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Planet Completes Acquisition of Sinergise; Set to Expand Planet’s Earth Data Platform

If you want to get float values out of the service, you will have to use 32-bit float image type (as uint8 and uint16 types only support integers). A custom script which will return NDVI values for Sentinel-2 data could be:

//VERSION=3
    function setup() {
      return{
        input: [{
          bands: ["B04", "B08"]
        }],
        output: {
          id: "default",
          bands: 1,
          sampleType: SampleType.FLOAT32
        }
      }
    }
    function evaluatePixel(sample) {
      let ndvi = (sample.B08 - sample.B04) / (sample.B08 + sample.B04)
      return [ ndvi ]
    }

You can either save this in Configuration utility or you can pass it as EVALSCRIPT parameter. For the latter the example of the call is: https://services.sentinel-hub.com/ogc/wms/<INSTANCE_ID>?service=WMS&request=GetMap&layers=MY_LAYER&format=image/tiff&maxcc=20&time=
2015-01-01%2F2017-12-05&height=512&width=512&srs=EPSG%3A3857&bbox=1817366.784508351,
5882593.696827164,1819812.7694134766,5885039.681732289&EVALSCRIPT=dmFyIG5kdmkgPSAoQjA4LUIwNCkvKEIwOCtCMDQpOw0KcmV0dXJuIFtuZHZpXTs=

We suggest to also check the FAQ about details of internal calculation.