specification: API Commons Rate Limits
specificationVersion: '0.1'
generated: '2026-07-26'
method: probed
provider: National Association of REALTORS
providerId: nar
api: REALTORS M1 Gateway External API
source: live response headers from https://nar.m1gateway.realtor/ext/Member
sources:
  - https://nar.m1gateway.realtor/ext/Member
description: >-
  NAR publishes no rate-limit documentation for the M1 Gateway External API - neither the Swagger 2.0
  document nor the Postman collection mentions throttling, and no 429 response is declared anywhere. The
  gateway nevertheless advertises a live rate-limit budget in response headers on every request, including
  unauthenticated 401s, which is where these values come from. The header set is the ASP.NET Core
  AspNetCoreRateLimit convention: X-Rate-Limit-Limit carries the window ("600s"), X-Rate-Limit-Remaining
  the calls left in it, and X-Rate-Limit-Reset the ISO-8601 instant the window rolls. Observed twice on
  2026-07-26 with a remaining count of 5999 against a 600-second window, implying a 6,000-request budget
  per 10 minutes on the unauthenticated path; the authenticated per-partner budget is not observable
  without NAR-issued credentials.
documented: false
headers:
  limit: X-Rate-Limit-Limit
  remaining: X-Rate-Limit-Remaining
  reset: X-Rate-Limit-Reset
responseCodes:
  throttled: null
  note: No 429 response is documented in the published Swagger definition.
limits:
  - name: Observed gateway window (unauthenticated probe)
    scope: client
    metric: requests_per_window
    limit: 6000
    timeFrame: 600s
    inferred: true
    evidence: >-
      X-Rate-Limit-Limit 600s with X-Rate-Limit-Remaining 5999 immediately after a single request,
      observed 2026-07-26T22:45Z and 2026-07-27T00:01Z on https://nar.m1gateway.realtor/ext/Member.
observations:
  - date: '2026-07-26'
    url: https://nar.m1gateway.realtor/ext/Member
    status: 401
    headers:
      X-Rate-Limit-Limit: 600s
      X-Rate-Limit-Remaining: '5999'
      X-Rate-Limit-Reset: '2026-07-26T22:45:11Z'
  - date: '2026-07-27'
    url: https://nar.m1gateway.realtor/ext/Member
    status: 401
    headers:
      X-Rate-Limit-Limit: 600s
      X-Rate-Limit-Remaining: '5999'
      X-Rate-Limit-Reset: '2026-07-27T00:11:16.7707553Z'