curl --request POST \
  --url https://api.uniblock.dev/uni/v1/json-rpc?chainId=starknet-sepolia \
  --header 'content-type: application/json' \
  --data '{
    "id": 1,
    "jsonrpc": "2.0",
    "method": "starknet_blockHashAndNumber",
    "params": []
  }'

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "block_hash": "0x1ba5d3910676f8383a1c472f1092a77cbe438b108face7873e0407ceee8da1e",
    "block_number": 4504
  }
}