> ## Documentation Index
> Fetch the complete documentation index at: https://docs.amberdata.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Blocks Metrics Historical

> Get metrics for historical confirmed blocks for a given blockchain.



## OpenAPI

````yaml get /blocks/metrics/historical
openapi: 3.1.0
info:
  title: blockchain-api
  version: '2'
servers:
  - url: https://api.amberdata.com/blockchains
security:
  - sec0: []
paths:
  /blocks/metrics/historical:
    get:
      summary: Blocks Metrics Historical
      description: Get metrics for historical confirmed blocks for a given blockchain.
      operationId: blocks-metrics-historical
      parameters:
        - name: startDate
          in: query
          description: '**[Optional]** Filter by data after this date.'
          schema:
            type: string
            format: date-time
        - name: endDate
          in: query
          description: '**[Optional]** Filter by data before this date.'
          schema:
            type: string
            format: date-time
        - name: timeFormat
          in: query
          description: >-
            **[Optional]** Time format of the timestamps in the return
            payload.<BR/>**[Defaults]** `milliseconds | ms* | iso | iso8601 | hr
            | human_readable`
          schema:
            type: string
            default: iso
        - name: x-amberdata-blockchain-id
          in: header
          description: The id of the blockchain
          schema:
            type: string
            enum:
              - bitcoin-mainnet
              - bitcoin-abc-mainnet
              - ethereum-mainnet
              - litecoin-mainnet
            default: ethereum-mainnet
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: object
                properties:
                  status:
                    type: integer
                    example: 200
                    default: 0
                  title:
                    type: string
                    example: OK
                  description:
                    type: string
                    example: Successful request
                  payload:
                    type: object
                    properties:
                      records:
                        type: array
                        items:
                          type: object
                          properties:
                            timestamp:
                              type: string
                              format: date-time
                              example: '2021-08-10T00:00:00.000Z'
                            difficultyAverage:
                              type: string
                              example: '7699414348610995.0000'
                            difficultyMaximum:
                              type: string
                              example: '7699414348610995'
                            difficultyMinimum:
                              type: string
                              example: '7699414348610995'
                            durationAverage:
                              type: string
                              example: '41000.000000000000'
                            durationMaximum:
                              type: string
                              example: '41000'
                            durationMinimum:
                              type: string
                              example: '41000'
                            hashrateAverage:
                              type: integer
                              example: 187790593868561
                            baseFeeAverage:
                              type: string
                              example: '30258142234.00000000'
                            baseFeeMaximum:
                              type: string
                              example: '30258142234'
                            baseFeeMinimum:
                              type: string
                              example: '30258142234'
                            baseFeeTotal:
                              type: string
                              example: '30258142234'
                            burntFeeAverage:
                              type: string
                              example: '351805579933266838'
                            burntFeeMaximum:
                              type: string
                              example: '351805579933266838'
                            burntFeeMinimum:
                              type: string
                              example: '351805579933266838'
                            burntFeeTotal:
                              type: string
                              example: '351805579933266838'
                            issuanceAverage:
                              type: string
                              example: '2000000000000000000'
                            issuanceMaximum:
                              type: string
                              example: '2000000000000000000'
                            issuanceMinimum:
                              type: string
                              example: '2000000000000000000'
                            issuanceTotal:
                              type: string
                              example: '2000000000000000000'
                            issuanceUnit:
                              type: string
                              example: wei
                            sizeAverage:
                              type: string
                              example: '42380.000000000000'
                            sizeMaximum:
                              type: integer
                              example: 42380
                            sizeMinimum:
                              type: integer
                              example: 42380
                            sizeTotal:
                              type: string
                              example: '42380'
                            transactionFeeAverage:
                              type: string
                              example: '8191431157883818.0000'
                            transactionFeeMaximum:
                              type: string
                              example: '8191431157883818'
                            transactionFeeMinimum:
                              type: string
                              example: '8191431157883818'
                            transactionFeeTotal:
                              type: string
                              example: '8191431157883818'
                            transactionsAverage:
                              type: string
                              example: '93.0000000000000000'
                            transactionsMaximum:
                              type: integer
                              example: 93
                            transactionsMinimum:
                              type: integer
                              example: 93
                            transactionsTotal:
                              type: string
                              example: '93'
                      totalRecords:
                        type: integer
                        example: 365
        '401':
          description: '401'
          content:
            text/plain:
              examples:
                Result:
                  value: Unauthorized
      deprecated: false
      security:
        - ApiKeyAuth: []
components:
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: x-api-key

````