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: Change Healthcare
providerId: change-healthcare
generated: '2026-08-15'
method: searched
source: >-
  live probes of every changehealthcare.com property plus the successor Optum developer portal
created: '2026-05-04'
modified: '2026-08-15'
reconciled: true
tags:
- Rate Limiting
- Healthcare
- EDI
limit_count: 0
description: >-
  Change Healthcare publishes no numeric rate limit, no burst allowance and no rate-limit response
  header contract on any property. This file records that verified absence. It replaces a 2026-05-04
  bulk-sweep scaffold that asserted a 429/401 response-code contract and three "policies" (backoff,
  sandbox-vs-production throttling, BAA handling) that the company does not publish in those terms —
  API Evangelist advice credited to the provider, now removed.
notes: >-
  The changehealthcare.com API gateway is retired (see lifecycle/change-healthcare-lifecycle.yml), so
  no live unauthenticated response could be observed carrying rate-limit headers — every path on
  apis.changehealthcare.com answers 400 invalid_request. The successor Optum developer portal
  documents API RESPONSE AND TIMEOUT TIMES for the former Change Healthcare Medical Network APIs, but
  a timeout is not a rate limit: it publishes no requests-per-window ceiling, no X-RateLimit-* or
  RateLimit-* header set, and no documented status code on exhaustion. Throughput is governed by the
  customer's clearinghouse contract and onboarding configuration, which is not public.
response_headers: []
status_on_exhaustion: null
evidence:
- url: https://apis.changehealthcare.com/
  status: 200
  note: 'plain-text "ALB Good!" load-balancer health shell; no API, no headers'
- url: https://apis.changehealthcare.com/openapi.json
  status: 400
  note: '{"error":"invalid_request"} — retired gateway answers this on every path'
- url: https://api.changehealthcare.com/
  status: 0
  note: TCP connect timeout on port 443 on both A records
- url: https://developer.optum.com/eligibilityandclaims/docs/api-urls
  status: 200
  note: endpoint reference for the successor surface; documents no rate limit
limits: []
policies: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com