Get reward of candidate

Example response

{
  "items": [
    {
      "_id": "5c19847f0e77307940be9216",
      "epoch": 3193,
      "startBlock": 2872801,
      "endBlock": 2873700,
      "address": "0x11621900588eca4410c00097a9f59237f34064cd",
      "validator": "0x11621900588eca4410c00097a9f59237f34064cd",
      "reason": "Voter",
      "lockBalance": "1000",
      "reward": "8.03540381764608993247",
      "rewardTime": "2018-12-18T23:36:18.000Z",
      "signNumber": 843,
      "__v": 0,
      "createdAt": "2018-12-18T23:36:31.435Z",
      "updatedAt": "2018-12-18T23:36:31.435Z"
    }
  ],
  "total": 100
}