Frankfurter Currencies API

openapi: 3.1.2
info:
  title: Frankfurter Currencies API
  description: Frankfurter is an open-source API for current and historical foreign exchange rates, sourcing currency data from public providers like the European Central Bank.
  version: 1.0.0
  license:
    name: MIT
    url: https://github.com/lineofflight/frankfurter/blob/main/LICENSE
  contact:
    url: https://github.com/lineofflight/frankfurter/issues
  x-generated-from: upstream
  x-last-validated: '2026-05-29'
servers:
- url: https://api.frankfurter.dev/v1
tags:
- name: Currencies
  description: Supported currency reference data
paths:
  /currency/{code}:
    get:
      operationId: getCurrency
      summary: Frankfurter Get a Single Currency
      description: Returns details for a single currency, including provider information or peg metadata.
      parameters:
      - name: code
        in: path
        required: true
        schema:
          type: string
          example: USD
      responses:
        '200':
          description: Currency details
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CurrencyDetail'
              example:
                iso_code: USD
                iso_numeric: '840'
                name: United States Dollar
                symbol: $
                providers:
                - ECB
                - BOC
                - FED
        '404':
          $ref: '#/components/responses/NotFound'
      tags:
      - Currencies
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
  /currencies:
    get:
      operationId: getCurrencies
      summary: Frankfurter Get Available Currencies
      description: Returns available currencies with their names and date ranges. By default, only active currencies are included.
      parameters:
      - name: scope
        in: query
        description: Set to 'all' to include legacy currencies
        required: false
        schema:
          type: string
          enum:
          - all
      - $ref: '#/components/parameters/providers'
      responses:
        '200':
          description: Available currencies
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Currency'
              example:
              - iso_code: EUR
                iso_numeric: '978'
                name: Euro
                symbol: €
                start_date: '1999-01-04'
                end_date: '2026-03-17'
              - iso_code: USD
                iso_numeric: '840'
                name: United States Dollar
                symbol: $
                start_date: '1999-01-04'
                end_date: '2026-03-17'
      tags:
      - Currencies
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
components:
  responses:
    NotFound:
      description: No data found
      content:
        application/json:
          schema:
            type: object
            properties:
              message:
                type: string
  schemas:
    Currency:
      type: object
      properties:
        iso_code:
          type: string
          description: ISO 4217 currency code
        iso_numeric:
          type:
          - string
          - 'null'
          description: ISO 4217 numeric code
        name:
          type: string
          description: Full currency name
        symbol:
          type:
          - string
          - 'null'
          description: Currency symbol
        start_date:
          type:
          - string
          - 'null'
          format: date
          description: Earliest available date
        end_date:
          type:
          - string
          - 'null'
          format: date
          description: Latest available date
      required:
      - iso_code
      - name
    CurrencyDetail:
      type: object
      properties:
        iso_code:
          type: string
          description: ISO 4217 currency code
        iso_numeric:
          type:
          - string
          - 'null'
          description: ISO 4217 numeric code
        name:
          type: string
          description: Full currency name
        symbol:
          type:
          - string
          - 'null'
          description: Currency symbol
        providers:
          type: array
          items:
            type: string
          description: Provider keys that publish this currency
        peg:
          type: object
          properties:
            base:
              type: string
            rate:
              type: number
            authority:
              type: string
            source:
              type: string
              format: uri
          description: Peg metadata, present only for pegged currencies
      required:
      - iso_code
      - name
  parameters:
    providers:
      name: providers
      in: query
      description: Comma-separated list of data providers to include
      required: false
      schema:
        type: string
        example: ECB,TCMB