> ## 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

<ParamField query="x-token" type="string" required>
  Your Helius API key. You can get one in the
  [dashboard](https://dashboard.helius.dev/api-keys).
</ParamField>

## Message

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

<RequestExample>
  ```json Empty Request theme={"system"}
  {}
  ```
</RequestExample>

## Response

<ResponseField name="first_available" type="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.
</ResponseField>

<ResponseExample>
  ```json theme={"system"}
  {
    "firstAvailable": "448724150"
  }
  ```
</ResponseExample>

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.
</Note>

See [Historical Replay](/docs/laserstream/historical-replay) for replay configuration and recovery guidance.