generated: '2026-09-02'
method: searched
source: https://upway.co/llms.txt
name: Upway Rate Limits
description: >-
  Upway documents that its agent commerce endpoint is rate limited and tells agents how
  to react, but publishes no number, window or budget. That is the finding: the runtime
  signal (429 + back off) is stated, the quantity is not, and no RateLimit-* headers
  were present on live responses.
docs: https://upway.co/llms.txt
limit_count: 0
limits:
- scope: per-ip
  surface: https://upway.co/api/ucp/mcp
  window: null
  limit: null
  burst: null
  status_code: 429
  documented: true
  quantified: false
  statement: >-
    "Respect rate limits. The MCP endpoint is rate-limited per IP. Back off on 429
    responses."
  source: https://upway.co/llms.txt
headers:
  standard_ratelimit_headers: false
  observed_on_200: []
  probed:
  - url: https://upway.co/api/ucp/mcp
    method: POST
    status: 200
    ratelimit_headers_present: false
    note: >-
      Response carried shopify-complexity-score 420 and shopify-complexity-score-v2 42,
      plus x-request-id and server-timing. The complexity-score headers report the cost
      of the request against Shopify's internal budget; they are not a published
      RateLimit-* budget, are not documented by Upway, and an agent cannot derive a
      remaining allowance from them.
  - url: https://upway.co/
    method: GET
    status: 200
    ratelimit_headers_present: false
    note: shopify-complexity-score 2740 / v2 274 present; no RateLimit-* headers.
  retry_after_documented: false
  retry_after_observed: false
gaps:
- >-
  No numeric limit, no window and no burst allowance is published, so an agent must
  discover the ceiling by hitting it.
- >-
  No RFC 9331 RateLimit / RateLimit-Policy headers and no Retry-After were observed, so
  a 429 carries no machine-readable back-off hint - the guidance to "back off" is prose
  in llms.txt only.
x-evidence:
  fetched: '2026-09-02'
  urls:
  - url: https://upway.co/llms.txt
    status: 200
  - url: https://upway.co/api/ucp/mcp
    status: 200