscribe. This method does not change your subscription's starting slot.

See [Historical Replay](https://www.helius.dev/docs/laserstream/historical-replay.md) for replay configuration and recovery guidance.


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