openapi: 3.0.3
info:
  title: ExchangeRate Account API
  description: 'ExchangeRate-API provides real-time and historical currency exchange rates for 165 currencies across 200 countries. Operating since 2010, the service delivers reliable currency conversion data via simple HTTP GET requests. Authentication is supported via API key embedded in the URL path or via Bearer token header. A free tier is available with 1,500 monthly requests and daily updates; paid plans offer hourly or 5-minute update frequencies and higher quotas. Historical data is available back to 1990.

    '
  version: '6'
  termsOfService: https://www.exchangerate-api.com/terms
  contact:
    name: ExchangeRate-API Support
    email: support@exchangerate-api.com
  x-api-id: exchangerate:exchangerate-api
  x-provider-name: ExchangeRate-API
servers:
- url: https://v6.exchangerate-api.com/v6
  description: ExchangeRate-API v6 endpoint (API key in URL path)
- url: https://v6.exchangerate-api.com/v6
  description: ExchangeRate-API v6 endpoint (Bearer token auth — omit key from path)
security:
- BearerAuth: []
tags:
- name: Account
  description: API quota and account information
paths:
  /{apiKey}/quota:
    get:
      operationId: getQuota
      summary: Get API request quota information
      description: 'Returns the remaining request quota for the current billing period along with plan details.

        '
      tags:
      - Account
      security:
      - {}
      parameters:
      - $ref: '#/components/parameters/apiKey'
      responses:
        '200':
          description: Successful response with quota information
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QuotaResponse'
              example:
                result: success
                documentation: https://www.exchangerate-api.com/docs
                terms_of_use: https://www.exchangerate-api.com/terms
                plan_quota: 1500
                requests_remaining: 1243
                refresh_day_of_month: 1
        '403':
          description: Authentication error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
components:
  parameters:
    apiKey:
      name: apiKey
      in: path
      required: true
      description: Your personal API key obtained from the ExchangeRate-API dashboard
      schema:
        type: string
        example: YOUR-API-KEY
  schemas:
    QuotaResponse:
      allOf:
      - $ref: '#/components/schemas/BaseMetadata'
      - type: object
        required:
        - result
        - plan_quota
        - requests_remaining
        - refresh_day_of_month
        properties:
          plan_quota:
            type: integer
            description: Total number of API requests allowed per billing period on your current plan
            example: 1500
          requests_remaining:
            type: integer
            description: Number of API requests remaining in the current billing period
            example: 1243
          refresh_day_of_month:
            type: integer
            description: Day of the month when the quota resets
            minimum: 1
            maximum: 31
            example: 1
    ErrorResponse:
      type: object
      required:
      - result
      - error-type
      properties:
        result:
          $ref: '#/components/schemas/ResultError'
        error-type:
          type: string
          description: Machine-readable error code
          enum:
          - unsupported-code
          - malformed-request
          - invalid-key
          - inactive-account
          - quota-reached
          example: invalid-key
    ResultError:
      type: string
      enum:
      - error
      description: Indicates the request failed
    BaseMetadata:
      type: object
      description: Common metadata fields returned in all successful responses
      properties:
        result:
          $ref: '#/components/schemas/ResultSuccess'
        documentation:
          type: string
          format: uri
          description: Link to the API documentation
          example: https://www.exchangerate-api.com/docs
        terms_of_use:
          type: string
          format: uri
          description: Link to the terms of use
          example: https://www.exchangerate-api.com/terms
    ResultSuccess:
      type: string
      enum:
      - success
      description: Indicates the request was successful
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: 'Pass API key as a Bearer token in the Authorization header (e.g. Authorization: Bearer YOUR-API-KEY). When using this method, omit the API key from the URL path. The path-key endpoints do not use a security scheme in the OpenAPI sense; the {apiKey} path parameter serves as the credential.

        '
externalDocs:
  description: ExchangeRate-API Documentation
  url: https://www.exchangerate-api.com/docs/overview