Open Exchange Rates Convert API

openapi: 3.2.0
info:
  title: Open Exchange Rates Convert API
  description: RESTful JSON API delivering live and historical foreign exchange rates for 200+ world and digital currencies. Supports latest rates, historical end-of-day rates, time-series queries, currency conversion, and OHLC data depending on subscription plan. Trusted by over 100,000 organizations globally since 2011, with historical coverage back to January 1, 1999.
  version: '0.7'
  termsOfService: https://openexchangerates.org/terms
  contact:
    name: Open Exchange Rates Support
    url: https://support.openexchangerates.org
    email: support@openexchangerates.org
  license:
    name: Proprietary
    url: https://openexchangerates.org/terms
servers:
- url: https://openexchangerates.org/api
  description: Production API server
security:
- appId: []
tags:
- name: Convert
  description: Currency conversion (Unlimited plan)
paths:
  /convert/{value}/{from}/{to}:
    get:
      operationId: convertCurrency
      summary: Convert a currency amount
      description: Converts a monetary amount between two currencies using the latest available exchange rate. Uses a REST-based approach with an alternate response format. Available to Unlimited plan subscribers only.
      tags:
      - Convert
      parameters:
      - name: value
        in: path
        required: true
        description: The monetary amount to convert
        schema:
          type: number
          example: 100
      - name: from
        in: path
        required: true
        description: Source currency 3-letter ISO code
        schema:
          type: string
          example: USD
      - name: to
        in: path
        required: true
        description: Target currency 3-letter ISO code
        schema:
          type: string
          example: EUR
      - $ref: '#/components/parameters/app_id'
      - $ref: '#/components/parameters/prettyprint'
      responses:
        '200':
          description: Successful conversion result
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ConvertResponse'
              example:
                disclaimer: 'Usage subject to terms: https://openexchangerates.org/terms'
                license: https://openexchangerates.org/license
                request:
                  query: /convert/100/USD/EUR
                  amount: 100
                  from: USD
                  to: EUR
                meta:
                  timestamp: 1686614400
                  rate: 0.924123
                response: 92.4123
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/TooManyRequests'
components:
  responses:
    TooManyRequests:
      description: Too many requests — rate limit or quota exceeded
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    Unauthorized:
      description: Unauthorized — missing or invalid App ID
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    BadRequest:
      description: Bad request — invalid parameters or unavailable data
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  parameters:
    app_id:
      name: app_id
      in: query
      required: true
      description: Your unique App ID for authentication
      schema:
        type: string
        example: your_app_id_here
    prettyprint:
      name: prettyprint
      in: query
      required: false
      description: 'Set to true to enable human-readable (pretty-printed) JSON output for debugging. Defaults to false to minimize response size.

        '
      schema:
        type: boolean
        default: false
  schemas:
    ConvertResponse:
      type: object
      description: Currency conversion response
      properties:
        disclaimer:
          type: string
          description: Legal disclaimer URL
        license:
          type: string
          description: License URL
        request:
          type: object
          description: Details of the conversion request
          properties:
            query:
              type: string
              description: The request path
            amount:
              type: number
              description: The amount that was converted
            from:
              type: string
              description: Source currency code
            to:
              type: string
              description: Target currency code
        meta:
          type: object
          description: Metadata about the conversion
          properties:
            timestamp:
              type: integer
              description: Unix timestamp of the exchange rate used
            rate:
              type: number
              format: double
              description: Exchange rate used for conversion
        response:
          type: number
          format: double
          description: The converted amount
    ErrorResponse:
      type: object
      description: Standard error response
      properties:
        error:
          type: boolean
          description: Always true for error responses
          example: true
        status:
          type: integer
          description: HTTP status code
          example: 401
        message:
          type: string
          description: Short error identifier
          example: invalid_app_id
        description:
          type: string
          description: Detailed human-readable error explanation
          example: Invalid App ID provided. Please sign up at https://openexchangerates.org/signup, or contact support@openexchangerates.org.
  securitySchemes:
    appId:
      type: apiKey
      in: query
      name: app_id
      description: 'Your unique App ID obtained from openexchangerates.org. Required for all endpoints except /currencies.json.

        '