---
specification: API Commons Rate Limits
specificationVersion: '0.1'
schema: https://raw.githubusercontent.com/api-evangelist/interface-research/main/schema/api-commons.yml#/$defs/RateLimits
provider: CodePen
providerId: codepen
created: '2026-06-12'
modified: '2026-06-12'
reconciled: true
tags:
  - Rate Limiting
description: CodePen does not publicly document rate limits for its oEmbed or Embed APIs; no authentication is required for the oEmbed and POST to Prefill endpoints, and no explicit throttling thresholds have been published.
sources:
  - https://blog.codepen.io/documentation/oembed/
  - https://blog.codepen.io/documentation/embedded-pens/
  - https://blog.codepen.io/documentation/prefill/
headers:
  retryAfter: Retry-After
responseCodes:
  throttled: 429
limits:
  - name: oEmbed API
    scope: ip
    metric: requests_per_minute
    limit: -1
    timeFrame: minute
    notes: No rate limit is publicly documented for the oEmbed endpoint.

  - name: Embed Script (CDN)
    scope: ip
    metric: requests_per_minute
    limit: -1
    timeFrame: minute
    notes: The embed script (public.codepenassets.com) is served via CDN with no published throttling policy.

  - name: POST to Prefill
    scope: ip
    metric: requests_per_minute
    limit: -1
    timeFrame: minute
    notes: No rate limit is publicly documented; endpoint is unauthenticated.