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OpenAPI Specification

openapi: 3.2.0
info:
  title: exchangerate.dev Latest API
  description: 'Live indicative foreign-exchange rates for developers. Explicit `source` and `market_session` labels on every response — live intraday (~60s) on trading days for all currencies, with ECB daily fallback in the 144-currency catalog (10296 unique pairs). Free tier: 5,000 calls/month, no card. Live rates 15 minutes delayed. MCP server: https://api.exchangerate.dev/v1/mcp/ · Docs: https://exchangerate.dev/docs'
  contact:
    url: https://exchangerate.dev/docs
  version: '1.0'
tags:
- name: Latest
paths:
  /v1/latest/{path_base}:
    get:
      summary: Latest
      operationId: latest_v1_latest__path_base__get
      parameters:
      - name: path_base
        in: path
        required: true
        schema:
          anyOf:
          - type: string
          - type: 'null'
          title: Path Base
      - name: base
        in: query
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          title: Base
      - name: symbols
        in: query
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          title: Symbols
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/LatestResponse'
        '400':
          description: Bad request. Codes include invalid_pair, unsupported_base, bad_date, invalid_amount, invalid_request, missing_parameter, unsupported_interval, unsupported_pair_interval and unsupported_index_interval.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: 'Authentication failed: invalid_api_key (or invalid_session_token on dashboard routes).'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '403':
          description: 'plan_gated: the caller''s plan does not include this interval or history depth; forbidden: the request did not pass through the public origin.'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: Not found, e.g. unknown_index or no_data_for_date.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '422':
          description: Request validation failed.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '429':
          description: 'Rate limit or quota exceeded: rate_limited (per-minute limit, X-RateLimit-Scope tier-rate-minute), ip_rate_limited (keyless per-IP hourly cap, anon-ip-hour) or quota_exceeded (monthly quota, tier-quota-month). Wait Retry-After seconds; do not retry a monthly quota error automatically. quota_unavailable means the quota store could not be read; retry after Retry-After.'
          headers:
            X-RateLimit-Limit:
              description: Limit for the window named by X-RateLimit-Scope.
              schema:
                type: integer
            X-RateLimit-Remaining:
              description: Requests left in that window (0 on a 429).
              schema:
                type: integer
            X-RateLimit-Reset:
              description: Unix time (seconds) when the window resets.
              schema:
                type: integer
            X-RateLimit-Scope:
              description: 'Which limit applied: anon-ip-hour, tier-rate-minute or tier-quota-month.'
              schema:
                type: string
            Retry-After:
              description: Seconds to wait before retrying.
              schema:
                type: integer
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '500':
          description: The operation failed internally.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '503':
          description: A required data source or feature is temporarily unavailable, e.g. data_unavailable, live_unavailable, source_unavailable or service_unavailable.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      tags:
      - Latest
  /v1/latest:
    get:
      summary: Latest
      operationId: latest_v1_latest_get
      parameters:
      - name: path_base
        in: query
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          title: Path Base
      - name: base
        in: query
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          title: Base
      - name: symbols
        in: query
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          title: Symbols
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/LatestResponse'
        '400':
          description: Bad request. Codes include invalid_pair, unsupported_base, bad_date, invalid_amount, invalid_request, missing_parameter, unsupported_interval, unsupported_pair_interval and unsupported_index_interval.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: 'Authentication failed: invalid_api_key (or invalid_session_token on dashboard routes).'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '403':
          description: 'plan_gated: the caller''s plan does not include this interval or history depth; forbidden: the request did not pass through the public origin.'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: Not found, e.g. unknown_index or no_data_for_date.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '422':
          description: Request validation failed.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '429':
          description: 'Rate limit or quota exceeded: rate_limited (per-minute limit, X-RateLimit-Scope tier-rate-minute), ip_rate_limited (keyless per-IP hourly cap, anon-ip-hour) or quota_exceeded (monthly quota, tier-quota-month). Wait Retry-After seconds; do not retry a monthly quota error automatically. quota_unavailable means the quota store could not be read; retry after Retry-After.'
          headers:
            X-RateLimit-Limit:
              description: Limit for the window named by X-RateLimit-Scope.
              schema:
                type: integer
            X-RateLimit-Remaining:
              description: Requests left in that window (0 on a 429).
              schema:
                type: integer
            X-RateLimit-Reset:
              description: Unix time (seconds) when the window resets.
              schema:
                type: integer
            X-RateLimit-Scope:
              description: 'Which limit applied: anon-ip-hour, tier-rate-minute or tier-quota-month.'
              schema:
                type: string
            Retry-After:
              description: Seconds to wait before retrying.
              schema:
                type: integer
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '500':
          description: The operation failed internally.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '503':
          description: A required data source or feature is temporarily unavailable, e.g. data_unavailable, live_unavailable, source_unavailable or service_unavailable.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      tags:
      - Latest
components:
  schemas:
    MarketSession:
      type: string
      enum:
      - open
      - weekend
      - interbank_closed
      title: MarketSession
      description: 'Computed from a clock, no feed (D9). `interbank_closed` = a known non-weekend closure

        (e.g. an ECB/TARGET2 holiday detected via an empty Tier-C response — INGESTION §4).'
    Source:
      type: string
      enum:
      - live
      - ecb_daily
      - market_daily
      title: Source
      description: 'Public `source` enum — wire contract (D2). NO `cached` value (cache lives in X-Cache).


        `ecb_daily` is the only reference source (October 2026).

        `market_daily` labels the stored daily close of the live market feed, for the currencies with

        no reference fix, in date history and 1d time series; it is never a live rate.'
    ErrorResponse:
      properties:
        result:
          type: string
          title: Result
          default: error
        code:
          type: string
          title: Code
        message:
          type: string
          title: Message
      type: object
      required:
      - code
      - message
      title: ErrorResponse
    LatestResponse:
      properties:
        result:
          type: string
          title: Result
          default: success
        base:
          type: string
          title: Base
        source:
          $ref: '#/components/schemas/Source'
        sources:
          additionalProperties:
            $ref: '#/components/schemas/Source'
          type: object
          title: Sources
        market_session:
          $ref: '#/components/schemas/MarketSession'
        timestamp:
          type: string
          title: Timestamp
        data_updated_at:
          type: string
          title: Data Updated At
        effective_at:
          additionalProperties:
            type: string
          type: object
          title: Effective At
        rates:
          additionalProperties:
            type: number
          type: object
          title: Rates
        stale:
          additionalProperties:
            type: boolean
          type: object
          title: Stale
        derived_symbols:
          items:
            type: string
          type: array
          title: Derived Symbols
        notice:
          type: string
          title: Notice
      type: object
      required:
      - base
      - source
      - sources
      - market_session
      - timestamp
      - data_updated_at
      - effective_at
      - rates
      - stale
      - derived_symbols
      - notice
      title: LatestResponse