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POST
getFirstAvailableBlock
curl --request POST \
  --url 'https://mainnet.helius-rpc.com/?api-key=' \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "id": "1",
  "method": "getFirstAvailableBlock"
}
'
{
  "jsonrpc": "2.0",
  "id": "1",
  "result": 250000
}

Authorizations

​
api-key
string
query
required

Your Helius API key. You can get one for free in the dashboard.

Body

application/json
​
jsonrpc
enum<string>
default:2.0

The JSON-RPC protocol version.

Available options:
2.0
Example:

"2.0"

​
id
string
default:1

A unique identifier for the request.

Example:

"1"

​
method
enum<string>
default:getFirstAvailableBlock

The name of the RPC method to invoke.

Available options:
getFirstAvailableBlock
Example:

"getFirstAvailableBlock"

Response

Successfully retrieved the slot of the lowest confirmed block.

​
jsonrpc
enum<string>

The JSON-RPC protocol version.

Available options:
2.0
Example:

"2.0"

​
id
string

Identifier matching the request.

Example:

"1"

​
result
integer

Earliest Solana block slot number still available in this node's storage history, indicating the lower boundary of accessible blockchain data.

Example:

250000