Polling widget example

polling.json

{
  "y_axis": {
    "format": "currency",
    "unit": "USD"
  },
  "series": [
    {
      "name": "GBP -> USD",
      "data": [
        1.62529,
        1.56991,
        1.50420,
        1.52265,
        1.55356,
        1.51930,
        1.52148,
        1.51173,
        1.55170,
        1.61966,
        1.59255,
        1.63762
      ]
    }
  ]
}