getblockcount

// Request
curl -H "Content-Type: application/json" -d '{"id":1, "jsonrpc":"2.0", "method": "getblockcount","params": []}' http://<your-app-id>.ankr.com
​
// Result
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": 719270
}