post
POST / HTTP/1.1
Host: mainnet.helius-rpc.com
Content-Type: application/json
Accept: */*
Content-Length: 93

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getTransactionCount",
  "params": [
    {
      "commitment": "finalized"
    }
  ]
}
{
  "jsonrpc": "2.0",
  "id": "1",
  "result": 268
}