openapi: 3.1.0
info:
  title: Metals.Dev Account Rates API
  description: Metals.Dev provides a developer-friendly JSON API for spot prices of precious metals, industrial metals, and currency conversion rates. It offers real-time prices from leading authorities including LBMA, LME, MCX, and IBJA, plus 5+ years of historical data.
  version: '1.0'
  contact:
    name: Metals.Dev
    url: https://metals.dev/
  license:
    name: Proprietary
    url: https://metals.dev/terms
servers:
- url: https://api.metals.dev/v1
  description: Production
security:
- apiKey: []
tags:
- name: Rates
  description: Latest and historical metal and currency rates.
paths:
  /latest:
    get:
      summary: Get latest rates
      description: Returns live metal prices and 170+ currency conversion rates with timestamps.
      operationId: getLatest
      tags:
      - Rates
      parameters:
      - name: currency
        in: query
        description: Three-letter currency code. Defaults to USD.
        schema:
          type: string
          default: USD
      - name: unit
        in: query
        description: Unit of measure (toz, g, kg, mt). Defaults to toz for precious metals and mt for industrial.
        schema:
          type: string
      responses:
        '200':
          description: Latest rates.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/LatestResponse'
  /timeseries:
    get:
      summary: Get historical timeseries
      description: Returns daily historical rates. Maximum 30-day range per request.
      operationId: getTimeseries
      tags:
      - Rates
      parameters:
      - name: start_date
        in: query
        required: true
        schema:
          type: string
          format: date
      - name: end_date
        in: query
        required: true
        schema:
          type: string
          format: date
      responses:
        '200':
          description: Historical timeseries.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TimeseriesResponse'
components:
  schemas:
    BaseResponse:
      type: object
      properties:
        status:
          type: string
        currency:
          type: string
        unit:
          type: string
        timestamp:
          type: string
          format: date-time
        error_code:
          type: integer
        error_message:
          type: string
    TimeseriesResponse:
      allOf:
      - $ref: '#/components/schemas/BaseResponse'
      - type: object
        properties:
          start_date:
            type: string
            format: date
          end_date:
            type: string
            format: date
          rates:
            type: object
            additionalProperties:
              type: object
    LatestResponse:
      allOf:
      - $ref: '#/components/schemas/BaseResponse'
      - type: object
        properties:
          metals:
            type: object
            additionalProperties:
              type: number
          currencies:
            type: object
            additionalProperties:
              type: number
  securitySchemes:
    apiKey:
      type: apiKey
      in: query
      name: api_key