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: IEX Cloud
providerId: iex-cloud
created: '2026-05-08'
# Provenance stamped 2026-08-11: this artifact was written by the API Evangelist
# bulk sweep dated 2026-05-08, not harvested from the provider. See roadmap#35.
method: generated
modified: '2026-05-08'
reconciled: true
tags:
  - Fintech
  - Market Data
  - Sunset
  - Rate Limiting
description: >-
  IEX Cloud sunset on 2024-08-31. Historically the platform did not enforce per-second request
  caps; instead each endpoint cost a number of "messages" against the monthly message allowance.
  Documented hard limits included a connection cap of 50 concurrent requests and 100 messages per
  second per token on the free tier. Information preserved for migration reference.
sources:
  - https://web.archive.org/web/2024*/iexcloud.io/docs/api/
  - https://iexcloud.io/community/blog/iex-cloud-end-of-life-announcement
responseCodes:
  throttled: 429
limits:
  - name: Concurrent requests (sunset)
    scope: token
    metric: concurrent_connections
    limit: 50
  - name: Per-second cap (Launch, sunset)
    scope: token
    metric: requests_per_second
    limit: 100
  - name: Monthly message allowance
    scope: account
    metric: messages_per_month
    limit: -1
    notes: See plan tier; usage was metered as messages per endpoint call, not request count.
policies:
  - name: Sunset
    description: Service end-of-life on 2024-08-31; rate limits no longer enforced because endpoints unreachable.
maintainers:
  - FN: Kin Lane
    email: kin@apievangelist.com