Oil Price API Diesel Prices API

openapi: 3.2.0
info:
  title: Oil Price API V1 Diesel Prices API
  version: v1
  description: 'Source-aware oil and energy data API. Check each endpoint''s source timestamp,

    coverage, and freshness fields before using a response in a time-sensitive workflow. ## Authentication


    API-key endpoints use `Authorization: Token YOUR_API_KEY`. Operations that do

    not require an API key explicitly declare an empty security requirement. `/v1/demo/prices` is keyless. ## Rate Limiting


    - Free tier: 50 requests per day

    - Paid tiers have plan-specific monthly quotas. - `402` means the allowance is exhausted: a Free or post-trial caller

    must upgrade, and a paid plan has used its monthly allowance (the body

    carries `MONTHLY_QUOTA_EXCEEDED` and reset metadata, so do not retry before

    the reset). `429` means an active-trial allowance or a rolling rate limit

    (for example the hourly safety limit) is exceeded; retry `429` and transient

    `5xx` responses with bounded backoff. - Website login and signup (`POST /sessions` and `POST /users`) also enforce

    authentication-attempt limits independently of API plan quotas: 3 attempts

    per normalized email address in 5 minutes, and 3 attempts per minute per

    verified visitor IP. Requests without a verified proxy identity retain

    the existing 20 requests/minute IP ceiling. A `429` on these routes means

    wait for `Retry-After` before retrying; upgrading a plan does not remove

    authentication-attempt limits. Futures curves are never refused because a market is closed or a session has

    just reopened. The last available data is served with `metadata.freshness_status`,

    `metadata.stale`, `metadata.latest_data_at` and `metadata.stale_by_minutes`:

    `outside_market_hours` while the venue is closed (weekend, daily break,

    holiday); `awaiting_first_print` for the first 30 minutes of a new session

    while only a valid prior close exists; `degraded` when the market is open and

    the source is behind. None of these is a fresh trade; source timestamps remain

    unchanged. Data older than the 96-hour serving bound is refused with 503. Gasoil reports `metadata.freshness_status: no_recent_trades` when the

    benchmark contract has not traded within 30 minutes but our collector confirmed

    the quote within that window and the curve printed within 90 minutes. The last

    trade is served with its true `latest_data_at` and `stale_by_minutes`, plus

    `source_checked_at` and `curve_latest_trade_at`. Paid monthly-cap responses include `retry_guidance`: immediate retries cannot

    restore quota. When a representative sample supports it, `batching_opportunity`

    describes an estimated lower request rate; batching does not restore an already

    exhausted allowance. It may replace an unnecessary upgrade recommendation. ## Continuous futures coverage


    On `/v1/futures/continuous/brent`, `/v1/futures/continuous/wti` and their

    `/historical` routes, `metadata.history_available_from` is the earliest

    stored public continuous futures source date, falling back to collection

    date for older imports without a source timestamp. It is a date string or

    null when no public observations exist. Coverage metadata is cached for up

    to one hour and does not promise observations or volume on every later date. It describes the archive independently of the request''s date range; account

    depth limits remain in `metadata.history_window` on historical responses. Latest-response `metadata.total_historical_records` counts stored public

    snapshots, including revisions, rather than distinct source dates. Latest

    quotes and their prior-day comparisons exclude private organization rows

    and other price types. Repeated source timestamps select the later collected

    revision; the oldest metadata/response cache formats are no longer used. ## Spread and indicator query parameters


    Spread and indicator endpoints reject unrecognized query parameter names with

    HTTP 400 and `error.code: UNKNOWN_PARAMETERS`, after authentication and access

    checks. The error includes `unrecognized_parameters`, `allowed_parameters`,

    and a `suggestions` map for recognized date-name mistakes; values are not

    echoed.'
  contact:
    name: Oil Price API Support
    email: support@oilpriceapi.com
    url: https://oilpriceapi.com
  license:
    name: Commercial License
    url: https://oilpriceapi.com/terms
servers:
- url: https://api.oilpriceapi.com
  description: Production server
tags:
- name: Diesel Prices
  description: Diesel price datasets and regional views.
paths:
  /v1/diesel-prices:
    get:
      summary: Get regional diesel prices
      operationId: getV1DieselPrices
      tags:
      - Diesel Prices
      description: 'Retrieve diesel prices for US regions including national average, PAD districts, and major states.

        Data sourced from EIA (Energy Information Administration) with weekly updates.


        **FREE TIER** - No additional cost'
      parameters:
      - name: state
        in: query
        required: false
        description: Two-letter US state code (e.g., CA, TX, NY)
        schema:
          type: string
          example: CA
      - name: zip
        in: query
        required: false
        description: US ZIP code
        schema:
          type: string
          example: '94102'
      - name: lat
        in: query
        required: false
        description: Latitude coordinate
        schema:
          type: number
          format: float
          example: 37.7749
      - name: lng
        in: query
        required: false
        description: Longitude coordinate
        schema:
          type: number
          format: float
          example: -122.4194
      security:
      - ApiKeyAuth: []
      responses:
        '200':
          description: Regional diesel price data
          content:
            application/json:
              schema:
                type: object
                properties:
                  status:
                    type: string
                    example: success
                  data:
                    type: object
                    properties:
                      regional_average:
                        type: object
                        properties:
                          price:
                            type: number
                            format: float
                            example: 4.862
                            description: Diesel price per gallon
                          currency:
                            type: string
                            example: USD
                          unit:
                            type: string
                            example: gallon
                          region:
                            type: string
                            example: california
                            description: EIA region name
                          granularity:
                            type: string
                            enum:
                            - national
                            - pad_district
                            - state
                            example: state
                          source:
                            type: string
                            example: EIA
                          updated_at:
                            type: string
                            format: date-time
                          cached:
                            type: boolean
                            example: true
                      location:
                        type: object
                        properties:
                          type:
                            type: string
                            enum:
                            - state
                            - zip_code
                            - coordinates
                            - national
                          state_code:
                            type: string
                            example: CA
        '401':
          description: Unauthorized - Invalid API key
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '500':
          $ref: '#/components/responses/InternalServerError'
components:
  responses:
    InternalServerError:
      description: Unexpected server error. Retry transient failures with bounded backoff and retain the request ID when contacting support.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  schemas:
    ErrorResponse:
      type: object
      properties:
        error:
          type: object
          properties:
            code:
              type: string
              description: Machine-readable error code (e.g. UNAUTHORIZED, NOT_FOUND, INVALID_PARAMETER).
              example: UNAUTHORIZED
            message:
              type: string
              example: 'Missing or invalid API key. Include header: Authorization: Token YOUR_API_KEY'
            status:
              type: integer
              example: 401
            request_id:
              type: string
              example: fa0e389f-ca86-47b2-b167-2b4645a2fb8b
            docs:
              type: string
              example: https://docs.oilpriceapi.com#UNAUTHORIZED
            signup_url:
              type:
              - string
              - 'null'
              example: https://www.oilpriceapi.com/auth/signup
            demo_endpoint:
              type:
              - string
              - 'null'
              example: /v1/demo/prices
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: Authorization
      description: 'API key as: Authorization: Token YOUR_API_KEY'
externalDocs:
  description: OilPriceAPI developer documentation
  url: https://docs.oilpriceapi.com