openapi: 3.1.0
info:
  title: AspenTech Inmation Web Data Historical API
  description: The AspenTech Inmation Web API provides HTTP and WebSocket interfaces for external applications to interact with the AspenTech Inmation industrial IoT and time-series data platform. RPC-based REST APIs enable access to process data, system services, and automation functions for manufacturing and energy operations.
  version: 1.108.0
  contact:
    name: AspenTech Support
    url: https://atdocs.inmation.com/api/1.108/webapi/index.html
servers:
- url: http://{hostname}:8002
  description: Inmation Web API server
  variables:
    hostname:
      default: localhost
      description: Inmation server hostname or IP address
security:
- basicAuth: []
- bearerToken: []
tags:
- name: Historical
  description: Historical time-series data access
paths:
  /api/data/readhistory:
    post:
      operationId: readHistoricalData
      summary: Read historical time-series data
      description: Retrieve historical time-series data for one or more process items within a specified time range. Supports raw, interpolated, and aggregated retrieval modes.
      tags:
      - Historical
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - paths
              - startTime
              - endTime
              properties:
                paths:
                  type: array
                  items:
                    type: string
                startTime:
                  type: string
                  format: date-time
                  description: Start of historical range (ISO 8601)
                endTime:
                  type: string
                  format: date-time
                  description: End of historical range (ISO 8601)
                retrievalMode:
                  type: string
                  enum:
                  - Raw
                  - Interpolated
                  - Average
                  - Minimum
                  - Maximum
                  - Count
                  default: Raw
                numberOfIntervals:
                  type: integer
                  description: Number of intervals for aggregated retrieval
      responses:
        '200':
          description: Historical data values
          content:
            application/json:
              schema:
                type: object
                properties:
                  result:
                    type: array
                    items:
                      $ref: '#/components/schemas/HistoricalDataResult'
components:
  schemas:
    HistoricalDataResult:
      type: object
      properties:
        path:
          type: string
        values:
          type: array
          items:
            type: object
            properties:
              value:
                description: Historical value
              quality:
                type: integer
              timestamp:
                type: string
                format: date-time
  securitySchemes:
    basicAuth:
      type: http
      scheme: basic
    bearerToken:
      type: http
      scheme: bearer