specification: API Commons Plans
specificationVersion: '0.1'
schema: https://raw.githubusercontent.com/api-evangelist/interface-research/main/schema/api-commons.yml#/$defs/Plans
provider: Environmental Protection Agency
providerId: environmental-protection-agency
generated: '2026-09-06'
method: searched
source: >-
  https://www.epa.gov/power-sector/cam-api-portal, https://api.data.gov/signup/,
  https://aqs.epa.gov/aqsweb/documents/data_api.html,
  https://www.epa.gov/enviro/envirofacts-data-service-api
created: '2026-05-04'
modified: '2026-09-06'
tags:
  - Environment
  - Federal Government
  - Air Quality
  - Open Data
description: >-
  EPA publishes no priced plans. Every API in this record is a U.S. federal public-data service
  offered at no charge, with no billing surface, no paid tier, no metered overage and no contract.
  There is nothing to buy and no sales gate — the only differentiator between "tiers" is whether a
  key is required, and a key is free and self-service where one is needed. plan_count is 0 because
  no priced plan exists, not because the pricing page could not be found; EPA has no pricing page,
  and for a federal agency publishing public environmental data that is the correct end state.
plan_count: 0
currency: USD
billing: none
free_tier: true
access_tiers:
  - name: Anonymous — no registration
    price: 0
    apis:
      - EPA Envirofacts Data Service API
      - EPA UV Index API
      - EPA ECHO Compliance and Enforcement API
    quota: >-
      No published request quota. Envirofacts enforces a 15-minute per-request execution timeout;
      ECHO publishes no limit.
    signup: null
    source: https://www.epa.gov/enviro/envirofacts-data-service-api
  - name: Free registered key — AQS Data Mart
    price: 0
    apis:
      - EPA Air Quality System (AQS) API
    quota: >-
      10 requests per minute, 1,000,000 rows per query, 5 parameter codes per request, begin and end
      dates within the same calendar year.
    signup: https://aqs.epa.gov/data/api/signup
    source: https://aqs.epa.gov/aqsweb/documents/data_api.html
    note: >-
      Self-service. The key is emailed to the address supplied; email + key are then passed as query
      parameters on every request.
  - name: Free registered key — Clean Air Markets (EASEY)
    price: 0
    apis:
      - EPA Clean Air Markets (EASEY) APIs
    quota: 1,000 requests per hour by default; 500 rows per page; 15-minute per-request timeout.
    signup: https://api.data.gov/signup/
    source: https://www.epa.gov/power-sector/cam-api-portal
    note: >-
      Issued through the government-wide api.data.gov key service and passed as the x-api-key
      header. EPA states higher limits are available on request via the CAM API contact form —
      by conversation, not by purchase.
plans: []