fetchAtmIvIntraday method
override
Historical ATM Implied Volatility, sampled once per minute.
[
{ "time": 1721460600000, "atmIv": 21.8 },
...
]
Return "{}" when no historical data is available.
Implementation
@override
Future<String> fetchAtmIvIntraday() async {
final result = await _data.invokeMethod<String>('fetchAtmIvIntraday');
return result ?? '[]';
}