curl --request POST \
  --url https://devnet-as.magicblock.app/ \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getFirstAvailableBlock",
  "params": []
}
'

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": null,
  "error": null
}