How can I sub a secondBar chart

I found the md/getChart input only has MinuteBar,how can I get a SecondBar char,And is there has the example about the Custom ,and the Volume, Range, UnderlyingUnits, Renko, MomentumRange, PointAndFigure, OFARange in elementSizeUnit, for let me know the different detail.

I think Custom will be OK ,but I do not know what param will invalid.
I send

{
    "symbol": "MNQM2",
    "chartDescription": {
        "underlyingType": "Custom",
        "elementSize": 1,
        "elementSizeUnit": "UnderlyingUnits",
        "withHistogram": false
    },
    "timeRange": {
        "asMuchAsElements": 10
    }
}

back error:

{
    "violations": [
        {
            "constraint": "customUnderlying",
            "value": "None",
            "description": "Custom Underlying should be specified"
        }
    ]
}

I use chrome find in TR web client ,the sub second chart request is:

{
    "symbol": "2553027",
    "chartDescription": {
        "underlyingType": "Tick",
        "elementSizeUnit": "Seconds",
        "elementSize": 1,
        "withHistogram": false
    },
    "timeRange": {
        "asMuchAsElements": 300
    }
}

why underlyingType is ‘Tick’?
and the elementSizeUnit is ‘Seconds’ is not write in API doc:

Try this and tell me what it gives you:

//JSON for 30s bars
{
  "chartDescription": {
    "elementSize": 30, 
    "underlyingType": "Tick",
    "elementSizeUnit": "Seconds", 
    "withHistogram": true //or false, depends on what you want
  }
  "symbol": "MNQM2",
  "timeRange": { "asMuchAsElements": 300 }
}

thanks alex,I get the wright input param by use web TR client,copy form the consol log

1 Like

Although this work for me, how about getting data for regular bar data like underlying type?

"chartDescription": {
    "underlyingType": "MinuteBar",
    "elementSize": 5,
    "elementSizeUnit": "UnderlyingUnits" || 'Seconds' (where does seconds go)?
  },