curl --request GET \
  --url https://api.amberdata.com/blockchains/blocks/metrics/historical \
  --header 'x-api-key: <api-key>'

{
  "status": 200,
  "title": "OK",
  "description": "Successful request",
  "payload": {
    "records": [
      {
        "timestamp": "2021-08-10T00:00:00.000Z",
        "difficultyAverage": "7699414348610995.0000",
        "difficultyMaximum": "7699414348610995",
        "difficultyMinimum": "7699414348610995",
        "durationAverage": "41000.000000000000",
        "durationMaximum": "41000",
        "durationMinimum": "41000",
        "hashrateAverage": 187790593868561,
        "baseFeeAverage": "30258142234.00000000",
        "baseFeeMaximum": "30258142234",
        "baseFeeMinimum": "30258142234",
        "baseFeeTotal": "30258142234",
        "burntFeeAverage": "351805579933266838",
        "burntFeeMaximum": "351805579933266838",
        "burntFeeMinimum": "351805579933266838",
        "burntFeeTotal": "351805579933266838",
        "issuanceAverage": "2000000000000000000",
        "issuanceMaximum": "2000000000000000000",
        "issuanceMinimum": "2000000000000000000",
        "issuanceTotal": "2000000000000000000",
        "issuanceUnit": "wei",
        "sizeAverage": "42380.000000000000",
        "sizeMaximum": 42380,
        "sizeMinimum": 42380,
        "sizeTotal": "42380",
        "transactionFeeAverage": "8191431157883818.0000",
        "transactionFeeMaximum": "8191431157883818",
        "transactionFeeMinimum": "8191431157883818",
        "transactionFeeTotal": "8191431157883818",
        "transactionsAverage": "93.0000000000000000",
        "transactionsMaximum": 93,
        "transactionsMinimum": 93,
        "transactionsTotal": "93"
      }
    ],
    "totalRecords": 365
  }
}