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: Updox
providerId: updox
created: '2026-07-04'
modified: '2026-07-04'
reconciled: false
tags:
- Healthcare
- Secure Messaging
- Electronic Fax
- Rate Limiting
- Quotas
description: >-
  Updox does not publish fixed numeric per-endpoint rate limits for its public
  IO API. API access is partner-provisioned and governed by an API Acceptable
  Use Policy rather than an open, self-serve quota page. In practice, usage is
  shaped by subscription-tier allowances (monthly caps on faxes, telehealth
  sessions, appointment reminders, and broadcast messages) rather than by a
  documented requests-per-minute ceiling. The FaxOemPop / PopPDF retrieval
  functions are self-throttling by design - they return one fax per call and
  cap repeated redelivery of an unacknowledged fax at 10 retries until
  lastRetrievedFaxId is supplied.
notes: >-
  No public throttling response code or per-minute limit is documented as of the
  review date. Confirm partner-specific limits and the API Acceptable Use Policy
  with Updox during onboarding.
sources:
- https://help.updox.com/help/public-api
- https://help.updox.com/help/api-usage
- https://help.updox.com/help/faxoempop
responseCodes:
  throttled: not published
limits:
- name: IO API Requests
  scope: application
  metric: requests
  limit: not published
  notes: No fixed numeric per-endpoint request-rate limit is documented for the IO API.
- name: Fax Retrieval Redelivery
  scope: account
  metric: retries
  limit: 10 retries per unacknowledged fax
  notes: FaxOemPop/PopPDF re-return the same fax up to 10 times until lastRetrievedFaxId marks it handled.
- name: Subscription Allowances
  scope: account
  metric: messages
  limit: per plan
  notes: Monthly caps on faxes, telehealth sessions, reminders, and broadcast messages are set by the subscription tier, not by an API rate limit.
policies:
- name: Acceptable Use Policy
  description: API usage is governed by Updox's API Acceptable Use Policy, agreed to during partner onboarding.
- name: Fax Acknowledgement
  description: Clients must supply lastRetrievedFaxId on each poll so retrieved faxes are marked handled and the queue advances toward endOfQueue.
- name: Backoff Strategy
  description: Clients should poll on a reasonable interval and implement exponential backoff with jitter on errors.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com