openapi: 3.1.0
info:
  title: Utility Accounting Bills API
  description: UtilityAPI provides a REST API for collecting, standardizing, and sharing utility data including meters, bills, intervals, authorizations, and webhook events. Supports the Green Button standard for energy data sharing.
  version: '2'
  contact:
    name: UtilityAPI Support
    url: https://utilityapi.com/contact
  termsOfService: https://utilityapi.com/terms
servers:
- url: https://utilityapi.com/api/v2
  description: UtilityAPI Production Server
security:
- bearerAuth: []
tags:
- name: Bills
  description: Utility billing information
paths:
  /bills:
    get:
      operationId: listBills
      summary: List Bills
      description: List all utility bills for authorized meters.
      tags:
      - Bills
      parameters:
      - name: limit
        in: query
        required: false
        schema:
          type: integer
          default: 100
      - name: next
        in: query
        required: false
        schema:
          type: string
      - name: meter_uid
        in: query
        description: Filter bills by meter UID
        required: false
        schema:
          type: string
      - name: start
        in: query
        description: Start date filter (ISO 8601)
        required: false
        schema:
          type: string
          format: date
      - name: end
        in: query
        description: End date filter (ISO 8601)
        required: false
        schema:
          type: string
          format: date
      responses:
        '200':
          description: List of bills
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BillList'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    Error:
      type: object
      properties:
        errors:
          type: array
          items:
            type: string
        status:
          type: string
    Bill:
      type: object
      properties:
        uid:
          type: string
        meter_uid:
          type: string
        statement_date:
          type: string
          format: date
        due_date:
          type: string
          format: date
        total_kwh:
          type: number
        total_amount:
          type: number
        currency:
          type: string
          default: USD
        created:
          type: string
          format: date-time
    BillList:
      type: object
      properties:
        bills:
          type: array
          items:
            $ref: '#/components/schemas/Bill'
        next:
          type: string
  responses:
    Unauthorized:
      description: Missing or invalid authentication token
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: API token from the UtilityAPI dashboard
externalDocs:
  description: UtilityAPI Documentation
  url: https://utilityapi.com/docs