Hello @tom.oddo and all,

The support case was closed, I am conveying the resolution:

Input expiries happening in less than a week are filtered out by the surface building algo.

However, it is possible to get any short term point on the surface by specifying in the request. here is an example:

{
  "universe": [
    {
      "surfaceTag": "SPX_short_term",
      "underlyingType": "Eti",
      "underlyingDefinition": {
        "instrumentCode": ".SPX@RIC"
      },
      "surfaceParameters": {
        "xAxis": "Tenor",
        "yAxis": "Moneyness"
      },
      "surfaceLayout": {
        "format": "Matrix",
        "xValues": [
          "1D",
          "3D",
          "1W",
          "1M",
          "3M",
          "5M",
          "6M",
          "1Y"
        ]
      }
    }
  ]
}

@tom.oddo

I reproduced the issue you described. It appears that minMaturity parameter has no effect when useWeeklyOptions is set to true.
I opened a support case on your behalf with Refinitiv Helpdesk for this issue. For your reference the case number is 09756077. Refinitiv Support will investigate the problem and will keep you informed on the progress.