curl --request POST \
  --url https://rpc.quai.network/cyprus1/ \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "method": "quai_blockNumber",
  "params": [],
  "id": 1
}
'

{
  "jsonrpc": "2.0",
  "result": "0x10d4f",
  "id": 1
}