Starting this week, it’s possible to specify a list of ranges when querying isochrones. This will make it a lot easier to calculate arbitrary time or distance ranges, as it’s not bound anymore to fixed interval steps. Thus, the interval parameter is now redundant, but will still be supported going forward.
You can request isochrones on a car profile for 1, 3, 5 and 10 mins like this:
https://api.openrouteservice.org/isochrones?api_key=your-key&locations=8.34234%2C48.23424&profile=driving-car&range=60,180,300,600
Note, to avoid confusion, only use ascending sorting for range values, as the API will sort the response automatically.